Quote:
Originally Posted by Orrin Dean  I don't think I understand the practice of insulating the concrete slab on the foundation. The insulation around the oven walls is necessary for heat retention and structural preservation. But does the insulation under the foundation keep the oven level? Or keep the slab from cracking? Any heaving would crack the foundation with the insulation.
My brother-in-law is working with his town government installing fire hydrants. He was saying from this winter the frost line would be closer to 60"-72". With this factored into the equation, what does the insulation do? Does it keep the ground inside the foundation from freezing? |
I think we have two different questions going on here. Orrin seems to be asking about a anti-frost foundation using insulation board as shown in this link:
ESB: Frost-Protected Shallow Foundations
It sounds interesting, but I don't think anyone here has tried this technique yet, and can speak from experience. So I think the short answer is, I don't understand it either. I can see where a heated building would use the heat from the building to keep the foundations from freezing, but I don't understand how it works with unheated structures.