Exterior · definition
Corrosion-resistant fastener choices for treated lumber. Modern treated wood is corrosive — using under-rated hardware causes premature connection failure.
Source: Simpson Strong-Tie — Corrosion Information for Wood Connectors & Fasteners
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.