I purchased a 12'x16' structure (shed). I have paid the builder to
insulate the floor as part of the construction. I need to insulate
the walls and gambrel roof. The three things I'm considering are
fiberglass (pink) batts, rigid foam, and spray foam. The first to
I can do myself. The third I would like to do myself, but I know
the installation is critical to the proper functioning of spray
foam so I should have someone with experience do the installation.
Fiberglass insulation would be the cheapest of the prices I have
looked found. Spray foam (closed cell) would fill gaps and form
another barrier inside the outer sheeting. Rigid foam I would either
do two layers or would create a "box" with a hollow core that I
would push between the studs. Fiberglass and rigid foam would have
gaps between the outer surface and the outer sheeting that I'm
concerned would allow mold growth.
Seems to me spray foam would be best for my situation. I'm concerned
about off gassing (another reason to have some do this so the 2"
installation depth is not exceeded) and the R value seems to be
about the same as rigid foam.
Oh, also seems that gravity would cause fiberglass to lose loft,
compress, in the gambrel sections since I must apply the insulation
I know there is significant prep work before foaming, and I don't
mind doing the prep work.
Thanks again for your help.