Re: in floor heat?? without floor insulation

Posted by MarkB_MI on January 08, 2023 at 19:12:27 from (174.240.144.249):

In Reply to: in floor heat?? without floor insulation posted by herk on January 07, 2023 at 21:49:34:

Insulation around the perimeter is most important. The deeper you go with the perimeter insulation, the less important it is to insulate under the slab. But if you only insulate the sides down the depth of the slab, you need to insulate under the slab as well, as heat will escape under the perimeter insulation.

I didn't go deep with the insulation around my slab, but insulated under the entire slab. I put 2 inches of foamboard along the sides, then put down 2 inches of foamboard under the first four feet of the slab next the walls. The rest of the slab I only used 1 inch foamboard, which was a bit cheaper and allowed me to make the center of the slab thicker.

I don't believe the claims for the bubble-wrap insulation. And I would never put it under a concrete slab, since it has no compressive strength. Use high-density foamboard.

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