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Old 03-30-2013, 07:19 AM   #1
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OSB subfloor going down 1 side


I am installing laminate over OSB subfloor
The shape of the subfloor is pretty goo and globally flat with no sag/dip
But there is one portion going down toward 1 inside wall and ends up 1/2" lower than the rest of the floor
It's a progressive slope of 4' approximately

My questions are:
1) Do I need to fix it before installing the laminate? It's not a sag, so I was thinking the laminate could accommodate that slope (laminate installed along that slope, not perpendicular)
2) If I have to fix it, what would be the easiest solution?

I would prefer to leave it as is, otherwise i will have to raise the adjacent room to avoid difference in floor height.....!!!

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Old 03-30-2013, 07:27 AM   #2
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OSB subfloor going down 1 side


Out of level will not effect the flooring.
Not being flat will.
If it was me I'd want to know why it dropped and fix that first from under the house.
Sinking foundation, insect or moisture damage, cracked floor joist all come to mind.

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Old 03-30-2013, 07:34 AM   #3
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OSB subfloor going down 1 side


When we bought the house 4 months ago, the inspector noticed it was going down a little, but also said it was relatively common and not a big issue (he was not concerned about the foundation or big stuff like that). So I trusted him
The house is from 1984,and seems to be good construction....
I could try to put different layer of shims, such as 1/4' plywood shims, but I don't know how to deal with the steps from those shims
Unless I recover the whole floor with 3/4 OSB...
I will have then to deal with difference in height.......!!!!
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Old 03-30-2013, 08:27 AM   #4
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OSB subfloor going down 1 side


Leveling compound is your friend.

Most specs for laminate are 1/4 in 4'. This means you need some help getting it up, hence he floor leveler.
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Old 03-30-2013, 08:45 AM   #5
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OSB subfloor going down 1 side


Is SLC on OSB all right? It's water based product on wood......!!!
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Old 03-30-2013, 08:47 AM   #6
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OSB subfloor going down 1 side


Quote:
Originally Posted by french_guy View Post
Is SLC on OSB all right? It's water based product on wood......!!!
What does the instructions say?
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Old 03-30-2013, 07:55 PM   #7
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OSB subfloor going down 1 side


Well, I don't know
I know SLC for concrete, I already used some recently for my concrete slab
But on OSB, is there any specific preparation other than the regular primer?
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Old 03-31-2013, 07:53 PM   #8
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OSB subfloor going down 1 side


Quote:
Originally Posted by framer52 View Post
Leveling compound is your friend.

Most specs for laminate are 1/4 in 4'. This means you need some help getting it up, hence he floor leveler.
OK, I thought about my problem and I think the easiest way is to use some self leveling compound
To reduce the qty and the weight, I have put a strip of 6 mm plywood on the subfloor (along the wall), approximately 15" wide
I will apply primer on that piece of plywood and the OSB subfloor where SLC will be applied
I do have 1 question:
Is the primer enough to properly apply the SLC? Last thing I want to do is to ruin the OSB.......!!! Is the primer's role to make the SLC adhere on the substrate and in the same time will it protect the substrate (plywood and OSB in my case) from the water inside the compound?

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