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Message: <blockquote data-quote="thill" data-source="post: 516460" data-attributes="member: 4972">I've had boats with plastic sheet laid before the foam pour, and that worked great.  It doesn't look like you have much depth to work with.  In that case, I would probably fit sheets of closed foam on the bottom and then pour over them.  That will give you drain space and prevent any interaction between the foam and hull.  Then house wrap over the top to prevent any saturation.  (I went with a different brand than Tyvek, one that matched the original better)You should be great for many years with your plan.   I hope it goes great for you!</blockquote>