How to insulate and airseal the floor above an unconditioned basement or crawlspace.
58+ Insulating Floor Above Crawl Space
Pics. In those days, common building practice was to insulate the floor above the crawl space and to leave the crawl space's wall vents open, so any moisture. At about $5 per square foot for professional installation, including materials, it add a vapor barrier:
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That's especially true when heating ducts or pipes pass through the space. A crawl space vapor barrier or retarder applied in existing vented crawl spaces will control moisture and protect the insulation and floor joists. Insulating crawl space walls will always take precedence over insulating the floor, but floor insulation can be a valuable improvement for several reasons.
2.6 floors above garages, floors above unconditioned basements or crawlspaces, and cantilevered floors.
Stapling fiberglass batts between joists to the underside of your home's floor presents a number of problems. If your crawl space isn't ventilated, insulate the walls of the crawl space rather than the subfloor of the room above. In those days, common building practice was to insulate the floor above the crawl space and to leave the crawl space's wall vents open, so any moisture. That's especially true when heating ducts or pipes pass through the space.
