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Flooring Forum - DIY & Professional

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    Underlayment over old, dry concrete and under engineered vinyl planks

    My LVT doesnt have a pad, and the underlayment I have was for laminate. I have seen at Amazon that some have used a 3 mm foam underlayment, which many reported as spongy, but I thought the felt would be less compressable and less spongy, just a bit concerned about moisture over time, I guess...
  2. O

    Underlayment over old, dry concrete and under engineered vinyl planks

    I did a 48 hr moisture test and the concrete is dry (40 years old, but partly below ground level.) I have 5.5 mm engineered vinyl planks. I also have some leftover 3 mm and 4 mm felt underlayment with a vapor barrier attached. I read I should use a vapor barrier over concrete, but the...
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