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  1. #1
    Join Date
    Feb 2008
    Posts
    40

    Default flooring underlayment

    I've been told by one flooring contractor that I must install 1/4" voidless 5 ply over the 5/8" AC ply underlayment before installing marmoleum or vinyl or the warranties will be voided. Anyone have experience or thoughts on this? Thanks -- M.

  2. #2
    Join Date
    Jan 2008
    Posts
    1,977

    Default Re: flooring underlayment

    Have the installer give you the product installation guidelines paperwork, then follow the manufacturer's instructions. You can likely find this on the web on the manufacturer's site. I normally underlay with 1/4" on 5'/8" subfloors and anywhere that generally needs smoothing out, but in a good enough substrate I'll skip that and lay the flooring directly. It's a judgement call on my part but I haven't had any problems or calls for repairs yet.

    Phil

  3. #3
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    6,381

    Default Re: flooring underlayment

    My thoughts?

    1. Follow the instructions the manufacturer specified. It's that simple.

    2. If and whenever you need to repair your floor under warranty, have all your paperwork ready.

    3. Having all that is still no guarantee that the manufacturer will stand behind its product. We've seen it before. If there are a lot of claims, companies go insolvent, take their money and run, leaving customers holding a paper guarantee that has zero value.

  4. #4
    Join Date
    Dec 2013
    Location
    Montreal Canada
    Posts
    190

    Default Re: flooring underlayment

    I always like double 5/8 off set glued and screwed.

  5. #5
    Join Date
    Aug 2007
    Posts
    6,963

    Default Re: flooring underlayment

    I've always used underlayment, partly because when it's time to replace it, it will be far easier to do so. Also, every subfloor I've seen was not suitable for a direct install, seams were not flush, gaps, damage, etc., existed. The underlayment insures that the surface is perfect, or as near perfect as possible, for the vinyl to be laid upon.

    But, as was stated above, read the manufacturer's installation instructions and follow those, that is what is most important.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

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