A client wants me to insulate a ceiling from outside. He says there is a product that goes under composition shingles. Has anyone heard of this product ?
Thanks.
A client wants me to insulate a ceiling from outside. He says there is a product that goes under composition shingles. Has anyone heard of this product ?
Thanks.
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Replies
I presume you mean insulate the roof from the outside?
Rigid foam board sandwiched between plywood sheets. One sheet nailed on the trusses/rafters, insulation on top, then plywood placed on board, nailed through board to rafters. Thickness of board depends on R value needed.
Your correct I meant roof. Do you have a specific brand name for the rigid foam board ? Thanks for the response.
None specific. Good lumber yards or a roofing supply will carry it. We've used it many times on commercial roofs screwed to the deck before the roofing membrane goes down. In that application 3" is the norm, which should give an R value of about 30+-.
"A contented man enjoys the scenery of a detour"
Edited 6/8/2004 10:52 pm ET by TKH
What insulation has an R value per inch of 10?
The highest I know of is polyiso which is something like 7.2/".
Jon Blakemore
It's Iso board and the new enviro freindly stuff has been downgraded a little to R-6 or so. Still that's not bad.
R-Max is one Firestone is another