Thu, 07 May 2026 20:05:36 +0000

This Hidden Flaw in Closed Cell Spray Foam Could Ruin Your Project (And How to Avoid It) When it comes to insulation and sealing, closed cell spray foam is often hailed as a near-perfect solution—providing superior moisture resistance, high thermal performance, and long-term durability. But beneath its impressive reputation lies a hidden flaw that can compromise the integrity of your construction or renovation project, often unnoticed until serious issues arise. ### What Is Closed Cell Spray Foam? Closed cell spray foam insulation is a dense, rigid material with tiny enclosed air pockets that block moisture flow and deliver impressive R-values (thermal resistance). It’s widely used in foundations, walls, flat roofs, and basement applications where air and moisture control are critical.