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toolman33 02-12-2008 12:01 PM

Laminate floor underlayment Question
Greetings! I'm putting down Swiftlock Plus, laminate flooring in my living room. The flooring will be installed on top of concrete. The flooring I bought has a underlayment pad preattached to the back of each board. Since it is being installed over concrete I was thinking of putting down a traditional vapor barrier with underlayment pad underneath the flooring as well to give the floor a little extra give. This would give it two layers of pad underneath it. My question is... is it a mistake to do this? Would 2 thickness's of pad be to much? make the floor to spongy? An thoughts would be appreciated. Thanks

Bud Cline 02-12-2008 02:36 PM

You should check with the flooring manufacturer on that one. Too much padding certainly could be an issue.:)

AtlanticWBConst. 02-12-2008 06:39 PM

I wouldn't suggest putting 2 layers of padding down. If anything, consider installing a 4 mil Poly layer (vapor barrier) over the concrete.

mcvane 02-12-2008 06:53 PM

If you feel that the concrete is cold on your feet (really cold), I would personally put the vapour barrier or any other layers that can warm things up.

Following the advice of 'experts' at some big box stores, they suggested I wouldn't need a vapour barrier below my laminate that I installed on a bedroom above a cold porch. I did install a 'foam type' of padding, but cold air still comes in very easily - the vapour barrier would've helped at least cut the wind-chill down in cold weather.

I'm not a pro-expert, but I would put the vapour barrier down.

toolman33 02-12-2008 07:10 PM

Thank you for your thoughts, I think I am just going to go with a vapor barrier and just use the padding thats on the back of the boards. I would hate to have to rip the floor up because it was too spongy to walk on.

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