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Hardwood floor installation over warped subfloor?

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Installing an engineered wood floor. Plywood subfloor is warped. Do I put the underlayment first and then roof shingles to fill the deeps or first shingles and then underlayment?
In other words, is underlayment protecting the subfloor or the hardwood?
I’m not positive that using roof shingles is the right way, but I’ve found it online as an alternative to floor leveling compound.
Thanks.

Roof shingles may be an alternative, but they are far from the best method. The best thing to do us to get a 10′ STRAIGHT 2×4 and use that to find peaks and valleys. Fill any valleys over 1/8" deep with floor leveler, and sand any ridges over 1/8". Shingles can move, where the leveler is permanent. This will give much better results. If you are set on the idea of using shingles, put them over the subfloor, then the underlayment over the shingles. Hope this helps.

3 Responses to “Hardwood floor installation over warped subfloor?”

  1. Ten Years Gone Says:

    The purpose of the underlayment is to minimize squeaks from friction and provide a moisture barrier. So the shingles would go under the underlayment.

    How warped is it? Leveling compound would definelty be a better choice, but if it’s so warped you need shingles, you ought to tear it out and put down new sub floor. You’re putting the cash into the floor, but what is underneath is as or more important. Same principle as why padding is more money than the carpet.

    References :

  2. woodtick314 Says:

    Roof shingles may be an alternative, but they are far from the best method. The best thing to do us to get a 10′ STRAIGHT 2×4 and use that to find peaks and valleys. Fill any valleys over 1/8" deep with floor leveler, and sand any ridges over 1/8". Shingles can move, where the leveler is permanent. This will give much better results. If you are set on the idea of using shingles, put them over the subfloor, then the underlayment over the shingles. Hope this helps.
    References :

  3. rob s Says:

    If its more of dips between the joists then you can put shingles there to make a smooth transition to put a sub floor over.The main difference is that you can t do a feather finish like you can w/ most all leveling compounds . Shingles is an old trick used for years..Any questions? e mail me GL
    References :
    20 years in flooring as store owner/installer

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