Quick question. I am about to take the batting insulation out and replace it with rigid foam and great stuff. I live way north, rural, so it is cold. I have a lot of air leaks and loss of heat in these joists. I have a bunch of 1 1/2 inch foam, I don't know the r value off hand but think it is 7 or 8.
My question is should I double it and will that double the R value? Is it worth the hassle to double it up?
My question is should I double it and will that double the R value? Is it worth the hassle to double it up?