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Homeowner Forum / Construction / February 2005Need advice on crawl space insulation
Everything I have read about insulating the floors above a crawl space make a point of saying that the insulation should be placed directly against the floor with no air gaps. Why do they insist on the "no air space"? Not knowing anything about insulation, it seems that an air space between the floor and bat insulation would be good. We are building a house and the floor joists are going to be I beams that are 12" tall. Since the R19-22 bats are only about 6" thick, how is the insulator going to get the bats against the floor and make them stay there? The one insulator I have talked with says that he staples a nylon mesh against the bottom of the joist to hold the insulation in. It seem that would let the bats drop away from the floor and create an air space. Any help and advice will be appreciated. Also, our crawl space walls are concrete block. Should we insulate the walls? If so, what would you suggest? > Everything I have read about insulating the floors above a crawl space > make a point of saying that the insulation should be placed directly [quoted text clipped - 14 lines] > Also, our crawl space walls are concrete block. Should we insulate > the walls? If so, what would you suggest? How you insulate usually depends on where you live and local codes. I do not insulate the underside of floors. I prefer "short basements" to crawl spaces. Insulate the OUTSIDE of your foundation wall. If you can afford it pour a 2" slab over a poly vapor barrier inside your crawlspace. Then, provide a supply and return air run to the crawlspace. Keep it the same temperature as your house. Dry. Warm. A little more expensive but MUCH nicer than a dirt crawlspace. For more information check out: http://www.buildingscience.com/resources/foundations/default.htm or more specifically: http://www.buildingscience.com/resources/foundations/conditioned_crawl.pdf Follow the recommendations and you'll be a very happy camper...er homeowner. "push-up" wires...not to confused with your woman's.. > Everything I have read about insulating the floors above a crawl space > make a point of saying that the insulation should be placed directly [quoted text clipped - 14 lines] > Also, our crawl space walls are concrete block. Should we insulate > the walls? If so, what would you suggest? I share 3D's preferance for sealed crawl spaces. The ground must be well drained. TB |
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