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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Today's Featured Article - Experimental Tractors Article - by Danny Bowes (Dsl). Tractor technology appears to have nearly hit it's pinnacle of development. If you agreed with the subtitle, you are rather mistaken. Quite, actually. As a matter of fact, some of the technology experimented with over 40 years ago makes today's tractor technology seem absolutely stale by comparison. Experimentation, from the most complex assembly to the most simple and mundane component, is as an integral a part of any farm tractor's development
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