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Old 10-26-2014, 08:32 PM   #1
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Have a very small house that in 1947, when it was built was a garage. The 2 floors are a different height. Kitchen and bath got treated 2x4's styrofoam vapor barrier and 3/4" T&G sheathing. The living room floor doesn't give me that luxury. Is it acceptable to lay 3/4" foam and anchor plywood directly to the top of the foam with FH tapcons? Thanks in advance.
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Old 10-27-2014, 07:17 AM   #2
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I've done exactly what you are planning---I sure had my doubts about the life of the floor---however,after 12 years,it is still perfect----covered with ceramic tile---in an unheated sun porch--
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Old 10-27-2014, 09:28 AM   #3
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I've also done it in a kitchen in a slab home.
It broke the thermal barrier so the floors are warmer and it's rock solid.
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Old 10-29-2014, 01:32 AM   #4
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It is perfectly fine, you can apply plywood directly to the top of the foam.
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Old 10-29-2014, 02:02 AM   #5
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I can see how the plywood on top of the foam would be really stiff. The plywood would do a great job is distributing the weight.

If one was concerned about deflection....going to 1 1/8" T&G would be a significant improvement. I have 1 1/8" T&G on my second floor. It's about par to walking on cement.
Even if you are on the right track, you will still get run over if you just sit there.

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