QuietWalk underlayment can be used under pad-attached. There is a known rumor that extra underlayment with pad-attached may produce a decoupling of the click-lock mechanism. QuietWalk’s compression resistance exceeds the industry requirement for pre-attached flooring that is greater than 29 psi @50% per ASTM D1667. The high compression resistance assures that the underlayment will not contribute to floor decoupling.
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We plan on installing luxury vinyl plank with pad-attached. The instruction manual says to not add any underlayment or it will void its warranty. I’m afraid what the pad-attached won’t provide the best sound proofing capabilities. What do you guys recommend?
Hi Dennis, the pad-attached underlayment with your luxury vinyl plank only offers very little or no benefit of soundproofing. The pad-attached is usually to help the buyers get an all-in-one solution to help the ease of the flooring installation. If your subfloor is concrete, another con to pad-attached it won’t most likely withstand alkalinity in the concrete. What is alkalinity? Alkalinity is measured by pH from 1-14. Ideally, concrete should have a pH of 7-9 before installing a floor covering; otherwise, the high alkalinity destroys the bond between the adhesive and floor covering. High alkalinity occurs when too much moisture moves through the slab. Yes, the luxury vinyl plank is waterproof however it is not alkalinity proof. Our QuietWalk luxury vinyl underlayment is a dense underlayment that was designed for luxury vinyl planks that are 2mm or thicker. It provides great sound reduction and moisture protection/management backed with our peace-of-mind lifetime warranty. While adding an extra underlayment to your floor may void your warranty, our warranty will cover your floor if the underlayment was determined to be the cause of failure of the floor.