I have a close friend who owns an HVAC company... he specializes in radiant. I've spoken with him about this subject & according to him, you can install a radiant system with underslab foam insulation & the footing insulation, without the footing insulation, or with no insulation at all. In the latter case, he mentions that when you start up the heat for the season, it will take a while longer to warm the floor but, once warm, the ground under the floor will serve as additional thermal mass and will add to the overall effect. He said that the heat will go down about two feet or so, and that's it, so, no real problem and, as I mentioned, the soil under the slab just turns into several more tons of thermal mass. As far as heat loss around the perimeter, it's true, you will lose a bit there... might need some additional tubing to minimize "cold spots" in the floor near the perimeter walls. If you're worried that frost will be a problem that may affect your posts, one thing you could do is pour a slab completely around the perimeter of the building, width of slab will be equal to the depth of frost you experience in your location. Reason: soil under this slab will not freeze & the frost will move under the slab at an approximate 45 degree angle. So, if your frost line is 36", a 3' wide slab around the building will allow the frost to penatrate 36" deep by the time it gets to the actual building perimeter. This would also moderate the soil temperature at the perimeter of the building and further minimize heat loss at the edges of the slab. Keeps weeds & grass (fire hazard) away from the building as well! HTH ...D
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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