Mechanicals · definition
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.
Source: InterNACHI — Understanding Your Home’s Waste and Vent System
Where this term lands on a Columbus budget
The cost pages carry the current local ranges, and the guides explain what moves them. A published range becomes a project number only after someone looks at the site.