Laminate flooring over subfloor that is not flat

Old 03-15-06, 02:10 PM
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Laminate flooring over subfloor that is not flat

My husband and I wish to install a laminate floor (or have one installed by a contractor).
The existing floor is sheet vinyl and the sub floor is not flat. The subfloor is supported by steel beams and the wood joists between them have settled, so that now there is a noticable ridge where the beams are (about every 12 feet). We have had the floor stabillized to prevent more settling so it will not get worse.

Does the floor need to be floated with concrete to make it flat or is there a foam or other underlayment that can be used to even it out? Or does anyone have any other suggestions?
What would be the most economical way to do it?

Would one manufacturer be better than another with these conditions?

Any suggestions would be appreciated.
Old 03-15-06, 08:04 PM
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The existing sheet vinyl can be floated with a concrete patching compound, however, follow the instructions to the letter with using the latex additives.

When patching over vinyl, just using a regular floor leveling compound with out the additives will cause the patching compound to release in time, and you'll feel like you're walking on a gravel bed. That sound will transmit to the surface.

One suggestion is to have it floated as above, then follow with a self-leveling compound. It's not cheap, however, probably more affordable than trying to level it with a new plywood subfloor.

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