insulating exposed floors


Old 05-07-01, 11:13 AM
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One section of the ranch home we recently purchased extends about three feet beyond the foundation of the basement. There are two bedrooms within this section, and the floors of these rooms along the exterior wall get quite cold during the winter. All that's beneath them is open air, from what we can tell (the overhang is 2-3 feet above the sloping ground). Some lattice panel runs across this section from the outer edge to the ground. We are planning to replace the lattice because it's in rough shape, and thought--before we put the new panels on--perhaps there's a way to insulate the floors. I know this area has to be a huge energy waster. Any ideas for how to insulate between the floor and ground, keeping in mind the fact this area is above the ground and exposed to air with lattice the only barrier? If so, what type of insulation? How do you secure it beneath the floor? Do you need to create a "false" floor of some kind to close it off for better efficiency? We're extreme novices at such things, and would appreciate any help offered. Thanks so much.
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Old 05-08-01, 11:52 AM
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Put faced insulation in the between the floor joists with the paper side touching the bottom of the floor. Cover with Tyvek stapled to the bottom of the joists to reduce air infiltration. Cover with exterior plywood and paint to match house. Alternately cover with aluminim or vinyl soffit siding for low/no maintenance.

Old 05-19-01, 07:00 PM
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Insulating exposed floors

Extruded polystyrene (e.g. Dow "Blueboard") comes in flat sheets of 2' X 4' or 4' X 8' and varying thicknesses (1/2" to 2" or more) and R-ratings. It is fairly expensive, but it has a good R-rating, and it can be cut to fit the soffit area of your cantilever/overhang and covered with your external plywood. It should not be left exposed to sunlight. Another sheeting insulation similar to Blueboard is foil-backed polyisocyanurate.
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