Open-cell spray foam (0.5 lb density) is a softer, semi-rigid foam that expands dramatically on application — up to 100 times its liquid volume. It provides excellent air sealing, good thermal performance, and outstanding sound dampening at a lower cost than closed-cell foam.
Open-cell foam is the preferred choice for interior wall cavities, attic ceilings (cathedral and flat), and anywhere acoustic performance matters. Its breathable structure allows vapor to pass through, making it compatible with proper vapor management strategies in Climate Zone 5A.
Good thermal performance at a lower installed cost than closed-cell
Soft, open-cell structure absorbs sound waves — ideal for interior party walls and floors
Fills every irregular gap and cavity that batts and boards leave unsealed
Breathable structure suits interior applications where vapor management is important
20–30% less expensive per installed R-value in typical residential applications
We confirm open-cell is the right product for your specific assembly and climate conditions.
All surfaces, fixtures, and penetrations masked before foam application.
Applied in passes to achieve specified thickness. Off-gassing ventilation maintained.
Excess foam trimmed flush with framing. Coverage verified to specified R-value.
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.