M and M Insulation

Attic Insulation West Metro
Pros and Cons of Closed and Open Cell Spray Foam Insulation

What makes traditional insulation such as fiberglass, cellulose, and open cell spray foam resist heat flow? Those items work because of their ability to trap air. The greater the number of air pockets, the higher the R-value.

What makes closed cell spray foam superior is that in addition to trapping air, it also prevents air from flowing through it, and therefore reduces the heat scavenging effects of wind-washing. It's like putting a windbreaker over a sweater.

When it comes to spray foams, their performance is governed by:
  • The number of bubbles or pockets
  • The size of the bubbles
  • What the bubbles are filled with
Spray foam costs more than traditional insulation but it can be a very cost effective way to build high-performance homes and meet stricter energy codes.