Why Closed-Cell Spray Foam Insulation Is More Durable Than Other Types
Closed-cell spray foam insulation is more durable than other types because of its dense cellular structure that creates a rigid, water-resistant material with compressive strengths of 25-30 psi compared to less than 1 psi for traditional insulation. This structural integrity allows closed-cell foam to maintain its shape, performance, and R-value for 30+ years without sagging, settling, or degrading. Its closed-cell matrix also prevents water absorption, with less than 2% water uptake by volume, while fiberglass can absorb up to 50% of its weight in water and lose up to 60% of its insulating value when damp. The superior durability of closed-cell spray foam comes from its chemical composition and application method. Unlike open-cell foam (which has an approximate density of 0.5 pounds per cubic foot), closed-cell foam's density of 2-3 pounds per cubic foot creates millions of tiny, sealed bubbles that resist compression, moisture penetration, and air infiltration. This structure en...