House on 5 ft slab to save energy?
So I’m talking to someone building a house. His builder has recomended to him that he build his house with a 5 foot thick slab that will be 1000 sq. ft. in area. The frostline is about 3 ft where he lives, and the slab would go under the line and have it’s sides insulated.
The whole idea of this exercise is energy savings, however that is all they are doing to save energy. I could see using the slab as a thermal mass to soak up heat in the winter and send out but the house is going to have one window per room. With the slab doing all the work they can even save money on the windows, and insulation!
Builders argument is, the slab will pull up heat into the house durring winter and suck it up in the summer. I look at that and think, your going to have a 40 degree floor all winter long pulling heat down into the ground, summer maybe it makes sense. But that house is going to take forever to warm up. I also see someone with a brother in the concrete business.