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Thread: Plywood underlayments

  1. #1

    Default Plywood underlayments

    Not exactly a plumbing question, but I figure someone will know the answer:

    I'm installing a plywood underlayment (birch 1/4") on which I'm planning to put vinyl plank flooring.

    If the seams of the underlayment panels are gently butted and sanded smooth, do I need to bother with patching the seam with filler?

    Also, what about the staple holes? Do they need to be patched?
    (important note: I'm not a pro)

  2. #2
    I&C Engineer (mostly WWTP) Lakee911's Avatar
    Join Date
    Aug 2005
    Columbus, OH


    If it says to do it, it's better to err on the side of paranoia and fill 'em...and fill 'em good!

    I don't know what 'vinyl plank floor is' but if it's similiar to the vinyl sheet material, then this was done in a manner you describe in my kitchen by a PO---I tore up the floor. In the high traffic areas, you could see every seam.


  3. #3


    Vinyl planks are strips - not the big 9 or 12ft sheets. They're laid down individually. Because they have a lot of 'natural' seams I'm not sure how well the underlayment seams will telegraph.

    It's not as simple as just being a matter of overkill. Overfilling the seams and holes can cause pops if the material gets pushed out over time.

    I hope I'm just being paranoid.
    (important note: I'm not a pro)

  4. #4
    DIY Junior Member
    Join Date
    Dec 2009

    Default comment

    Pretty well said..!!


    Vinyl Plank Flooring

  5. #5
    Plumber jimbo's Avatar
    Join Date
    Aug 2004
    San Diego


    Even small holes like a staple divot can telegraph through a vinyl floor. I would check with the manufacturer of the vinyl; I suspect their recomendation will be that all holes and seams must be spackled, and sanded smooth.

  6. #6
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default seams

    Parallel seams may telegraph but not be apparent. However, since your underlayment is probably not as long as the room, there will be cross seams and they WILL telegraph through, especially if there is any deviation between the thicknesses where the two panels meet. I might sand and fill those joints.


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