Special Holiday Offer2 Gifts for $16It’s Like Getting One Free!
Does anyone know what is the general thickness of R-30 Rigid Insulation?
Does it need air gap and how much?
Which is the best company name to use?
Where are you fixin to install the stuff?
Have you checked the manufacturers instructions?
If you are talking about rigid foam insulation, it depends on the type of foam used. Some are rated as low as R4/inch, some as high as R8/inch but R-6 to R-6.5/inch is pretty typical. No gap between the foam and the interior side wall siding, at least 3/4" gap to the exterior side wall siding.