Closed-cell spray foam (2 lb density) is the highest-performance insulation product available. Its rigid, dense structure provides R-6.0 to R-7.8 per inch, acts as a Class II vapor retarder, and adds measurable structural strength to the assembly — all in a single application.
Closed-cell foam is the definitive solution for basements, crawl spaces, rim joists, and exterior walls in New England. In Climate Zone 5A, where moisture management is critical, closed-cell foam eliminates the separate air barrier, vapor retarder, and insulation steps into one product.
Highest R-value of any spray-applied insulation — meets MA basement code in 2.5 inches
Acts as Class II vapor retarder at ≥2" thickness — no separate vapor barrier needed
Increases wall racking strength up to 300% — recognized by some building codes
Will not absorb water or lose R-value when exposed to moisture
Achieves air barrier classification at just 1 inch of thickness
Confirm substrate conditions, moisture levels, and code requirements before foam selection.
Temperature verification (foam requires 40°F+ substrate), masking, and protection of adjacent surfaces.
Applied in lifts no greater than 2" to manage exothermic heat. Specified total thickness achieved.
Adhesion, coverage, and R-value verified. Documentation provided for permits and Mass Save.
Response within 2 hours. Mass Save® eligibility reviewed on every quote.
Get Free Estimate → 📞 857-214-2434Most MA homeowners qualify for 75–100% rebates on qualifying insulation and air sealing projects. We handle all paperwork.
Learn About Mass Save →Free estimate. Mass Save® eligibility reviewed. Response within 2 hours, Mon–Fri.