We live in a 1965 bungalow where the attached car porch has been converted to a main floor family room. The family room is about 18’ X 22’ and has two patio doors. In the winter, the furnace runs very frequently (the room has its own forced air furnace). I have checked the ceiling insulation and it is a mineral insulation about 7” deep. The walls seem to have adequate insulation. The ground level family room floor is hardwood flooring supported by 2 X 8 joists resting on a 1 X 2 plywood that sits directly on a concrete pad (no basement). There is no insulation between the concrete pad and the flooring. Please suggest how we should insulate under the flooring.
Answer:
About the best you're going to get out of this is to raise the existing floor about an inch along with the joists it sits on and then insulate and vapour barrier the perimeter underneath it. Now you can pump heat in under it. As long as you have no heat under there you'll have cold feet.
