I have an older building with 2x4 studs and 2x6 rafters- can soy spray foam help me meet insulation code?
In older structures the stud and rafter dimensions are usually less than new construction, which does not leave enough room for open cell foam or other forms of insulation. The only material currently available that meets the Building Code requirements for R19 in a 2x4 wall and R38 in a 2x6 rafter, is closed cell foam.