A “mason” is pouring a 5″ slab over sand,sheet plastic, 2″ rigid insulation, wire and PEX tubing. This is for a 2 car garage on a house we are working on. Won’t there be a problem with the water coming to the surface, and/or should a water reducer be used? Thanks, J landi
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Thadeus/J:
Your mix needn't be quite as wet, but there is no problem pouring over plastic. In fact, it's better, bec you won't lose your water prematurely into the sand/gravel at the bottom of the slab. A plasticizer (water reducer) will add workability and make it flow better around the mesh and tube, however.
If you want more advice on this, re-post this discussion in the Construction folder, or even General Discussion--you'll find a greater abundance of concrete gurus hanging out there than in this HVAC folder.