Originally Posted by lornaschinske
Where? Ceiling? Wall? Floor?
The initial question was about the walls.
I want no less than an inch of insulation on the floor. I'll probably do 2 inches since (*I'm short* and
) the roof is higher than normal and I may augment walkways with thick throw rugs. After living in a home with a bedroom over an uninsulated "mud room", I'm all about putting extra insulation on the floor to help keep my feet warm in the winter - socks and slippers don't always cut it
For the ceiling, I'm debating 2 paths, both of which involve adding a full-length roof-deck:
1) Taking down the interior metal and reinsulating with 1-1/2" of board foam (made of layers of thinner material), then resurfacing like most folks do.
2) Leaving the interior alone. Gluing several layers of foam board to the roof, cover with a waterproof material (pond liner, fiberglass, whatever), then covering that with the roof deck.
Option 1 is conventional and a proven method that works.
Option 2 is totally experimental and I'm probably not brave enough to try it. But it has potential to be just as effective as #1 and provides the advantage of not lowering the ceiling in the living area if I wanted to add more insulation.
My main purpose is to get the best Rvalue possible while infringing the least on interior space. This may eventually be a long-term living space for me. I want to do it right the first time instead of wishing I'd taken the time and spent the money to do something better.