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sjkm 06-13-2009 10:08 AM

Vapor barrier between leveled subfloor and floating floor
I am trying to get my slanted wood floors leveled (about 5.5 " differential) including a vapor barrier, to prevent odors, fumes and hot air from coming up through the floor.
Planning to have the contractor remove the top flooring up to the sub floor, then building the floor to level with sleepers, adding plywood to create a new, level subfloor, then a cross-laminated virgin polyethylene sheet, sealed at the sides with silicone gasket and 1/2 x 2 wood, screwed or nailed into the sheet rock of the walls.

Does anyone have experience with this? The flooring guy seems to be uncomfortable with not being able to nail through the plastic and how to properly attach the top floor. Assuming there should be rosin paper or felt or something of the like between the PE and the top floor. Can the PE be glued to the wood above or below, and if yes, with which product?

Anyone with experience and suggestions? Thanks

poppameth 06-13-2009 11:54 AM

Odd situation. What kind of wood are you putting down? Generally, if something has to be nailed down, you will puncture the membrane. If you are trying to create a solid vapor barrier with no punctures in it you should have chosen a floating floor instead. This would allow for a solid barrier with no risk of breaking the seal since nothing nails down. The material you want to put on top really determines what you are able to do with this situation.

sjkm 06-13-2009 12:17 PM

Floating floor
sorry, I thought I had mentioned that, of course. But it still has to be nailed or firmly attached on one side at least, and it may be much easier for the floor guy to work on something less slippery then a plastic sheet.

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