Q: I have a client with an older home on a slab with an uninsulated foundation. In our northern climate, the perimeter of the floor gets very cold in winter. Would insulating the foundation from the outside make a significant difference in how cold the slab gets?
A: Steve Baczek, a residential architect from Reading, Mass., who specializes in building science, responds: Because the edge of the slab links directly to the cold outside air (via the uninsulated foundation), the surface temperatures of the floor and wall materials at the perimeter of the house will be cold as a result. Preventing warmth from...
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