28 Oct '11, 2am

Effective air barrier from uninsulated basement? #green

We are in the process of retrofitting a 1949 house with a full basement in Cottage Grove, OR. We insulated the ceiling of the basement (floor of main dwelling space) with R-30 fiberglass batts. We are planning to install a hardwood floor on top of the existing doug fir subfloor, and are wondering about the best way to proceed with sealing the unheated basement space from the heated main floor. We will likely never finish the basement to be heated, as it will be used for root cellar/cheese cave. Should we put a plastic barrier under the batts? Under the new floor? Both? Or another material? It is definitely drafty from below due the chimney effect. We are also air sealing the attic, but plan on finishing that space eventually to be part of the thermal envelope. At this point we have R-30 batts in the attic floor as well. Anyways, thanks for taking the time.

Full article: http://www.greenbuildingadvisor.com/community/forum/energ...

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