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123isausernameforme t1_jdydioy wrote

Follow the manufacturer directions for the specific product. I do this for a living, generally I don't use a separate underlayment as I feel it's unnecessary. But directly over a basement slab I'd do whatever the manufacturer recommends.

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Headworx66 t1_jdzlnba wrote

This. I recently fitted some lvt flooring which is about 5mm thick.

As it was going onto concrete subfloor, I decided to add some fibre board under to help it warm things up a little. The instructions said not to do this but I thought the extra warmth would be needed. Well it's fitted now and does have a slight flex to it as you walk on it.

Tbh I wanted a waterproof flooring as it's in the kitchen so the thicker planks weren't really considered, also didn't want to use the glue down stuff as it seemed harder and longer to fit.

I'm kind of regretting it now, but it's not too bad, I just wouldn't do it this way again. I do feel I was right in that the lvt backing is no where thick enough to help take the cold out of a concrete floor.

Really they should make these lvt about 10mm thick to keep the strength in it.

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bomchickawawow t1_je01mlc wrote

They do make it thicker. 4-5 mm thick is from light commercial/residential product lines. Then they have heavy duty/high traffic commercial LVT which can run 8-10mm thick — But you’re definitely paying for it $$$.

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ItsbeenBroughton t1_je0oirg wrote

I installed my LVP and to get the warranty you have to meet the manufacturers requirements. I bought a waterproof tile with padding built into the bottom and thus didnt need a moisture barrier. But, if I had it in a basement, I would have put one down due to moisture content In conjunction with the manufacturer’s instructions.

Most flooring will have a phone number for support, call them, its free.

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