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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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