Forum Discussion
valhalla360
Aug 17, 2017Navigator
Done correctly foam sandwich is a great option...done not so correctly...
The problem you face is unless you eliminate the foam, the soft spots will remain. The larger floor is likely fine. You are feeling the upper layer of plywood flex as the foam has degraded under it. Just screwing a joist to the bottom layer won't do much of anything.
The problem you face is unless you eliminate the foam, the soft spots will remain. The larger floor is likely fine. You are feeling the upper layer of plywood flex as the foam has degraded under it. Just screwing a joist to the bottom layer won't do much of anything.
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