The sides of the slab are more important than under it. The earth is a pretty good insulator, if you get perimeter insulation well below the frost depth after a few years the soil under the slab will stay warm. The heat coming from the center of the earth is substantial and will warm the soil. We had one equipment building permitted in Prudhoe Bay to be built on grade. The air temperature in the building was kept about freezing, but heat from inside the earth, and the lack of cold winter air chilling the subsurface caused permafrost to melt under the building. They added a couple hundred tons of rock every year to keep the floor at ground level.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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