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<blockquote data-quote="thill" data-source="post: 510944" data-attributes="member: 4972">For what it&#039;s worth, I will share a method of mine.On one boat, I laid 1&quot; sheet foam under the floor framing.&nbsp; This allowed complete drainage underneath, since the sheet sat off the hull on top of the ribs.&nbsp;&nbsp; Then I used fill foam from a can to secure/seal it for the pour foam that went on top of that.&nbsp; It worked VERY well.&nbsp;&nbsp; I didn&#039;t want the foam actually glued to the bottom of the plywood, so I poured less than I thought it needed until I learned the expansion rate.&nbsp; I always want to fill the area without having to trim the top, which would expose the cell structure of the foam.&nbsp;&nbsp; So, it is best to mix in small batches, and then mix more if it doesn&#039;t expand quite as much as you want.&nbsp;&nbsp; Even a little drizzle of that stuff can do wonders to seal up an area.This may be a method that can give you the results you are looking for.&nbsp;&nbsp; I wanted good rigidity and floatation without the risk of saturated foam or trapped water underneath.&nbsp; This is my go-to in similar situations.&nbsp;&nbsp; I did other things, to prevent water coming in from the top, but using sheet and pour foam was successful in the lower layers.</blockquote>

[QUOTE="thill, post: 510944, member: 4972"] For what it's worth, I will share a method of mine. On one boat, I laid 1" sheet foam under the floor framing. This allowed complete drainage underneath, since the sheet sat off the hull on top of the ribs. Then I used fill foam from a can to secure/seal it for the pour foam that went on top of that. It worked VERY well. I didn't want the foam actually glued to the bottom of the plywood, so I poured less than I thought it needed until I learned the expansion rate. I always want to fill the area without having to trim the top, which would expose the cell structure of the foam. So, it is best to mix in small batches, and then mix more if it doesn't expand quite as much as you want. Even a little drizzle of that stuff can do wonders to seal up an area. This may be a method that can give you the results you are looking for. I wanted good rigidity and floatation without the risk of saturated foam or trapped water underneath. This is my go-to in similar situations. I did other things, to prevent water coming in from the top, but using sheet and pour foam was successful in the lower layers. [/QUOTE]

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