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<blockquote data-quote="onthewater102" data-source="post: 457721" data-attributes="member: 13702"><p>If you're putting foam under the floor line the cavity with painter's plastic first, pour the foam, then wrap the plastic over the top & put a board atop that to hold it in place all around the cavity. Weigh the board down so the foam expands to fill the cavity. Doing it this way the foam will have the plastic as a vapor barrier, so rainwater etc. can still percolate around it without having an opportunity to saturate it.</p></blockquote><p></p>
[QUOTE="onthewater102, post: 457721, member: 13702"] If you're putting foam under the floor line the cavity with painter's plastic first, pour the foam, then wrap the plastic over the top & put a board atop that to hold it in place all around the cavity. Weigh the board down so the foam expands to fill the cavity. Doing it this way the foam will have the plastic as a vapor barrier, so rainwater etc. can still percolate around it without having an opportunity to saturate it. [/QUOTE]
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