Closed Cell spray foam insulation subfloor

The subfloor insulation debate rages on and we’re here to help you sort it out. When it comes to insulation for your basement or crawl space ceiling, which is best: fiberglass, open cell, or closed cell insulation?


Sure you’ve probably heard that spray foam offers the best R-value per square inch, but given the choice of open and closed cell, which would you choose?
All foam is not created equal, especially when it comes to subfloors. Closed cell spray foam is above and beyond your best option. Here’s why:

subfloor spray foam insulation EnviroFOAMAlthough they’re both great insulators, open cell foam and fiberglass can trap moisture within floor systems, causing wood floors to cup, buckle, and stain. When applied to subfloors and crawlspaces, open cell is exposed to humidity, critters, and ground moisture. With these forces combined, long term trouble awaits and insulation efficiency suffers.

As the only insulation approved by FEMA, closed cell is the optimal choice to effectively insulate subfloors in flood zones. Not only is it waterproof, it also increases the strength of the building to which it is applied. As a vapor barrier, closed cell creates a seal that prevents humid air from moving through the insulation and into your home, keeping humidity and moisture out.

Before you dig into your next crawl space, basement, or subfloor renovation, Call EnviroFoam for a FREE consultation.