Split basement needs vapor barrier

Q: My 1920s home has part basement and part crawlspace underneath it, with a partial wall that separates the two sections. Is it a good idea to cover the dirt portion with plastic? Should I extend the wall all the way up so the two sections are separated? --Dan A.

A: It's fine to lay plastic over the dirt portion of the basement -- in fact, it's required by most building codes. The plastic acts as a vapor barrier to prevent ground moisture from getting up onto the wood members and insulation.

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