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We have foundation vents, kind of!


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Educate me Scott, what is that plastic doing? Besides blocking the vent. Is it under the sill plate? Looks like it's stretched tight.

I asked the same question to the builder. He said that it is to keep moisture from wicking up into the sill plate. Yes, the sill is treated wood.

I had a termite guy tell me that some builders put the plastic down so that when the CMU is insulated with spray-on cellulose or foam they can come back and remove the plastic and have a clean 6-8" line with no insulation.

Honestly, I do not see any good reason for it. Old school before treated wood was to keep the moisture out of the sill plate.

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