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Posted by Jay Stootzmann on August 27, 2006, 1:16 pm
Yes you should seal the crawl space and yes you should put down a vapor
barrier.
Check the studies done
http://www.advancedenergy.org/buildings/knowledge_library/crawl_spaces/
The technical analyses as to why one should seal a crawl space and place in
there a secure vapor barrier are explained at Advance Energy.
I did it for my own crawl spaces and it improved the air quality in my house
tremendously.
>I live in northern Westchester County, N.Y. My house is built above a
> crawl space with a dirt floor. Last year I had expanding foam
> insulation installed between the floor joists above the dirt floor. The
> height between the dirt floor and the bottom of the floor joists varies
> from a high of about five feet to a low of about six inches (the house
> is built on a slope).
>
> I have heard conflisting theories about ventilating a crawl space. One
> theory says keep vents open in winter and closed in summer. That seems
> counter-intuitive to me.
>
> At one end of the house I have a window opening to the crawl space
> measuring about three feet by three feet. In spring, summer and fall I
> place a screen in the opening. During winter a place a solid door in
> the opening.
>
> At the other end of the house there is a small window (27 x 17). In
> spring summer and fall it is covered by a screen. In winter by a solid
> board.
>
> Here's my question.
>
> Should I cover the two aforementioned windows with the screen, or solid
> covering, in the spring, summer, and fall? What about winter?
>
> Is it necessary to cover the dirt floor with polyurethane?
>
> Thanks.
>
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