Wall & Rim Joist Spray Foam in Chester County
Cold first floors and drafty rooms trace back to two places: walls with settled fiberglass and an unsealed rim joist. Both can be fixed with foam — most of the time without opening a single wall.
Free wall & rim joist quote:
+16106401009Rim Joist Sealing — The Best Dollar-Per-BTU in Your House
The rim joist — where your floor framing sits on the foundation — is a band of wood with a fiberglass batt at every bay, usually falling out. Closed-cell foam seals it air-tight in one pass. Most Chester County basements show visible daylight through these bays in winter. Cost: $800-$1,800 for a typical colonial, and it's the single most noticeable comfort upgrade we install.
Wall Foam — Retrofit Without Demolition
Dense-pack or injection foam fills settled wall cavities from small exterior holes, patched after. Your stone, stucco, or siding stays intact. Ideal for Chester County's pre-1970s housing stock where the original fiberglass has given up.
Pricing
| Project | Price |
|---|---|
| Rim joist, typical colonial | $800 – $1,800 |
| Injection foam walls | $2 – $3.50 / sq ft of wall |
| Basement wall closed-cell | $2.50 – $4.00 / sq ft |