Exterior · definition
The continuous surface (the WRB and its flashings) designed to carry any water that gets behind the cladding safely back out.
Source: Building America Solution Center (DOE) — Drainage Plane Behind Exterior Wall Cladding
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.