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Sheeting under plywood on Fish house frame

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What is the sheeting called and where can I get it. I seen it on some fish houses. Its black looks to be 4 x 8 sheets and close to 1/8 thick.


I have a trailer/frame being built and would like to put it down first before the pink insulation and 3/4 plywood.

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I believe that you are looking for HPDE.





So, just so I have this correct... you are going to insulate between the cross members and run HPDE under the frame and 3/4 plywood on top??

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No my plan is to lay the HDPE on the top of the frame. Put 1 inch pink insulation on it then 5/8 or 3/4 sanded plywood on top.


Is it better to put the HDPE on the bottom of frame and insulation between the cross members. If I did that I would need to use 2 inch insulation.

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  • 3 weeks later...

What I have seen others do is run 3/4" marine plywood directly on the frame, top that with foam and then use 1/4" subfloor on top of that. You are going to want to make sure that you get the most rigid base on top of the frame.

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