Replies

1. 
   jiminmin | Nov 20, 2002 05:58pm | #1

   After considering my own question, I think it would be necessary to use 1/2" plywood sleepers 12" o/c for the 3/8" flooring. But then I wonder if I could use good, old fashioned 1/2" fiberboard sheathing, "Biltrite", glued to the floor in full sheets without sleepers as this material does not seem to compress much? If this is possible what would I use between the flooring and the Biltrite as a vapor barrier, plastic,tar paper? jiminminn

1. 
   jiminmin | Nov 26, 2002 10:13pm | #2

   Has anyone floated a floor over extruded foam without sleepers? It comes in 15,25, 40, and 60 PSI. And I was hoping 60 might be enough to support a floor under normal loads( no pianos).

1. 
   BillHartmann | Nov 27, 2002 12:32am | #3

   I did something like this before I knew I was doing. It was for my home office about 10 years ago. In general it has worked ok, but I made some mistakes.

   I used stock home horror store blueboard which I think is the 25 psi. But remember 25 psi is 3600 lb/sf.

   The problem is concentrated loads. I used some realy crappy 3 ply plywood (3/8" ??) which I held down with a tapcons. Then I tried to screw some 1/4" laun over it and then lay some vinyl tiles. The plywood had a problem holding the scews and some of them worked loose under the tiles.

   If I was doing it again and I wanted a true floating floor I would use t&g sub-floor material. And glue it to the foam to make sure that it does not shift.

   Then you could nail your finish floor to it.

2. 
   jiminmin | Nov 29, 2002 07:15pm | #4

   My dilemma is getting max-R value with minimun height increase. My most recent idea would be to seal the slab with oil based paint. Then glue 3/4" 60 PSI extruded foam sheets to the slab without sleepers. Over this I would glue 3/16" luan ply underlayment( if necessary?) Next the manufacturer's recommended underlayment and finally the prefinished, glued, 3/8" plywood floating floor. Does seem feasible?