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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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