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Old 03-20-2012, 10:08 PM   #1
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install laminate wood planks on wavy concrete


i just ripped out the carpet in my basement and was planning to replace the flooring with laminate wood planks. Turns out the floor is wavier than I thought. I've heard about the application of self-leveling compound but am worried about creating lips when treating a large area (really, the entire basement is wavy, 900 sq ft of it).

How do I judge if the floor is in acceptable condition or too wavy for the installation of this type of flooring? I was planning on floating the laminate.

Thanks so much for help!

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Old 03-20-2012, 10:16 PM   #2
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install laminate wood planks on wavy concrete


Use a level or long, straight 2x to even out the worst areas. Install 1 layer of underlayment (Ecostep is a nice product) and then add patches of additional underlayment layers as needed as you install the laminate

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Old 03-20-2012, 10:16 PM   #3
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install laminate wood planks on wavy concrete


You need to be reading the box of flooring or going on the manufactures web site of the flooring to see what's exceptable.
Done wrong and the flooring comes unlocked, gaps open up, and it buckles.
Keep in mind laiminite floor is alway ways a floating floor, and some are not below grade rated so make sure to also look over The info on the companys website.
Even if there below grade rated there's special instrutions when going over a slab floor.
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Old 03-20-2012, 11:14 PM   #4
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install laminate wood planks on wavy concrete


Upload a photo of your floor, if you had carpet there already,..... most likely will be laminate safe as well
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Old 03-20-2012, 11:24 PM   #5
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install laminate wood planks on wavy concrete


So not true, carpet could careless if the floor is flat or level. It's flexable and will conform to whatever it's layed over. You could lay it over a barrel if you wanted to.
Laminite is flat and hard. Lay it on a wavy subfloor and it's going to sound hollow, flex, cause stress on the T & G, wear out the T & G and come unlocked.
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Old 03-21-2012, 01:19 PM   #6
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install laminate wood planks on wavy concrete


The laminate is rated for all grades, including below grade. However, I cannot find information about maximum slope. I saw a video where one said that no more than 3/16" per 6' slope is acceptable.

Here's a link to the flooring I bought - we have the same stuff in the upstairs and it's quite good actually:
http://www.homedepot.com/Flooring-La...34/7644255.htm
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Old 03-21-2012, 01:23 PM   #7
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install laminate wood planks on wavy concrete


Flooring could care less if there's a slope, as long as the floor is flat it will work.
Most garages, old porches that someone enclosed later on were build at a slope for water to run off. It does not effect the floor. Having gaps under it from low spots will cause problums.
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Old 03-21-2012, 01:29 PM   #8
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install laminate wood planks on wavy concrete


You're right, I wasn't accurate enough. I meant that I read that there can't be a dip that's deeper than 3/16" over a 6' section.

Anyways, I took a 6' level and just positioned it at random places in my basement. In some cases, it rests on high spots and bridges over dips as deep as 1/4". Those are the spots that I should fill with the self-leveling compound, right?

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