3 ms·
Double stud construction with blown in cellulose is much cheaper than spray foam, and way better for the environment. Also, if you want close to passive house,
by turtlebits 5y ago
Double stud construction with blown in cellulose is much cheaper than spray foam, and way better for the environment.
Also, if you want close to passive house, you'll need way more than R-21. I would say only use spray foam if your wall cavity is limited and you need the maximum R value.
- hourislate 5y agoDouble stud construction cheaper? Maybe a while back... Spray Foam although rated at R-21 preforms much higher since it seals. Blown in Cellulose settles, attracts dust, rodent nesting, and doesn't seal and isn't a vapor barrier or water proof. You get what you pay for I guess. We have a house in Northern Ontario that is around 4000 Sq/Ft (entirely spray foamed). The costs to heat and cool it are 1/3 compared to the house 2800 sq/ft house in Toronto (insulated with Fiber Glass, Attic Cellulose). The biggest hurdle is folks just don't give a fuck about the mechanical part of the house. Dry wall covers it all up. What's important is the finish that you see everyday.