Insulating Crawlspaces & Elevated SubfloorsMarch 7, 2005
I live in a split level home. The mid level is on a crawl space (approx 3.5') with a concrete foundation. The floor is Pergo laminate and I find it very cold. I've gone into the crawl space and pushed pink insulation between the floor joists, but I still find the floor cold. Note, that there is a furnace outlet dispersing some heat into the crawl space. Have I done myself a disservice with the insulation? Would it be better to leave the insulation on the floor on the concrete foundation? Or do you have a better recommendation?
Insulating crawlspaces and elevated subfloors is best accomplished with the use of Reflective Foil Insulation. Follow these instructions:
Insulate the concrete walls with 1 1/2 inch poly urethane rigid insulation. Remove the glass fibre insulation. Apply Reflectix Foil Insulation between the joists 1 inch away from the underside of the plywood or shiplap floor. Replace the insulation batts up against the Reflectix. Insulate between the joists over top of the concrete wall and seal with 6 mil poly sealing with acoustical caulking.
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