Installing LVP on unlevel floor

4 years ago

Hello,

I’m planning on installing Rigid Core LVP in my basement in the coming weeks. The flooring was previously carpeting and the concrete subfloor has a number of areas that are between 1/8 to 1/4 inch out of level. I was wondering if it’s be possible to fix these spots without pouring self leveling cement across the whole basement? Can I pour SLC in only certain spots? I’ve included photos of some the two types of issues that in dealing with. The first is a valley in the floor (about 1/4 inch out of level) and the second is a raised portion of the floor. I have about 4-5 instances of each of these issues across my 1000sqft basement. I would appreciate any guidance you all might have on rectifying these issues before I install. Thanks!

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Comments (3)

SJ McCarthy
4 years ago
Oh Dear. The first pick is a fill able situation. The second situation is NOT. You have some sort of slab issue in the second photo. Those are BIG cracks. To get those dealt with you will need to get rid of the OLD SLC (that thin coat that someone tried to do to 'deal' with a bigger issue then they knew how to handle). Then you need to give the edges of that crack a good scrubbing...find out how crumbly it is. And IF it is stable (a concrete pro will know...a DIYer probably not) you can then fill it...wait for it to cure and then patch over it.

If you have 4-6 of these NASTY issues in your basement (photo #2) then you have more issues than just some 'high' and 'low' spots.

Please take some more photos of the room. Close ups make it hard to understand the real issues.

How old is the house/slab??
Dan Young
Original Author
4 years ago
Thanks for taking the time to write out such a detailed response. The house is from 2001. I’ve included some more photos of the cracks with a measuring tape for reference.
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SJ McCarthy
4 years ago
Ouch. This is a pro job. There is something WEIRD going on with that slab!

When was the last time that slab was assessed? A soil report done?