Is there a super-thin, high R-value insulation, not plain rigid?
I may repost this in the Old House forum as well, not sure if this is a space age product questions or insulating an oldie... but figured there may be a "new" product knowledgeable person here that may know this.
I have an old A-frame cabin, about 325 sq', just had the roof and cold floor spray foamed. Also cuboard interiors. What's left is the end walls (non-sloping). So approx 3/4 of the place is now tight.
The wall construction seems to be 2" of cedar boards, then shingled on outside. I think no tar paper as I can see light coming through the boards!
With the built in kitchen and bed in loft there is nowhere to frame in space for insulation without a serious reno (no budget left for that). I'm wondering if there is a super thin insulation (panels??) that may come anywhere near to R-13?
The rigid is way too thick, I think it was 2".
Any other ideas? Thanks!