So you’re insulating a subfloor and have heard spray foam offers the best R-value, so it doesn’t matter whether you use open or closed cell foam, right?
All foam is not created equal, especially when it comes to subfloors. Here’s why:
Although 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. 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.
If you have a residential renovation or new construction project coming up that involves a subfloor, crawlspace, or basement, let NOVA Spray Foam give you a FREE personalized estimate.