Lynden basement finish

This Berthusen-area Lynden home had a full 1,200 sq ft unfinished basement that had been used as storage for the fifteen years the current owners had lived there. With kids becoming teenagers, they wanted a family room, a guest bedroom with egress window, and a full bath — essentially doubling their usable living space.

The first job was moisture management. We applied closed-cell spray foam directly to all concrete walls, then framed interior walls off the foam with a 1-inch air gap. This is the assembly that actually works in Whatcom County basements — vapor sealed at the concrete, insulated in the cavity, and dry.

Egress window install required cutting a substantial opening through the concrete foundation wall — done cleanly with a concrete saw crew, then the window and steel well went in with proper drainage tied to the perimeter drain. The bathroom required an ejector pump since the sewer main is above basement floor level. Framing, drywall, flooring, and finish took about eight weeks total.

Two-story family home, Berthusen area, Lynden.

Full basement finish, egress window, bathroom.

Closed-cell foam, LVP flooring, tile bathroom, ejector pump.