Thermomass vs subslab foam Mixed Humid
I’m planning a (monolithic) slab for my house in Zone 3 (2800 HDD; 1800 CDD) where frost maxes out at 8” but the termites are as plentiful as pollen. So, external insulation on a slab won’t work. But Robert referred to ThermoMass and that seems perfect for this area since the foam is isolated by the concrete.
I’m wondering if I can do away with subslab insulation board in this climate – if the side slab insulation will keep the slab the same temp (60-65 degrees) all the way across or if the temperature/range will be significantly improved by adding ~$3000 worth of rigid foam.
Thanks for the input
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