Open-Cell Spray Foam at Rim Joist
I think I want closed cell foam, but the only spray foam contractor that I’ve been able to obtain a quote from wants to spray open cell foam in the basement rim joist of my home at the southern edge of Zone 4. It’s a walkout basement and the rim joist is anywhere from 18 inches to 8 feet above grade. Do I need to be worried about the vapor permeability of open cell in my region?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part