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swampwiz_gw

Is slab heat gain (or loss) a major concern in a warm climate?

14 years ago

I'm wondering how much heat conductivity there would be for a slab. It would seem that in a warm climate, the ground would not get below the mid 60's, so there should be little effect with the slab footprint in the winter, and likewise the temperature in the summer would not get above the mid 70's.

But there is the problem of heat gain/loss through the perimeter of the slab (i.e., the 6" or so above the ground.) Perusing various websites that purport to calculate this heat gain/loss seems to show some surprisingly high values (i.e., on the same order as the walls, which are 18 times taller!) I suppose that if concrete has a low R value (~ 1 ft^2-hr-F/BTU), even if there would be no heat transfer down to the soil, there would still be some heat transfer from the floor near the walls. But then there would be some R value of the flooring that come into play (e.g., carpet has R = ~ 2 ft^2-hr-F/BTU).

Anyone have any insight into this?

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