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I'm not sure what you mean by double.
When I started, we used to put poly on the foundation wall up to grade level.
Seemed like a good idea to me. but it is no longer done.
 

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Discussion Starter · #3 ·
one between conc. wall and framing and one between framing and drywall. Also called the moist diaper method.
 

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I'm not sure why they stopped using it.
When we did it , we stopped at grade level.
It was sealed to the wall with silicone, ran down the wall and under the plate.
Not really double though
 
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