Construction Glossary

468 construction terms in plain language, A to Z, each with a cited source. Click any term for its own page.

# A B C D E F G H I J K L M N O P Q R S T U V W Z

Core terms 89
Mechanicals 128
Windows & doors 96
Exterior 82
Flooring 73

#

240-Volt Circuit Mechanicals

A higher-voltage circuit for ranges, dryers, EV chargers, and heat pumps. Adding one often needs panel space and a dedicated run.

A

ABS / PVC DWV Pipe Mechanicals

The black (ABS) or white (PVC) plastic pipe used for modern drain and vent lines. Local code dictates which is allowed.

AC Rating Flooring

An abrasion-class scale (AC1–AC5) rating laminate durability for residential vs. commercial traffic. Match the rating to the room's use.

Acclimation Flooring

Letting flooring sit in the installed environment to reach equilibrium moisture before installation, preventing later gapping, cupping, or buckling.

See also: NWFA — Technical Standards

ADA Door Clearance Windows & doors

Accessibility requirements for door width (32 in. clear minimum), maneuvering space, threshold height, and lever (not knob) hardware.

AFCI Mechanicals

Arc-Fault Circuit Interrupter — detects dangerous arcing that can start fires. Code now requires it on most living-space circuits; remodels must add it.

AFUE Mechanicals

Annual Fuel Utilization Efficiency — the percent of fuel a furnace converts to usable heat over a year. 80% is mid-efficiency; 90–98% is condensing/high-efficiency.

Air Admittance Valve (AAV) Mechanicals

A one-way vent valve allowing air in without a roof penetration, useful for islands and additions where running a vent is impractical (where code permits).

Air Handler Mechanicals

The blower unit moving air across the coil and through the ducts, paired with a heat pump or as part of an electric/hydronic system.

Air Leakage (AL) Windows & doors

The rate of air infiltration through a window assembly; lower is tighter and more efficient.

Allowance Core terms

A budgeted dollar figure placeholder in the contract for an item not yet selected (e.g., tile, fixtures). If your final selection costs more than the allowance, you pay the difference — scrutinize low allowances in bids.

Aluminum Branch Wiring Mechanicals

1960s–70s aluminum branch circuits prone to connection overheating. Requires approved remediation (e.g., COPALUM/AlumiConn) for safety.

See also: InterNACHI — Aluminum Wiring

Aluminum Window Windows & doors

A strong, slim-profile metal-framed window; without a thermal break it conducts heat and is less efficient, so used mainly in warm climates or commercial work.

Amperage / Service Size Mechanicals

The home's total electrical capacity (commonly 100A, 150A, 200A). Kitchens, EV chargers, and heat pumps often force a 200A upgrade.

Anode Rod Mechanicals

A sacrificial rod inside a tank water heater that corrodes instead of the tank. Replacing it periodically greatly extends heater life.

Apprentice Core terms

A trade worker learning a craft through a structured program of paid on-the-job training and classroom instruction under journeymen, the standard path into the skilled trades.

See also: U.S. DOL — Apprenticeship.gov

Apron Windows & doors

The trim piece applied to the wall beneath the interior window sill (stool), finishing the assembly.

Arc Flash / Lockout Mechanicals

Safety practices (de-energizing, lockout/tagout, PPE) for working on electrical systems. Why panel and service work is licensed, permitted trade work.

Architect of Record Core terms

The licensed architect legally responsible for the design documents submitted for permit, certifying the design meets applicable codes and standards.

Argon / Krypton Fill Windows & doors

Inert gas sealed between glass panes; denser than air, it slows heat transfer. Krypton outperforms argon in thinner triple-pane cavities.

As-Built Drawings Core terms

Updated drawings that reflect the project exactly as constructed, including all field changes — invaluable for future remodels and locating concealed utilities.

Astragal Windows & doors

The vertical molding/seal where a pair of doors meets, closing the gap and providing a stop and weather seal.

Awning Window Windows & doors

A window hinged at the top that swings out from the bottom, shedding rain so it can stay open in light weather. Often used high on walls or above other windows.

B

Back-Priming / Sealing Exterior

Priming all faces and cut ends of wood/fiber-cement siding and trim before install so moisture can't enter the unsealed back and cause failure.

Backdrafting Mechanicals

Combustion gases (including CO) being pulled back into the house instead of up the flue, often from negative pressure caused by exhaust fans.

Backer Board Flooring

A rigid cement or fiber-cement panel providing a stable, water-durable base for floor tile over a wood subfloor.

Backer Rod & Sealant Windows & doors

A foam rod set in the perimeter gap before exterior sealant, sizing the joint so the sealant performs and lasts.

Backflow Preventer Mechanicals

A device stopping contaminated water from being siphoned back into the potable supply. Code-required at hose bibs, irrigation, and boilers.

Backwater Valve Mechanicals

A check valve in the building drain preventing municipal sewer backups from flooding the home. A recommended add in basement remodels.

Balancer Windows & doors

The spring or counterweight mechanism in a hung window that holds the sash open at any height. A common failure point in older windows.

Baluster / Spindle Exterior

The vertical infill members of a railing. Spacing must reject a 4-inch sphere to meet code.

Bamboo Flooring Flooring

A grass-based floor; strand-woven bamboo is very hard and durable. Quality and formaldehyde emissions vary widely by manufacturer.

Barn Door Windows & doors

A surface-mounted sliding door on an exposed track, a design-driven space saver that does not seal or soundproof like a swing door.

Baseboard / Shoe Molding Flooring

Trim at the wall base; quarter-round or shoe molding covers the flooring expansion gap and minor floor irregularities.

Bay Window Windows & doors

A multi-panel window assembly that projects outward from the wall in an angled bay, adding light, view, and interior space.

Beam Core terms

A primary horizontal member that carries loads from joists or framing across a span to posts or walls. Opening up a floor plan usually means adding a sized beam.

Beam Cantilever Exterior

The limited allowable overhang of joists past the beam (and beam past posts). Code caps it as a fraction of the backspan.

Beam Pocket Core terms

The recess in a wall or foundation that receives and bears the end of a beam. Cutting in new beam pockets is part of the cost when opening a load-bearing wall.

See also: Wikipedia — Beam (Structure)

Berber Flooring

A durable looped-pile carpet style. Hides traffic well; snags can run if a loop is cut.

Bid Core terms

A contractor's formal price proposal for a defined scope of work. Always compare multiple bids on the same written scope so you are comparing like for like, not just bottom-line numbers.

Bifold Door Windows & doors

A door of hinged panels that fold against each other, common on closets and as wide multi-panel patio walls.

Blower Door Test Mechanicals

A fan-and-gauge test measuring whole-house air leakage. Code increasingly requires a passing result after major remodels.

Board & Batten Exterior

Wide vertical boards with narrow battens covering the seams — a farmhouse-style vertical siding pattern available in several materials.

Boiler Mechanicals

A heating appliance that heats water for radiators, baseboard, or radiant floors (hydronic heat) rather than blowing warm air.

Bond Core terms

A surety bond is a guarantee from a third party that the contractor will complete the work (performance bond) or pay subs and suppliers (payment bond). Bonding is a sign of contractor financial stability.

Bonding (Pools/Gas/Water) Mechanicals

Tying metallic systems together so they can't carry a dangerous voltage difference. Specific bonding is required for gas piping, water lines, and pools.

Bow Window Windows & doors

A curved projecting window of four or more equal units forming a gentle arc, a softer alternative to the angular bay.

Box Fill Mechanicals

The NEC limit on how many conductors/devices fit in an electrical box. Overfilled boxes overheat and are a common inspection failure.

Branch Circuit Mechanicals

Wiring from a breaker to the outlets/devices it serves. Circuit count and dedicated circuits are core to any kitchen, bath, or addition.

Breaker Board Exterior

A divider board run perpendicular mid-deck so decking doesn't need full-length boards or end butt joints across the field.

Brick Veneer Exterior

A single non-structural brick wythe over a framed wall with an air gap and ties. Durable and low-maintenance; weep holes and flashing are essential.

Buckling Flooring

Flooring lifting off the subfloor, the extreme result of moisture or no expansion gap. Usually requires replacing affected boards and fixing the cause.

See also: NWFA — Technical Standards

Building Code Core terms

The set of minimum legal standards for safe construction adopted by your jurisdiction (in Ohio, based on the International Residential Code). Work must meet code to pass inspection and protect resale.

Building Drain / Sewer Lateral Mechanicals

The main drain leaving the house to the city sewer or septic. Aging clay/cast laterals are a major hidden-cost risk in older homes.

C

Cable Railing Exterior

Horizontal stainless cables as rail infill for a view-through modern look. Cables must be highly tensioned and posts reinforced to keep spacing compliant.

Camera / Scope Inspection Mechanicals

Running a camera down the sewer lateral to find breaks, bellies, or root intrusion before they become an emergency — wise before a major remodel.

Capillary Break Exterior

A gap or coating stopping water from wicking between materials (e.g., between siding and trim or framing and concrete).

Carbon Monoxide (CO) Risk Mechanicals

Colorless toxic gas from incomplete combustion. Cracked exchangers, backdrafting, and bad venting cause it — driving CO-alarm and venting code rules.

Carpenter Core terms

A skilled tradesperson who constructs, installs, and repairs structures and fixtures from wood and other materials — framing, trim, cabinetry, and finish work.

Carpet Pad / Cushion Flooring

The resilient underlayment beneath carpet that extends its life, adds comfort and insulation. Correct density matters more than thickness.

Carpet Pile Flooring

The visible fiber surface of carpet — cut, loop (Berber), or cut-and-loop — which drives look, feel, and wear performance.

Carpet Tile Flooring

Modular carpet squares allowing spot replacement and patterns. Popular in basements and rentals for easy repair.

Casement Window Windows & doors

A window hinged at the side that swings outward via a crank. Seals tightly when closed, giving strong energy performance and full-opening ventilation.

Casing Windows & doors

The decorative trim framing a window or door opening on the interior or exterior, covering the gap between frame and wall.

Cast Iron Drain Mechanicals

Older quiet but corrodible drain piping. Deteriorated cast iron under slabs/in stacks is a common reason for invasive plumbing work.

Caulk Core terms

A flexible sealant used to close gaps and joints against air and water (around trim, tubs, counters). The right caulk for the location matters — kitchen/bath joints need a mildew-resistant silicone.

Cement Board Core terms

A rigid cement-based panel used as a stable, water-durable substrate for tile in wet areas — preferred over drywall behind tile in showers and on counters.

Central Air Conditioner Mechanicals

A split system with an outdoor condenser and indoor coil that cools the whole house through the existing ductwork.

Ceramic Tile Flooring

Fired clay tile with a glazed surface — economical, water-resistant, and easy to maintain; softer and more porous than porcelain.

Certificate of Occupancy (CO) Core terms

A document issued by the building department certifying a structure complies with code and is safe to occupy. Often required after major remodels and before a property can be legally sold.

Change Order Core terms

A written, signed amendment that adds, removes, or modifies work after the contract is signed, adjusting price and schedule accordingly. Verbal changes are the leading cause of remodel disputes — get every change in writing.

Circuit Breaker Mechanicals

An automatic switch that interrupts a circuit on overload or short, resettable unlike a fuse. The modern overcurrent device.

Clad Window Windows & doors

A wood-interior window with an aluminum or vinyl exterior skin, combining a warm interior with a maintenance-free exterior.

Clapboard / Lap Siding Exterior

Horizontal boards installed overlapping to shed water — the most common siding profile across materials.

Cleanout Mechanicals

A capped access fitting for snaking/clearing the drain line. Code requires them at intervals and direction changes.

Click-Lock Flooring

A tongue-and-groove profile that mechanically snaps planks together for glueless floating installation.

Combustion Air Mechanicals

Outside air a fuel-burning appliance needs to burn safely. Tightening a house without providing it can cause backdrafting and CO risk.

Combustion Air Code Mechanicals

Requirements ensuring fuel appliances get enough air in confined spaces (e.g., a furnace closet). Tightening the envelope can trigger this.

Combustion Venting (Water Heater) Mechanicals

Atmospheric, power-vent, or direct-vent options for gas water heaters. Switching types during a remodel affects venting and combustion-air work.

Compliance Core terms

Meeting all applicable codes, permit conditions, and regulations for the work performed. Documented compliance is what protects you at resale and with insurers.

See also: Merriam-Webster — Compliance

Composite Decking Exterior

Boards of wood fiber and plastic — low-maintenance, no staining, longer warranty, higher upfront cost than wood. The dominant modern decking.

Concrete Core terms

A mix of cement, aggregate, and water that cures into a hard structural material used for footings, slabs, and foundations. Curing time affects schedule on any structural work.

Condensate Drain Mechanicals

The line removing water the AC coil pulls from the air. Clogs cause overflow and water damage; a safety float switch is recommended.

Condensation Resistance Windows & doors

An NFRC-rated measure (0–100) of a window's ability to resist interior surface condensation; higher is better.

Condenser Mechanicals

The outdoor unit that rejects heat removed from the house. Needs clearance and airflow; undersizing or dirty coils kill efficiency.

Condensing Furnace Mechanicals

A high-efficiency (90%+ AFUE) furnace that extracts extra heat from exhaust, producing acidic condensate that needs a drain and PVC venting.

Conduit Mechanicals

Protective tubing (EMT, PVC) for wiring in exposed, exterior, or damp locations and where code requires physical protection.

Contingency Budget Core terms

A reserve (typically 10–15% of project cost) set aside for hidden conditions and surprises uncovered once work begins. The line clients most want to skip and most often need.

Continuous Exterior Insulation Exterior

Rigid foam over the sheathing, under the siding, that breaks thermal bridging through studs. Increasingly code-relevant and added during re-siding.

Contract Core terms

The legally binding agreement between owner and contractor that defines scope, price, schedule, and responsibilities. A remodel should never start on a handshake — the contract is your primary protection.

Contract Documents Core terms

The full set of papers that together form the agreement — the signed contract, drawings, specifications, scope of work, allowances, and any addenda. All of it governs the job, not just the signature page.

Copper Pipe Mechanicals

Durable, long-proven supply piping (types L/M). More costly and labor-intensive than PEX; still specified where preferred or required.

Cork Flooring Flooring

A renewable floor from cork bark — soft, warm, and sound-absorbing, but dents and needs sealing and humidity control.

Corner Post Exterior

Trim at outside (and inside) wall corners that receives and finishes siding ends for a weather-tight, clean corner.

Cost-Plus vs. Fixed-Price Core terms

Two contract structures: fixed-price (lump sum, contractor bears overrun risk) versus cost-plus (owner pays actual costs plus a fee, owner bears overrun risk). Each shifts risk and pricing transparency differently.

Course Exterior

One horizontal row of siding running the length of the wall. Courses are kept level and to consistent exposure for a straight appearance.

CPVC Mechanicals

Chlorinated PVC supply pipe rated for hot and cold water; an alternative to copper/PEX in some regions.

Crawl Space Core terms

A shallow accessible void below the floor (instead of a basement or slab) housing structure, plumbing, and ducts. Its condition affects access cost and moisture risk on remodels.

Crowning Flooring

Board centers higher than edges, often from sanding a still-damp cupped floor too soon. Reversing it requires correcting moisture and re-sanding later.

See also: NWFA — Technical Standards

Cupping Flooring

Board edges rising higher than centers from a moisture imbalance (wetter underside). A symptom of a moisture problem, not just a finish defect.

See also: NWFA — Technical Standards

D

Damper Mechanicals

An adjustable plate in a duct that balances or shuts off airflow to a zone or branch.

See also: ASHRAE — Terminology: Damper

Deadbolt Windows & doors

A lock bolt thrown by a key or thumbturn (not spring-actuated), the primary security lock on an exterior door. Grade 1 is the highest residential rating.

Debris Container / Dumpster Core terms

The roll-off container for construction waste. Placement, permits for street placement, and haul-away are real line items and logistics on any sizeable remodel.

Deck Beam Exterior

The horizontal member spanning between posts that carries the joists. Size depends on span and the joist load above it.

Deck Fascia Exterior

The trim board covering the outer rim joist for a finished edge, often matching or contrasting the decking.

Deck Footing Exterior

The concrete base below a deck post, sized and dug below the frost line to carry the post load without heaving or settling.

Deck Joist Exterior

The repetitive members spanning ledger to beam that the decking fastens to. Spacing (12–16 in.) depends on decking type and direction.

Deck Post Exterior

A vertical member (typically 6x6) carrying the deck beam down to the footing, secured top and bottom with rated connectors.

Deck Stain / Sealer Exterior

A penetrating or film finish protecting wood decking from UV and moisture; requires periodic reapplication, unlike composite.

Decking Board Exterior

The walking-surface boards fastened across the joists — wood, composite, PVC, or aluminum. The most-visible and most-replaced deck component.

Decking Span Exterior

The maximum joist spacing a given decking can bridge without sagging — varies by material and whether boards run straight or diagonal.

Dedicated Circuit Mechanicals

A circuit serving one appliance only (e.g., range, dryer, microwave, EV charger). Required by code for many large or motor loads.

See also: ESFI — Appliance Safety Tips

Dehumidifier (Whole-House) Mechanicals

A ducted unit removing humidity in muggy climates/basements for comfort and mold control beyond what AC alone provides.

Demolition Core terms

The controlled removal of existing finishes and structure to prepare for new work. A clean, properly contained demo is where most hidden conditions (rot, old wiring, mold) are first uncovered.

Design Pressure (DP) Windows & doors

A rating of how much wind load a window can withstand. Higher DP is required in high-wind and coastal zones.

Design-Build Core terms

A delivery method where one entity handles both design and construction under a single contract, giving the owner one point of responsibility and tighter cost/design feedback.

Dimmer Switch Mechanicals

A control varying light level. Must be compatible with the bulb/driver type (LED-rated) to avoid flicker and buzz.

Door Closer Windows & doors

A device that controls a door's closing speed and ensures it latches, common on garage-to-house fire-rated doors.

Door Jamb Windows & doors

The frame the door is mounted in — two side jambs and a head jamb. Must be plumb and square for the door to operate and seal.

Door Sweep Windows & doors

A seal along the bottom edge of a door that closes the gap to the threshold against drafts, water, and pests.

Double-Hung Window Windows & doors

A window with two operable sashes that both slide vertically and usually tilt in for cleaning. The most common residential window in older U.S. homes.

Double-Pane / Double-Glazed Windows & doors

A two-pane insulated glass unit, the modern baseline for energy-efficient windows.

Downspout Exterior

The vertical pipe carrying gutter water down and away from the foundation. Extensions or buried drains move it far enough out to matter.

Drain-Waste-Vent (DWV) Mechanicals

The system carrying waste out and venting the drains so traps hold their seal. The hardest part to relocate in a remodel.

Drainage Plane Exterior

The continuous surface (the WRB and its flashings) designed to carry any water that gets behind the cladding safely back out.

Draw Schedule Core terms

The agreed timeline of payments tied to completed project milestones rather than calendar dates. A fair draw schedule keeps payments slightly behind the work completed, never ahead of it.

Drawing Set Core terms

The coordinated package of plans — floor plans, elevations, sections, and details — that defines the design and governs construction and permitting.

Drip Edge Exterior

Metal flashing at roof eaves and rakes that directs water into the gutter and keeps it off the fascia and sheathing.

Drywall Core terms

Gypsum panel wall and ceiling material (also called sheetrock) that is hung, taped, mudded, and finished. Any wall opened during a remodel needs drywall repair and finish.

Dual-Fuel / Hybrid System Mechanicals

A heat pump paired with a gas furnace that switches to gas in extreme cold for the most cost-effective heating across the season.

Duct Sealing Mechanicals

Mastic/foil-tape sealing of duct joints to stop leakage (often 20–30% of conditioned air). One of the highest-ROI efficiency improvements.

Ductless Mini-Split Mechanicals

A heat pump with an outdoor unit and wall/ceiling indoor heads, no ductwork. Ideal for additions, conversions, and zoning specific rooms.

Ductwork Mechanicals

The supply/return passages distributing conditioned air. Leaky or undersized ducts are a top cause of comfort and efficiency complaints.

Dust Containment Core terms

Temporary barriers, zip walls, and negative-air setups that keep demolition and sanding dust out of occupied areas. Standard practice for live-in remodels and required where lead is present.

Dutch Door Windows & doors

A door split horizontally so the top and bottom open independently.

E

Easement Core terms

A recorded legal right for someone else (often a utility) to use part of your land. Building over an easement can force removal at your expense — check the survey before adding structures.

Egress Core terms

A code-required path of exit from a space in an emergency. Bedrooms and finished basements require a compliant egress window or door of minimum size and reachable height.

Egress Code Requirement Windows & doors

IRC minimums for an emergency escape opening — clear width, height, area (about 5.7 sq ft), and max sill height — that govern bedroom/basement windows.

Egress Window Windows & doors

A window meeting code minimum size and sill height to serve as an emergency exit, required for bedrooms and finished basements.

EIFS Exterior

Exterior Insulation and Finish System — a foam-and-synthetic-stucco cladding. Energy-efficient but notorious for moisture failures if not drainable and detailed correctly.

Electric Resistance Heat Mechanicals

Baseboard, wall, or furnace strip heat that converts electricity directly to heat. 100% efficient at the unit but expensive to run versus a heat pump.

Electrician Core terms

A licensed tradesperson who installs and maintains wiring, panels, circuits, and devices to code. Remodels that add circuits or move panels require a licensed electrician and inspection.

Electrification / Heat-Pump Retrofit Mechanicals

Replacing fossil-fuel HVAC/water heating with heat pumps. Often paired with a panel/service upgrade and may qualify for IRA tax credits and rebates.

Elevation Core terms

A flat, straight-on drawing of one face of a structure or wall (e.g., a kitchen wall elevation) showing heights and vertical relationships that a plan view cannot.

Energy Audit Mechanicals

A professional assessment (often with a blower door) identifying the highest-ROI efficiency improvements before a mechanical remodel.

ENERGY STAR (Windows) Windows & doors

The EPA program certifying windows that meet regional efficiency criteria; the simplest shortcut to a climate-appropriate efficient window.

Engineered Hardwood Flooring

A real-wood wear layer over a cross-ply core for dimensional stability. Handles humidity and below-grade better than solid; refinishing is limited by wear-layer thickness.

See also: NWFA — Types of Wood Floors

Engineered Wood Siding Exterior

Treated wood-strand siding (e.g., LP SmartSide) — lighter and more impact-tough than fiber-cement with a real-wood look; needs proper edge sealing.

Epoxy Floor Flooring

A seamless resinous coating over concrete, common in garages and basements for chemical and abrasion resistance.

ERV / HRV Mechanicals

Energy/Heat Recovery Ventilators that supply fresh air while recovering heat (and, for ERV, humidity) from exhaust. Key for tight, healthy homes.

Evaporator Coil Mechanicals

The indoor coil (usually atop the furnace) where refrigerant absorbs heat from house air. Paired and matched to the condenser.

Excavation Core terms

Earth removal for foundations, footings, or utilities. Regulated for cave-in safety and requires utility locating before digging.

Expansion Gap Flooring

The deliberate space left at walls and fixed objects so wood/laminate/vinyl can expand and contract without buckling. Hidden by baseboard or trim.

See also: NWFA — Technical Standards

Expansion Tank Mechanicals

A small tank absorbing thermal expansion on a closed system (with a backflow preventer/PRV). Code-required in many areas to protect the heater and plumbing.

Exposure / Reveal Exterior

The face height of siding left visible after the overlap. Consistent exposure is the mark of a quality installation.

Exterior Caulk Joint Exterior

Sealant at trim-to-siding and penetration joints. The wrong joints (e.g., siding butt-to-trim where it should drain) trap water — caulking is detail-specific.

Exterior Paint System Exterior

The primer-plus-topcoat regimen matched to the substrate. Proper prep and product selection determine whether siding holds paint 5 or 15 years.

F

Face Weight Flooring

Ounces of pile fiber per square yard — a rough density/quality indicator when comparing similar carpet constructions.

Fascia Exterior

The vertical band at the roof edge that caps the rafter/truss tails and carries the gutter. A common rot repair tied to gutter failure.

Feeder Mechanicals

The conductors carrying power from the main panel to a subpanel or large appliance disconnect.

Fiber-Cement Siding Exterior

A cement/cellulose composite (e.g., Hardie) — durable, fire- and rot-resistant, paint-holding. Heavier and costlier to install than vinyl; a top resale performer.

Fiberglass Entry Door Windows & doors

An exterior door with a fiberglass skin over an insulated core — dent- and rot-resistant, can mimic wood grain, low maintenance.

Fiberglass Window Windows & doors

A pultruded-fiberglass frame that is strong, stable across temperature swings, and paintable. A premium, durable alternative to vinyl.

Finish Schedule Core terms

A table in the drawings specifying the exact finish for every surface in every room — flooring, wall, ceiling, trim — so selections are documented, not assumed.

Fire-Rated Door Windows & doors

A door assembly tested to resist fire for a set time, code-required between an attached garage and the living space and in certain other locations.

First-Hour Rating / GPM Mechanicals

How much hot water a heater delivers in a peak hour (tank) or gallons-per-minute (tankless). The right sizing metric, not just tank gallons.

Flashing Core terms

Thin water-resistant material installed at joints and transitions (roof-to-wall, around windows and penetrations) to direct water away and prevent leaks into the assembly.

Flashing Tape Windows & doors

Self-adhered membrane lapped around a window opening in shingle fashion to drain incidental water out and away. The make-or-break of a leak-free install.

Floating Floor Flooring

Planks that lock to each other but not to the subfloor, resting on underlayment. Standard for laminate and most rigid vinyl; fast and forgiving.

Floor Emissions (CARB/TSCA) Flooring

Formaldehyde-emission limits for composite-wood floors set by CARB and EPA TSCA Title VI. Compliant-labeled products protect indoor air quality.

Floor Flatness Flooring

Tolerance of the substrate's deviation over a span. Large-format tile and rigid plank demand a flatter floor than older finishes did.

Floor Plan Core terms

A scaled overhead view of a level showing walls, rooms, openings, and fixture locations. The primary drawing for understanding layout and flow.

Flue / Venting Mechanicals

The pipe carrying combustion gases safely outside. Improper sizing, slope, or material is a serious carbon-monoxide hazard.

Flush Door Windows & doors

A door with flat, smooth faces and no panel detail — the minimalist/modern and economical interior style.

Footing Core terms

The widened concrete base below a foundation wall or post that spreads the structure's load over enough soil to prevent settling. New structural posts require their own footings.

Foreman Core terms

The lead worker who directs a specific crew or trade on site, working alongside the team while ensuring the work meets plan and schedule.

Foundation Core terms

The structure (slab, crawl space, or basement) that transfers the building's load to the ground. Foundation condition underlies the feasibility and cost of major remodels.

Framing Core terms

The skeleton of wood or steel members — studs, joists, rafters, beams — that gives a structure its shape and carries its loads before finishes go on.

French Doors Windows & doors

A pair of hinged glazed doors that meet at the center, used for patios and room openings. Wide opening but needs swing clearance.

Frieze Board Exterior

The trim board at the top of the siding where the wall meets the soffit, finishing the top course.

Frost Footing (Deck) Exterior

A deck footing extended below the local frost line so seasonal ground freezing cannot heave the deck.

Fuel Conversion Mechanicals

Switching an appliance/home between gas, propane, and electric. Affects venting, gas sizing, electrical service, and rebate eligibility.

Full-Frame Replacement Windows & doors

Removing the entire old window down to the rough opening and installing a new complete unit. More invasive and costly but corrects rot and lets you resize.

Furnace Mechanicals

A forced-air heater burning gas/oil or using electric elements, distributing heat through ductwork. The most common U.S. central heating system.

Furring Core terms

Thin strips fastened to a wall or ceiling to create a level, plumb nailing surface or an air gap before finish material is applied — common over masonry or uneven framing.

Furring Strip (Rainscreen) Exterior

Vertical strips creating the rainscreen gap and a fastening plane for siding while keeping it off the WRB.

G

Galvanized Pipe Mechanicals

Old zinc-coated steel supply pipe that corrodes and restricts flow internally. A common reason older homes need a repipe.

Galvanized vs. Stainless Hardware Exterior

Corrosion-resistant fastener choices for treated lumber. Modern treated wood is corrosive — using under-rated hardware causes premature connection failure.

Gapping Flooring

Seasonal spaces opening between boards when wood loses moisture in dry months. Some movement is normal; excessive gapping signals humidity-control issues.

See also: NWFA — Technical Standards

Garage Door Windows & doors

A large sectional or one-piece door closing the garage opening, typically with a powered opener. A major exterior weather and security element.

Garden Window Windows & doors

A small projecting box window, often over a kitchen sink, with glass on multiple sides and a shelf for plants.

Gas Line / CSST Mechanicals

Fuel gas piping (black iron or flexible CSST). Adding a range, pro cooktop, tankless heater, or fireplace often requires sizing/extending it.

Gas Meter / Capacity Mechanicals

The utility meter and supply sized to total appliance demand. High-BTU additions can exceed capacity and require a utility upgrade.

General Contractor (GC) Core terms

The party responsible for the overall project — scheduling, hiring and managing subcontractors, pulling permits, and delivering the finished job. Your single point of accountability.

Geothermal Heat Pump Mechanicals

A ground-source heat pump exchanging heat with stable earth temperatures via buried loops — very efficient, high install cost.

GFCI Mechanicals

Ground-Fault Circuit Interrupter — cuts power on a small leakage current near water. Code-required at kitchens, baths, garages, exteriors, and more.

Glazing Windows & doors

The glass component of a window and the process of installing it. 'Single/double/triple glazing' refers to the number of glass panes.

Glue-Down Flooring

Bonding flooring directly to the substrate with adhesive — used for engineered wood and tile over concrete where nailing isn't possible.

See also: NWFA — Technical Standards

Grade (Wood Flooring) Flooring

NWFA appearance classifications (Clear, Select, #1/#2 Common) based on color variation, knots, and character — a look-and-cost choice, not a strength rating.

See also: NWFA — Technical Standards

Grading Core terms

Shaping the ground around a structure so water drains away from the foundation. Poor grading is a leading cause of basement and crawl-space water problems.

Grounding & Bonding Mechanicals

The system tying metal parts and the neutral to earth so faults trip breakers safely. Improper bonding is a shock and fire hazard.

Grounding Electrode Mechanicals

The ground rod(s) or rebar/water-pipe connection establishing the earth reference for the electrical system.

Grout Core terms

The material that fills and seals joints between tiles. Sanded, unsanded, and epoxy grouts differ in durability and stain resistance — epoxy is the premium choice in wet, high-use areas.

Grout Joint Flooring

The spaced gap between tiles filled with grout. Joint width and grout color significantly change the finished look and maintenance.

Guardrail Exterior

The code-required barrier on decks above a set height (commonly 30 in.), with height and infill spacing (4 in. sphere rule) set by code.

Gutter Exterior

The channel at the roof edge collecting runoff. Sizing and slope to downspouts protect the fascia, siding, and foundation from water.

Gutter Guard Exterior

A screen or cover reducing debris in gutters. Effectiveness varies widely by type; none are fully maintenance-free.

H

Handing Windows & doors

The designation of which way a door swings and which side the hinges are on (left/right, in/out). Critical to order the correct prehung unit.

Handleset Windows & doors

The combined exterior grip/handle and (often) deadbolt assembly on an entry door, a major curb-appeal hardware element.

Hard Costs Core terms

The tangible construction costs — labor, materials, equipment — as opposed to soft costs like design fees, permits, and financing. Hard costs are the bulk of a remodel budget.

Hazard Core terms

A condition or activity with potential to cause harm — electrical, structural, dust, fall, or material (lead, asbestos). Identifying hazards before demo drives containment and cost.

Head Windows & doors

The horizontal top member of a window or door frame, below the structural header.

Header Core terms

A horizontal structural member spanning the top of an opening (door, window, cased opening) that transfers the load above around the opening to the supports on each side.

Heat Exchanger Mechanicals

The furnace component that transfers combustion heat to household air while keeping flue gases separate. A cracked heat exchanger is a carbon-monoxide hazard requiring replacement.

Heat Pump Mechanicals

An electric system that moves heat instead of burning fuel, providing both heating and cooling. Highly efficient; cold-climate models now perform well in winter.

Heat-Pump Water Heater Mechanicals

A hybrid tank that pulls heat from surrounding air — 2–3x more efficient than electric resistance. Needs space and produces cool exhaust air.

Helical Deck Pile Exterior

A screw-in steel pile used instead of poured footings, ideal where digging is hard or fast installation is needed.

Herringbone / Chevron Flooring

Two angled-plank layouts: herringbone uses rectangular blocks offset 90°; chevron cuts board ends to meet in a continuous V. Both add significant labor.

Hidden Fastener Exterior

A clip or grooved-edge system securing decking from the side for a screw-free top surface. Standard with composite/PVC grooved boards.

Hinge (Door) Windows & doors

The pivoting hardware carrying the door's weight; ball-bearing hinges are specified for heavy or high-use doors.

Hollow-Core Door Windows & doors

A lightweight interior door with a cardboard-honeycomb core. The economical standard for interior passage doors; poor sound control.

Hopper Window Windows & doors

A window hinged at the bottom that tilts inward from the top. Common in basements for ventilation and egress in some configurations.

Hose Bib / Sillcock Mechanicals

An exterior faucet; frost-free types extend the valve inside the wall to prevent freeze-burst. A common winter failure point.

House Wrap Exterior

A synthetic WRB sheet (e.g., Tyvek) lapped shingle-style and taped, integrated with window/door flashing to keep bulk water out of the wall.

HSPF2 Mechanicals

The current heating-season efficiency rating for heat pumps (replaced HSPF in 2023). Higher means more heat per unit of electricity.

Humidifier (Whole-House) Mechanicals

A unit added to the furnace adding moisture in winter for comfort and to protect woodwork and floors.

Hydronic Heating Mechanicals

Heating that circulates hot water through baseboard, radiators, or floor tubing. Comfortable and quiet; slower to respond than forced air.

I

Impact-Rated Window Windows & doors

A window with laminated glass and reinforced framing tested to resist windborne debris, required in hurricane zones.

Insert / Pocket Replacement Windows & doors

Installing a new window into the existing frame without disturbing trim or siding. Faster and cheaper but slightly reduces glass area.

Inspection Core terms

A code official's review of work at defined stages (rough-in, framing, final) to verify compliance before the next phase can proceed. Failed inspections stop the job until corrected.

Insulated (Foam-Backed) Siding Exterior

Vinyl siding with rigid foam fused to the back, adding a modest R-value and rigidity for a flatter, quieter wall.

Insulated Glass Unit (IGU) Windows & doors

Two or more glass panes sealed with a spacer and gas fill to reduce heat transfer. The standard energy-efficient window glazing.

Insulation Core terms

Material that resists heat flow, rated by R-value, installed in walls, ceilings, and floors. Opened walls are the opportunity to upgrade insulation while it is accessible.

J

J-Channel Exterior

A J-shaped trim receiving siding ends at windows, doors, soffits, and corners, concealing cut edges and managing water.

Jamb Windows & doors

The vertical side members of a window or door frame that the unit is mounted within.

Janka Hardness Flooring

A standardized test of a wood species' resistance to denting and wear. Used to compare durability — e.g., hickory and oak rate higher than walnut or pine.

See also: NWFA — Wood Floor Durability

Joist Core terms

One of the repetitive horizontal members that support a floor or ceiling, spanning between beams or walls. Joist size, spacing, and direction govern what you can cut or load.

Joist Hanger (Deck) Exterior

A galvanized/stainless bracket connecting joists to the ledger and beam. Exterior-rated hangers and the specified nails are mandatory for deck longevity and safety.

Joist Tape Exterior

A self-adhered membrane capping joist tops to keep fastener holes from wicking water — a low-cost step that markedly extends frame life.

Junction Box Mechanicals

An enclosure where wires connect; all splices must be in an accessible box, never buried in a wall. A common code violation in DIY work.

K

Kickout Flashing Exterior

A small diverter where a roof eave meets a wall that kicks runoff into the gutter instead of behind the siding. A missing kickout is a classic hidden-rot cause.

See also: InterNACHI — Kickout Flashing

Knee Wall Core terms

A short wall, typically under a sloped roof or supporting a counter or railing, that is less than full ceiling height.

Knob-and-Tube Wiring Mechanicals

Obsolete early-1900s wiring with no ground. Often must be replaced during remodels and can affect insurance and insulation.

L

Laminate Flooring Flooring

A photographic decor layer over a fiberboard core with a wear overlay. Economical and scratch-resistant but damaged by standing water and not refinishable.

Laminated Glass Windows & doors

Two glass layers bonded to an interlayer that holds shards together when broken — used for security, sound, and impact-rated windows.

Lateral Load Connector Exterior

A tension device tying the deck frame into the house floor framing, code-required to resist the deck pulling away from the building.

Ledger Board Exterior

The deck board bolted to the house that carries one edge of the deck. The single most safety-critical connection — improper ledger attachment causes most deck collapses.

Ledger Flashing Exterior

The Z- or step-flashing that keeps water from getting behind the ledger and rotting the house rim joist. Required and inspected.

Lien Core terms

A legal claim against your property for unpaid work or materials. A mechanic's lien filed by an unpaid subcontractor can cloud your title even if you already paid the general contractor.

Lien Waiver Core terms

A signed document in which a contractor or supplier gives up the right to file a lien for a given payment. Collect lien waivers with each payment to protect against double-payment claims.

Line Set Mechanicals

The insulated copper tubing connecting the outdoor condenser to the indoor coil. Replaced or flushed when changing refrigerant type.

Linoleum Flooring

A resilient floor made from linseed oil and natural fillers (distinct from vinyl). Durable and bio-based; needs periodic sealing and is sensitive to standing water.

Lippage Flooring

Height difference between adjacent tile edges. Excess lippage is a trip hazard and quality defect controlled by flat substrate and leveling clips.

Liquidated Damages Core terms

A pre-agreed dollar amount the contractor owes the owner for each day a project runs past the contracted completion date. Must be a reasonable estimate of actual loss, not a penalty.

Lite Windows & doors

A glass panel within a door (e.g., 'half-lite', 'full-lite', or decorative entry lites).

Load Calculation (Electrical) Mechanicals

An NEC calculation of total demand to verify the service/panel can carry added loads. The basis for whether a service upgrade is required.

Load Calculation Oversizing Mechanicals

Installing equipment larger than the calculated load — a frequent mistake that causes short cycling, poor dehumidification, and higher cost.

Load-Bearing Wall Core terms

A wall that carries weight from the structure above down to the foundation. Removing or opening one requires an engineered beam and posts — never assume a wall is non-bearing.

Low-E Coating Windows & doors

A microscopically thin metallic coating on glass that reflects radiant heat while passing light, sharply improving energy performance.

Luxury Vinyl Plank (LVP) Flooring

A multilayer vinyl plank with a printed wood-look layer and wear coat. Waterproof, durable, and DIY-friendly — the fastest-growing residential floor.

Luxury Vinyl Tile (LVT) Flooring

The tile-format version of luxury vinyl, often mimicking stone or ceramic, frequently grouted for a tile look without the cold or cracking.

M

Main Breaker Mechanicals

The single breaker that disconnects the entire panel and caps total service amperage.

Main Shutoff Valve Mechanicals

The valve stopping all water to the house. Every homeowner should know its location; remodels often add accessible zone shutoffs.

Make-Up Air Mechanicals

Replacement outdoor air supplied when powerful exhaust (large range hoods, whole-house fans) depressurizes a house. Code-required above set exhaust rates.

Manifold / Home-Run Mechanicals

A PEX distribution method with individual lines from a central manifold to each fixture, improving pressure balance and isolation.

Manual J Load Calculation Mechanicals

The industry-standard room-by-room heating/cooling load calculation that correctly sizes equipment. The right basis for any system replacement.

MERV Rating Mechanicals

Minimum Efficiency Reporting Value — a filter's particle-capture rating (1–16). Higher filters more but can choke airflow if the system isn't designed for it.

Metal Siding Exterior

Aluminum or steel panels (including standing-seam looks) — durable and modern; steel resists dents better, aluminum resists corrosion better.

Meter Base Mechanicals

The utility meter socket on the service entrance; replaced or relocated as part of a service upgrade.

Moisture Test Flooring

Measuring slab or subfloor moisture (calcium-chloride or RH probe) before installing wood or resilient floors. Skipping it is a leading cause of failure.

See also: NWFA — Technical Standards

Mortar Core terms

A cement-based paste used to bond masonry or, as thinset, to adhere tile to a substrate. Different mixes are rated for different applications and exposures.

Mortise Lock Windows & doors

A heavy-duty lock body recessed into a pocket cut in the door edge, more durable and secure than a tubular bored lock. Common on premium and older doors.

Mullion Windows & doors

A structural vertical (or horizontal) member dividing or joining adjacent window units.

Mullion (Door) Windows & doors

A removable or fixed center post between a pair of doors against which active leaves latch.

Muntin / Grille Windows & doors

The narrow bars dividing a window into smaller panes (true divided lite) or simulating that look (grilles between or on the glass).

N

Nail-Down Flooring

Fastening solid (or thick engineered) wood through tongue into a wood subfloor with flooring cleats or staples — the traditional wood install.

See also: NWFA — Technical Standards

Nailing Flange / Fin Windows & doors

An integral perimeter fin on new-construction windows fastened to the sheathing and integrated with flashing for a weather-tight install.

Natural Stone Tile Flooring

Travertine, slate, marble, or granite floor tile — durable and unique but porous, requiring sealing and species-specific care.

NEC (National Electrical Code) Mechanicals

The model electrical safety code adopted (with amendments) by jurisdictions. Permitted electrical work must meet the adopted NEC edition.

New-Construction Window Windows & doors

A window with a nailing flange for installation before siding goes on, used in new builds and full-frame replacements with siding removed.

Newel Post Exterior

The sturdy anchoring post at rail ends, corners, and stair tops/bottoms that gives the railing its rigidity.

NFRC Label Windows & doors

The National Fenestration Rating Council label that reports U-factor, SHGC, VT, and air leakage so windows can be compared on a common basis.

O

Obscure / Privacy Glass Windows & doors

Textured, frosted, or patterned glass that transmits light but blocks view, used in bathrooms and entry sidelights.

OSB Core terms

Oriented strand board — an engineered panel of compressed wood strands and resin, commonly used for sheathing and subfloor. Cheaper than plywood but less moisture-tolerant.

OSHA Core terms

The Occupational Safety and Health Administration — the federal agency setting and enforcing job-site safety standards. A contractor's safety record is a meaningful screening signal.

P

P-Trap Mechanicals

The U-bend at each fixture holding water that blocks sewer gas from entering the home. Every fixture needs one, properly vented.

Panel Door Windows & doors

A door built of a stile-and-rail frame surrounding raised or flat panels — the traditional look (e.g., two-panel, six-panel).

Parquet Flooring

Wood flooring set in geometric patterns (herringbone, chevron, basketweave). Labor-intensive to install; a design feature with a premium price.

See also: NWFA — Types of Wood Floors

Partition Core terms

A non-load-bearing interior wall that divides space but carries no structural load above it. Generally simpler and cheaper to move than a bearing wall.

PEI Rating Flooring

A wear scale (Class 1–5) for glazed tile indicating suitable traffic level. Floors need at least Class 3; high-traffic entries Class 4–5.

Penetrating Oil Finish Flooring

A hardwax or natural-oil finish that soaks into the wood for a matte natural look and spot-repairability, at the cost of more upkeep.

See also: NWFA — Wood Floor Finishes

Pergola Exterior

An open-rafter overhead structure on posts providing partial shade over a deck or patio; may be freestanding or attached.

Permit Core terms

Official jurisdiction authorization to perform regulated work, triggering required inspections. Unpermitted remodels can force teardown, block sale, and void insurance — always confirm permits are pulled.

Permit & Inspection (Mechanical) Mechanicals

HVAC, gas, electrical, and plumbing work is permitted, inspected trade work. Unpermitted mechanical work is a safety and resale liability.

See also: ICC — Consumer Safety Toolkit

PEX Mechanicals

Cross-linked polyethylene supply tubing — flexible, freeze-tolerant, fast to install with fewer joints. The dominant modern repipe material.

Picture Frame Border Exterior

A perimeter board around the decking that hides cut ends for a finished look; requires extra blocking to support it.

Picture Window Windows & doors

A large fixed (non-opening) window that maximizes view and light. Most energy-efficient type because there is no operating gap to leak air.

Plain / Flat Sawn Flooring

The most common, economical lumber cut, showing cathedral grain. More seasonal movement than quarter- or rift-sawn.

Plenum Mechanicals

The main air chamber off the furnace/air handler from which supply ducts branch and into which the return delivers.

See also: ASHRAE — Terminology: Plenum

Plumber Core terms

A licensed tradesperson who installs and repairs water supply, drain-waste-vent, and gas piping to code. Relocating fixtures or running new lines is licensed, inspected work.

Plywood Core terms

An engineered panel of thin wood veneers glued in cross-grain layers for strength and stability. Preferred over OSB for cabinet boxes and where moisture exposure is a concern.

Pocket Door Windows & doors

A door that slides into a cavity inside the wall, saving the floor space a swing would consume. Requires a special framed pocket during rough framing.

Polished Concrete Flooring

A ground and densified concrete slab finished as the final floor. Durable and low-maintenance; relies on slab condition and may telegraph cracks.

Polyurethane Finish Flooring

A durable clear topcoat for wood floors — oil-based (amber, slow-cure) or water-based (clear, fast-cure, low-odor). The wear surface of a site-finished floor.

See also: NWFA — Wood Floor Finishes

Porcelain Tile Flooring

A denser, less porous, harder-fired tile rated for heavy traffic and wet areas. Through-body porcelain hides chips; the durable flooring-tile standard.

Post Base / Standoff Exterior

A metal connector anchoring a post to its footing while holding the wood up off the concrete to prevent rot.

Post Cap Connector Exterior

A bracket positively tying the beam to the post top so the beam can't shift or roll off under load.

Prefinished Flooring

Wood flooring sanded and finished at the factory under controlled conditions. Faster install, durable finish, no on-site dust; bevels show at each board edge.

See also: NWFA — Wood Floor Finishes

Prehung Door Windows & doors

A door already mounted on hinges in a complete frame, ready to set into a rough opening. Faster and more reliable than hanging a slab in an existing jamb.

Pressure-Treated Lumber Exterior

Wood infused with preservative to resist rot and insects — the economical structural and decking choice. Ground-contact rated material is required for posts and joists near soil.

Primer Core terms

A preparatory coating that seals the surface and helps the finish coat adhere and cover evenly. Skipping primer over new drywall or stains causes finish failures.

Project Manager (PM) Core terms

The person who plans, coordinates, and oversees the project day to day — schedule, budget, subs, and communication with the owner. On smaller jobs the GC and PM may be the same person.

Punch List Core terms

The final list of incomplete or deficient items the contractor must correct before the job is considered done and final payment is released. Walk the project and build this list together.

PVC / Capped Decking Exterior

All-polymer or polymer-capped boards with the best stain/fade resistance and lightest weight; premium-priced and can be slick when wet.

Q

Quarter Sawn Flooring

Lumber cut radially for a straight, tight grain and ray fleck, more dimensionally stable and premium-priced than plain-sawn.

R

Radiant Floor Heat Mechanicals

Warming a space via tubing or electric mats under the floor. Even, comfortable heat; best designed in during a remodel when floors are open.

Rail Windows & doors

The horizontal members of a sash; the check/meeting rail is where two sashes overlap in a double-hung window.

Rail Post Tension Hardware Exterior

Brackets/bolts tying rail posts into the deck frame to meet the code load (200 lb at the top rail). Surface-screwed posts fail this.

Rainscreen Exterior

A drained, vented air gap between siding and the WRB that lets the wall dry and dramatically extends cladding life. Best practice for premium installs.

Re-Side vs. Side-Over Exterior

Removing old cladding to inspect/repair the WRB and sheathing (re-side) versus installing new siding over the old (side-over) — the latter hides problems and is often discouraged.

Receptacle / Outlet Mechanicals

The point devices plug into. Tamper-resistant receptacles are now code in dwellings; spacing rules govern how many a remodel must add.

Recessed Can / LED Downlight Mechanicals

Ceiling-flush lighting on a planned grid. IC-rated/airtight housings are required in insulated ceilings to prevent heat and air-leak issues.

See also: ENERGY STAR — Light Fixtures

Recirculation Pump Mechanicals

A pump delivering near-instant hot water at fixtures by keeping the line warm. Saves water; adds energy unless on a timer/demand control.

Reclaimed Wood Flooring

Flooring milled from salvaged old timber for character and sustainability. Requires extra screening for nails, stability, and consistent thickness.

Reducer Flooring

A transition piece that ramps from a higher floor to a lower adjacent one (e.g., wood to vinyl).

Refrigerant Mechanicals

The working fluid that carries heat in an AC/heat pump. R-410A is being phased down to lower-GWP refrigerants (e.g., R-454B) under EPA rules.

Register / Grille Mechanicals

The supply outlet (register, with damper) and return inlet (grille) terminating the duct in each room.

Retainage Core terms

A percentage of each payment (often 5–10%) the owner withholds until the project is satisfactorily completed, providing leverage to ensure the job is finished and punch-listed.

Return Air Mechanicals

Ducting that draws room air back to the system. Insufficient return is a common cause of weak airflow and short-cycling.

RFI (Request for Information) Core terms

A formal written question from the builder to the designer or owner to clarify drawings or specs before proceeding. RFIs create a paper trail that prevents costly assumptions.

Rift Sawn Flooring

Lumber cut at an angle for the straightest, most uniform grain and the greatest stability; the costliest and most wasteful cut.

Rim / Band Joist (Deck) Exterior

The outer joist closing the deck frame perimeter, to which fascia and rail posts often attach.

Rise & Run (Stairs) Exterior

The code-governed step height (rise) and depth (run), held consistent so stairs are safe. Uneven rises are a leading code-violation and trip hazard.

Romex / NM Cable Mechanicals

Non-metallic sheathed cable, the common residential branch wiring. Gauge must match the breaker (14 AWG/15A, 12 AWG/20A).

Roof / Tubular Skylight Windows & doors

A small reflective tube channeling daylight from a roof dome into a room below — economical daylighting where a full skylight won't fit.

See also: VELUX — Sun Tunnel Skylights

Rough Opening Core terms

The framed gap left in a wall to receive a window, door, or unit, sized slightly larger than the product to allow shimming and squaring during installation.

Rough-In Core terms

The stage where plumbing, electrical, and HVAC lines are run inside open walls and floors before insulation and drywall. Rough-in must pass inspection before walls are closed.

See also: Fieldwire by Hilti — Rough-In

Rubber Flooring Flooring

A resilient, slip- and impact-resistant floor used in gyms, play, and utility areas; available in tiles or rolls.

S

Sand and Refinish Flooring

Sanding a solid or thick-engineered wood floor to bare wood and re-staining/finishing. Restores worn floors and allows a full color change.

Sash Windows & doors

The framed, often movable panel that holds the glass within a window. Double-hung windows have an upper and lower sash.

Scaffold Core terms

A temporary elevated work platform system. Proper scaffolding is a regulated safety item on multi-story exterior and high-ceiling interior work.

Scope of Work Core terms

The detailed written description of exactly what the contractor will and will not do on the project. The single most important document for preventing misunderstandings and 'I thought that was included' arguments.

Screen and Recoat Flooring

Lightly abrading a worn finish and applying a fresh topcoat — a low-cost refresh that extends a wood floor's life without a full sanding.

Sealant Core terms

A material applied to a surface or joint to block the passage of water, air, or stains. Stone counters, grout, and exterior penetrations are commonly sealed.

Seamless Gutter Exterior

Gutter formed on site in continuous runs with no mid-run seams to leak — the residential standard over sectional gutter.

Section (Drawing) Core terms

A drawing showing the structure as if sliced vertically, revealing how floors, walls, and roof assemble and stack — used to communicate construction detail.

Sediment Trap / Drip Leg Mechanicals

A short capped pipe at a gas appliance that catches debris/condensate before it reaches the valve. Code-required and a common inspection item.

SEER2 Mechanicals

The current seasonal cooling-efficiency rating for AC and heat pumps (replaced SEER in 2023). Higher SEER2 means lower cooling energy use.

Self-Leveling Compound Flooring

A pourable cementitious mix that flows to a flat plane, correcting uneven subfloors before tile or resilient flooring.

Service Entrance Mechanicals

Where utility power enters the home — drop/lateral, meter, and main disconnect. Upgrading it is often the gating cost when adding major loads.

Service Panel / Load Center Mechanicals

The breaker box distributing power to circuits. Capacity (e.g., 100 vs. 200 amp) and free breaker spaces decide what a remodel can add.

Setback Core terms

The minimum required distance between a structure and the property line, street, or other features. Setbacks constrain where additions, decks, and detached structures can be placed.

Sewer Ejector / Grinder Pump Mechanicals

A pump moving waste up from below-sewer-level fixtures (basement bath) to the building drain. Required when adding a basement bathroom.

Shake & Shingle Siding Exterior

Individual tapered pieces (sawn shingles or split shakes) for a textured accent or whole-wall look, in cedar or composite.

Sheathing Core terms

The structural panel layer (plywood or OSB) attached to studs or rafters that braces the frame and provides a base for siding, roofing, or finishes.

Sheen (Floor Finish) Flooring

The gloss level of a wood-floor finish (matte, satin, semi-gloss, gloss). Lower sheens hide scratches and dust; higher sheens show wear and traffic.

See also: NWFA — Wood Floor Finishes

Sheet Vinyl Flooring

Vinyl flooring in continuous wide rolls with few or no seams — the most water-resistant and economical resilient option, common in baths and laundries.

SHGC (Solar Heat Gain Coefficient) Windows & doors

The fraction of solar heat a window admits (0–1); lower reduces cooling load. Climate determines whether high or low SHGC is desirable.

Shim Windows & doors

Thin tapered material used to plumb, level, and square a window or door in its opening before fastening. Improper shimming causes operation and seal failure.

Short Cycling Mechanicals

Equipment turning on and off too frequently — usually from oversizing or airflow problems — causing wear, poor comfort, and high bills.

Shutoff / Stop Valve Mechanicals

The local valve at each fixture allowing isolated repair without shutting the whole house. Adding/replacing them is standard during remodels.

Sidelite Windows & doors

A fixed narrow glazed panel beside an entry door that adds light and a wider, grander look.

Sill Windows & doors

The horizontal bottom member of a window frame, sloped to shed water away from the building.

Sill Pan Windows & doors

A waterproof tray at the base of a window rough opening that catches and drains any water that gets past the window to the exterior.

Single-Hung Window Windows & doors

A window with two sashes where only the bottom sash slides up to open; the top is fixed. The economical traditional double-hung alternative.

Site-Finished Flooring

Raw wood installed then sanded and finished in place, yielding a smooth seamless surface and any custom stain — at the cost of dust, fumes, and cure time.

See also: NWFA — Wood Floor Finishes

Skylight Windows & doors

A roof-mounted window for daylight and sometimes ventilation. Flashing and curb detailing are critical to prevent leaks.

Slab Core terms

A poured concrete floor or foundation surface. Moving plumbing in a slab-on-grade home means saw-cutting and patching concrete — a significant cost driver.

Slab Door Windows & doors

A door sold as just the panel, with no frame or hinges — used to replace a door in a sound existing jamb.

Slider Window Windows & doors

A window where one or both sashes slide horizontally. Simple, economical, and good for wide openings with limited projection space.

Sliding Patio Door Windows & doors

A large glazed door where one panel slides past a fixed one. Space-efficient (no swing) with a big glass area; rollers and tracks need maintenance.

Slope / Fall Mechanicals

Drain pipe must pitch about 1/4 in. per foot — too little won't clear solids, too much drains liquid off solids. A frequent DIY error.

Smart Lock Windows & doors

An electronic deadbolt with keypad, app, or auto-unlock control. Adds convenience and access logging; needs battery maintenance.

Smart Switch Mechanicals

A Wi-Fi/Z-Wave switch for app/voice/scheduled control. Many need a neutral wire in the box — a constraint in older homes.

Smart Thermostat Mechanicals

A learning/Wi-Fi thermostat with scheduling, remote control, and usage reporting; many qualify for utility rebates.

Smoke & CO Alarm Requirements Mechanicals

Code rules for interconnected smoke and carbon-monoxide alarms that a remodel of a sleeping area or fuel appliance typically triggers.

Soffit Exterior

The underside of the roof overhang (eave). Vented soffit is a key part of attic ventilation and is finished in vinyl, aluminum, or wood.

Soffit Vent Exterior

Perforated soffit or inserts that admit intake air to the attic, working with ridge/roof vents to control attic heat and moisture.

Soil Stack Mechanicals

The main vertical drain carrying waste from toilets and fixtures down to the building drain.

Solid Hardwood Flooring

Flooring milled from a single solid piece of wood, 3/4 in. typical. Can be sanded and refinished many times but moves with humidity and is not for below-grade.

See also: NWFA — Types of Wood Floors

Solid-Core Door Windows & doors

An interior door with a dense composite core for better sound dampening and a quality feel. A common worthwhile upgrade for bedrooms and offices.

Solid-Wood Door Windows & doors

A door built from solid lumber or stave-core, the premium traditional construction; can move seasonally with humidity.

Spacer Windows & doors

The bar separating the panes of an insulated glass unit. 'Warm-edge' spacers reduce edge heat loss and condensation.

SPC Core Flooring

Stone-Plastic Composite — a rigid, dense LVP core that is very dent- and temperature-stable and hides minor subfloor imperfections.

Splash Block / Drain Extension Exterior

A block or pipe directing downspout discharge away from the foundation — the cheapest defense against basement and crawl-space water.

Stair Nosing Flooring

The shaped, often non-slip edge piece at the front of a stair tread, matched to the flooring for safety and a finished look.

Stair Stringer Exterior

The notched or solid sloped member carrying deck stair treads. Stringer span, spacing, and attachment are common failure points.

Starter Strip Exterior

The first course's anchoring strip at the bottom of the wall that locks in the first siding row at the correct angle.

Static Pressure Mechanicals

Resistance to airflow in the duct system. High static (undersized ducts, dirty filter) overworks the blower and cuts capacity.

Steel Entry Door Windows & doors

An insulated steel-skinned exterior door — strong, secure, economical, but can dent and may show thermal bowing in sun.

Stile Windows & doors

The vertical members of a sash or door panel frame.

Stone Veneer Exterior

Natural or manufactured stone facing applied to a wall. Manufactured (adhered) veneer is lighter/cheaper; both demand a proper drainage plane behind.

Stool Windows & doors

The interior horizontal shelf at the bottom of a window, what people commonly call the inside sill.

Stop-Work Order Core terms

An official order halting construction, usually for working without a permit or a code/safety violation. Work cannot resume until the issue is resolved and the order is lifted.

Storm Door Windows & doors

A secondary exterior door (often glass/screen interchangeable) mounted outside the entry door for added weather protection and ventilation.

Strike Plate Windows & doors

The metal plate on the jamb the latch and bolt engage. Long screws into the framing here are the single cheapest security upgrade.

Structural Screw Exterior

An engineered, code-listed screw rated for structural connections (ledgers, posts), replacing lag bolts in many deck details.

Stucco Exterior

A cement plaster applied in coats over lath, traditional (three-coat) or one-coat synthetic. Durable but crack- and moisture-detail sensitive.

Stud Core terms

A vertical framing member in a wall (typically 2x4 or 2x6) spaced 16 or 24 inches on center, forming the structure to which sheathing and drywall attach.

Subcontractor Core terms

A specialized trade (electrician, plumber, tile setter) hired by the general contractor to perform a portion of the work. You contract with the GC, not the subs.

Subfloor Core terms

The structural sheet material (plywood or OSB) fastened over floor joists that everything else — underlayment and finish flooring — is built on. Squeaks and unevenness usually start here.

Subfloor Flooring

The structural panel layer over the joists. Its flatness, soundness, and moisture content govern which finished floors can go down and how.

Subfloor Squeak Flooring

Noise from movement between subfloor, joists, or fasteners. Best corrected from below or by screwing the subfloor before new flooring goes down.

Submittal Core terms

Product data, samples, or shop drawings the contractor submits for approval before ordering or installing, confirming what will actually be used matches the specification.

Subpanel Mechanicals

A secondary panel fed from the main, adding circuits for a remodel, addition, garage, or shop. Requires correct 4-wire feeder and isolated neutrals.

Superintendent Core terms

The on-site supervisor who runs the field operation — directing crews, sequencing trades, and enforcing safety and quality at the job site.

T

T&P Relief Valve Mechanicals

The temperature-and-pressure safety valve on a water heater that prevents tank rupture. Must discharge per code; never plugged.

Tackless Strip Flooring

The thin pinned wood strips around a room perimeter that grip and stretch stretch-in carpet over the pad.

Takeoff Core terms

The process of measuring quantities of materials and labor from the drawings to build an estimate. Accurate takeoffs are the foundation of an accurate bid.

Tamper-Resistant Receptacle Mechanicals

An outlet with internal shutters preventing object insertion, code-required in dwelling living spaces.

Tank Water Heater Mechanicals

A storage water heater keeping a tank hot. Lowest upfront cost; standby losses and limited capacity are the trade-offs.

Tankless Water Heater Mechanicals

An on-demand heater with endless hot water and no standby loss. Higher install cost; gas units often need larger gas/vent lines.

Telegraphing Flooring

Subfloor seams, fasteners, or debris showing through a thin resilient floor. Prevented by proper underlayment and substrate prep.

Tempered Glass Windows & doors

Heat-treated safety glass that is much stronger and breaks into small blunt pieces. Code-required near doors, floors, tubs, and large low panes.

Terrazzo Flooring

A poured or precast composite of stone/glass chips in a binder, ground and polished. Extremely durable and seamless; a premium custom floor.

Thermal Break Windows & doors

An insulating barrier within a metal frame that interrupts heat conduction, substantially improving an aluminum window's efficiency.

Thermal Movement (Composite) Exterior

Composite/PVC boards expand and contract with temperature more than wood; gapping and fastening must follow the maker's spec or boards buckle.

Thermostat Mechanicals

The control that calls for heating/cooling. Programmable and smart models cut energy by matching conditioning to occupancy.

Thinset Flooring

The cement-based adhesive mortar that bonds tile to the substrate. Modified vs. unmodified selection depends on tile type and membrane used.

Three-Way / Multi-Way Switch Mechanicals

Switches controlling one fixture from two or more locations (stairs, long rooms). Adds wiring complexity in a remodel.

Threshold Windows & doors

The bottom member of an exterior door opening, often adjustable, that works with the door bottom and sweep to seal out water and air.

Threshold (Floor) Flooring

The transition member at a doorway between two flooring types or rooms.

Tonnage Mechanicals

AC/heat-pump cooling capacity (1 ton = 12,000 BTU/hr). Sized by a load calculation, not square footage rules of thumb — oversizing hurts comfort and humidity control.

Transition Strip Flooring

A molding bridging two floors or a doorway (T-mold, reducer, threshold) that covers the gap and manages height changes.

Transom Windows & doors

A window above a door or window, fixed or operable, adding daylight and architectural detail.

Trim / Casing (Exterior) Exterior

The boards around windows, doors, and corners (wood, PVC, composite). PVC/composite trim resists the rot that plagues painted wood trim.

Triple-Pane / Triple-Glazed Windows & doors

A three-pane insulated unit with two gas-filled cavities for superior insulation and sound control, used in cold climates and high-performance builds.

Tropical Hardwood (Ipe) Exterior

Dense, durable hardwood decking (ipe, cumaru) that lasts decades but is heavy, hard to fasten, costly, and needs sourcing diligence.

Two-Stage / Modulating Mechanicals

Equipment that runs at partial capacity most of the time for efficiency and comfort, ramping up only on extreme days.

U

U-Factor Windows & doors

The rate of non-solar heat flow through a window; lower means better insulation. The primary winter-performance metric on the NFRC label.

UEF (Uniform Energy Factor) Mechanicals

The standardized water-heater efficiency metric for comparing models; higher UEF means less energy per gallon delivered.

Uncoupling Membrane Flooring

A layer (e.g., Ditra-type) between subfloor and tile that absorbs substrate movement so tile and grout don't crack — standard over wood subfloors.

Under-Deck Drainage Exterior

A membrane or panel system below the joists that channels water away, creating dry usable space under an elevated deck.

Underlayment Flooring

A thin layer between subfloor and finish floor for smoothing, sound, moisture, or cushioning. The required type depends on the finished floor.

V

Value Engineering Core terms

Reviewing the design to find lower-cost ways to achieve the same function and quality — substituting materials or methods to bring a project back within budget without gutting its goals.

Vapor Barrier Core terms

A material that limits moisture diffusion through an assembly to control condensation. Correct placement is climate-dependent — wrong-side vapor barriers trap moisture and cause rot.

Vapor Retarder (Floor) Flooring

A moisture barrier between a slab or crawl space and wood/laminate flooring that protects it from below-grade humidity.

Variable-Speed Blower Mechanicals

An ECM blower that ramps output to match demand for steadier temperatures, better humidity control, and lower electricity use than single-speed.

Variance Core terms

Official permission to deviate from a zoning requirement (e.g., to build closer to a property line than the setback allows). Requires application and usually a hearing.

Veneer Core terms

A thin layer of a finish material bonded to a cheaper substrate — wood veneer on cabinet panels, stone or brick veneer on walls — delivering the look without the solid-material cost.

Vent Stack Mechanicals

The piping admitting air so drains flow without siphoning traps, terminating through the roof. Adding fixtures often means new venting.

Vinyl Composition Tile (VCT) Flooring

Economical, durable composite tiles common in commercial and utility spaces; requires periodic stripping and waxing.

Vinyl Siding Exterior

Interlocking PVC panels — the most economical, low-maintenance cladding. Quality varies by panel thickness; must be hung loose to move with temperature.

Vinyl Window Windows & doors

A PVC-framed window — low cost, low maintenance, good insulation. The dominant residential replacement material; quality varies widely by brand.

Visible Transmittance (VT) Windows & doors

The fraction of visible light a window transmits (0–1); higher means a brighter, clearer view.

VOC (Volatile Organic Compounds) Core terms

Gases emitted by some paints, finishes, and adhesives that affect indoor air quality. Low- and zero-VOC products are widely available and recommended for occupied remodels.

W

Water Hammer / Arrestor Mechanicals

The bang when fast-closing valves stop flow; an arrestor cushions it to protect pipes and joints.

Water Pressure / PRV Mechanicals

Household pressure (ideally ~50–70 psi). A pressure-reducing valve protects fixtures where street pressure is too high.

Water Service Line Mechanicals

The pipe from the municipal main or well to the house. Old galvanized or lead service lines are often replaced during major remodels.

See also: U.S. EPA — Lead Service Lines

Water Softener Mechanicals

Equipment that removes hardness minerals to protect pipes, fixtures, and water heaters. Often added during a plumbing remodel.

Water Table / Belt Course Exterior

A projecting horizontal trim that visually breaks a tall wall and sheds water at a transition between siding types or stories.

Wear Layer (Wood) Flooring

On engineered wood, the thickness of real wood above the core that determines how many times the floor can be sanded and refinished.

Weather-Resistive Barrier (WRB) Exterior

House wrap or building paper behind the siding that drains incidental water and blocks air while letting the wall dry. The wall's secondary water plane.

Weatherstripping Windows & doors

Compressible seals around a door or operable window perimeter that block air and water infiltration. A cheap, high-impact efficiency item.

Weep Hole Windows & doors

A small opening in the bottom of a window frame or sill that drains incidental water to the exterior. Blocked weeps cause leaks and rot.

Weep Hole / Weep Screed Exterior

Drainage outlets at the base of brick veneer or stucco that let trapped water escape. Blocked weeps trap moisture and rot the wall.

Whole-House Filtration Mechanicals

Point-of-entry treatment (sediment/carbon) for all household water, plumbed at the service entrance.

Whole-House Surge Protector Mechanicals

A panel-mounted device clamping voltage spikes to protect all home electronics. Now required by code on service upgrades in many areas.

Whole-House Ventilation Mechanicals

A planned system delivering fresh outdoor air, increasingly required as homes are built and remodeled tighter.

Wide Plank Flooring

Flooring boards over ~5 in. wide. Fewer seams and a high-end look, but more visible seasonal gapping, so acclimation and humidity control matter more.

See also: NWFA — Types of Wood Floors

Window Flashing Integration Exterior

The shingle-lapped sequencing of sill pan, jamb, and head flashing with the WRB so water always drains out and down, never into the wall.

Wire Gauge (AWG) Mechanicals

The American Wire Gauge sizing of conductors to their amperage. Undersized wire on a too-large breaker is a fire hazard.

Wood Siding Exterior

Natural cedar/pine in clapboard, shingle, or shake form — classic and repairable but the highest maintenance (paint/stain cycles, rot watch).

Wood Window Windows & doors

A traditional wood-framed window with the best natural insulation and classic look but the highest maintenance unless clad.

Working Clearance Mechanicals

Required clear space in front of a panel (about 36 in. deep, 30 in. wide). Remodels can't bury or block a panel.

WPC Core Flooring

Wood-Plastic Composite — a softer, warmer, more cushioned rigid vinyl core than SPC, but slightly less dent-resistant.

Z

Zoning Core terms

Local laws governing how land may be used and what can be built where, including size, height, and setback limits. Additions and footprint changes often require zoning review.

Zoning (HVAC) Mechanicals

Dampers and thermostats dividing a house into independently controlled areas for comfort and efficiency, common with two-story homes.

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