Under Slab Insulation

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What's "under slab insulation" ? Before pouring the 4" concrete floor in the basement today (hooray!), Rick installed R-5 1" 25psi foam insulation on the entire floor. This will provide some insulation from the ground and keep heat from escaping through the floor, particularly in the bathroom where the radiant electric mat will be under the tile. The bathroom tub drain area is boxed out so the plumber can install the p-trap when the tub is installed, rather than putting the drain now and having to move the tub to the exact location to meet it. Also, the custom curbless shower pan is boxed out so we can put a sloped base around the drain.

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