Slab insulation

Weezbo

the spray foam is not real good idea because its expansion has "variables". only think, that i have some degree of confidence with is, oil absorption matting with a vapor barrier..the r value is not all that hot though ,so, i would not recommend it as an alternative with all the insulation board options we have these...that basically you will have to file under 'Weezbo creativity' from an age gone by :)

Scott OB

Under slab insulation

What would your choice be besides rigid foam for under slab radiant garage heat in the northeast?Any suggests would be appriecated. Scott

hot_rod

Not many

if you want an R-5 to R-10 you need 1 or 2" of foam. NW Foam now has a 3/4" roll foam product, and they may offer a 1" roll out product.

I did one job where the actually spray foamed the gravel! Not recommended in my opinion. Very un-even and $$$.

You definitally want 1-1/2 or 2" of foam around the edge and at least 4 feet of the perimeter.

You may chose to use a roll product for the rest. A lot depends on the subgrade material, and the conductivity of it. Loose washed gravel (pea gravel) is a poor conductor. Solid rock or clay would require a good r value.

Thre product you choose needs to have the proper psi rating, be waterproof, listed for underslab installation, and ideally... insect proof

hot rod

Richard_6

Please Check out...

www.crete-heat.com

Scott OB

Crete Heat

Thanks for every ones info.The Crete Heat looks like something I would like to use.