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Registered
Join Date: Mar 2001
Location: Priddis,AB,Canada
Posts: 1,709
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2" is a minimum depth, that is so you make sure you do not cut the tube when you cut the control joints, or if you want to fasten down walls with hilti nails. The idea is that the whole slab is heated, so if the tubes are in the middle to slightly below it would be best, but doesn't really make much difference.
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Robert
Currently Porsche less (but the wife has 2)
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