A lot of energy can leak through the floor, so it's important to insulate it correctly. R-19 or R-25 fiber glass batts can be installed in floor applications.
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Always install the insulation with the vapor retarder toward the warm
side of the structure in heating climates. In a vented crawlspace, the
warm side is usually up, closest to the floor. |
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The insulation should be installed all the way back at the end of each joist
run so that it touches the band joist. You want complete coverage under
the house. There will usually be a narrow joist space on the walls that runs
parallel to the joist. The insulation should be cut to fit this space.
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There are often both pipes and wires in crawlspace floors and occasionally
a junction box. Water pipes should be insulated and you will need to insulate
carefully around electrical wiring and boxes. |
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Insulation should be placed around cross braces by cutting it and pushing it
between the braces. |
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Once the insulation is in place between the floor joists,
insulation hangers or nylon straps can be used to hold the product in place.
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A 4- or 6-mil. polyethylene vapor retarder should be laid down to completely
cover the ground. Place rocks or bricks around the perimeter to hold it in place. |
