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Choosing Underlayment for Engineered Hardwood Floor - 2nd Floor Condo

Chris I
5 years ago

I got approval from my HOA to install hardwood flooring on my 2nd floor condo. I was surprised to learn that they didn't have any specific requirements for an underlayment. I am putting in a 1/2" engineered floor (tongue and groove), and I would like to do a floating installation. The subfloor is gypcrete, so I cannot nail it. I was originally planning to use cork, because I've heard it has good acoustic properties and is eco-friendly.


For half the price, I can get MP Global QuietWalk with an IIC of 66 and an STC of 71. There is also Eco Cork Foam from HD that seems comparable: https://www.homedepot.com/p/Eco-Cork-Foam-75-sq-ft-3-ft-x-25-ft-x-0-126-in-Laminate-and-Engineered-Floor-Premium-Plus-All-Inclusive-Underlayment-220000503/204700858


The 1/4" cork has an IIC of 51 and an STC of 54. From what I've read, these numbers can be manipulated, so I don't know what to believe. My main concern is noise for my downstairs neighbor. Does anyone have any recommendatons?

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