05-06-16, 10:25 PM | #1 |
Apprentice EcoRenovator
Join Date: Jun 2010
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Asphalt covered styrofoam
Have a line on 4inch thick 2ft X 4ft high density blue styrofoam (probably roofmate) price is about $3 per pc ($12 per full sheet) Canadian or $9.60 us. Thirty cents US per sq ft.
It was used on a roof and covered both sides with hot tar. I want to use it to insulate under a 2 inch floor slab with hydronic heat tubes. The construct will be something like water proof membrane, 1 or 2 inches of styrocrete,on grade, at about 1 cement 2 sand 6 or 8 ground up styrofoam by volume. 4 inches of tar covered styrofoam piping and sand to just cover the pex heat pipe 2" normal cement possibly with mesh. for a normal house hold floor. My concern is with the tar, over the years it does not seem to have harmed the foam, but will the tar/oils be able to migrate upwards through the concrete? Your thoughts would be appreciated. |
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