Install laminate over non-flat OSB


Old 05-27-18, 07:50 AM
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Install laminate over non-flat OSB

Hi, I'm trying ton install a floating floor for the first time, its gemwoods brand, the Scottsdale collection merlot.

After removing my carpet I discovered that the subfloor is Oriented strand board ,

The surface is NOT smooth at all, plus there are big gaps between each board, so Im wondering if its possible to install the floating floor on top?

so I have to use some sort of self leveling compound to fill the gaps?

as a side note, walking around the naked OSB seems to be a bad idea, it chips so easily!
Thanks in advance for your help and time.
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Old 05-27-18, 09:25 AM
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Floor just need to be flat, those small expansion gaps are not going to matter as long as the two pieces are not uneven.
Now's the time to add more fasteners if there's any squeaking.
How thick is this subflooring. if it's only 1/2" thick I'd be adding another layer of A/C plywood subfloor rated as a bare minimum of 3/8 over it, 1/2" would be far better.
When installing it you never use glue, never have the seams line up with the seams below, never nail into the floor joist.
You want to do your layout so you do not end up with a narrow piece at the end of the row by cutting off some of the first piece,making sure the cut end goes toward the wall not at the butt joint.
OSB should not be chipping very much, without seeing a picture of what your dealing with I'd wonder if it an issue with moisture.
Is there a crawl space below with no moisture barrier on the ground?
Old 05-27-18, 11:47 AM
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Pictures of OSB subfloor

Hi, thanks a lot for the quick response, here are some pictures of my subfloor,

Image gallery, osb subfloor
I'd like to believe is even ,but have not used a level to verify, Im holding a piece of chipped wood in my hand in one of the pics, you can also see the gaps there.

not sure about the thickness of the floor, how can I measure it to determine if I need an extra layer of

not sure about the crawl space either, how can I check that?


Last edited by Felipe.rojod; 05-27-18 at 11:48 AM. Reason: Image link is not click able
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