Sub-Slab Insulation and In-Floor Radiant Heat
I have a customer who wants to install electric radiant slab heating in a garage addition. The garage perimeter footings will be 5′ down and the walls will sit on top of 8″ ICF frost walls 4′ tall. The manufacturer of the floor heat says it is better to not install sub-slab insulation and instead use the ground as a heat sink, but I can not find a real argument for one way versus the other when floor heat is concerned. Will it be more efficient to do it the manufacturer’s suggested way or to install 4″ of foam board underneath the slab first? The addition will be done in North Dakota where we encounter many sub-zero days in the wintertime.
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