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Old 01-31-2012, 04:37 PM   #1
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Underlayment thickness


I'm in the process of connecting old laminate hardwood flooring to the new flooring i bought (identical flooring) and found that the underlayment for the old floor is about 3/16" thick; however, the underlayment that I am finding on the market that is the closest match is 1/8" thick. Will the 1/16" difference between the two underlayments cause any problems if I install it?

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Old 01-31-2012, 04:49 PM   #2
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Underlayment thickness


Well for one thing there is no such thing as hardwood laminite. It's either laminite which is plastic with an image of real wood or engineered which would be real wood over plywood.
I've never seen any form of plywood under laymant that's 1/8 thick, sure it's not 1/4"
When you have two differnat floors meet like that you going to have to install a transition strip. The floors need to have room to expand and contract or there going to buckle.
The only other way is to remove all the floor you have now and start over.
An 1/8" is no big deal with a transition strip.
You would need a Tee strip.

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Old 01-31-2012, 05:03 PM   #3
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Underlayment thickness


Let me clarify a couple things -

1. the underlayment I am referring to is cellulose fiber with a vapor barrier attached. Lumber Liquidators sells it under the name "Quiet Walk" (http://www.lumberliquidators.com/cat...productId=2011)
2. The floors will not be different. I'm removing carpet and connecting the laminate that is currently in my house to new, identical laminate.
3. the laminate is being installed over concrete
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Old 01-31-2012, 05:09 PM   #4
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Underlayment thickness


Over concrete your going to also need a vaper if your going over concrete.
I'd use the foam padding with the vaper barrier on the back of it before I'd ever use a fiber under lament over concrete.
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Old 01-31-2012, 05:14 PM   #5
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Underlayment thickness


Thanks for the info. So will the difference in thickness between the existing underlayment and the new one be an issue? The difference in 1/16".
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Old 01-31-2012, 05:45 PM   #6
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Underlayment thickness


Only you will notice it.
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Old 02-01-2012, 12:40 AM   #7
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Underlayment thickness


You can get cork in 1/4" would leave you off by only 1/16".

http://www.widgetco.com/cork-underla...FS6FQAod8jcetQ

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