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oleo 10-16-2012 07:21 PM

Raised 1/2" with OSB, noticed some flexing
I am putting laminate flooring throughout the downstairs. I discovered that I had to raise the entryway, living room, and a hallway 1/2" to match up with the dining room and kitchen. I have laid down 1/2" OSB and placed nails along the edges at 8". I have started installing the laminate flooring and my wife saw that when I walked on the centers of the OSB, there is some flexing.

Do I need to nail down the center of the OSB panels? If so, how much? What kind of problems will I be looking at in the future?


JazMan 10-16-2012 08:47 PM


Originally Posted by Oleo
Do I need to nail down the center of the OSB panels?

Well yes, absolutely you have to fasten between the joists, it's only 1/2" thick. Otherwise it's gonna flex as you say. What type of nail are you using? 8" on edges is not enough. I'd go 6 or less and max 8" in the field. Did you offset the seams from the subfloor?


oleo 10-16-2012 09:09 PM

I'm using 2" ring shank nails. All of 1/2" OSB is offset from the sub flooring. I'm pulling up the laminate flooring and putting in nails at 8" everywhere across the entire piece of OSB. I'll start doing the remaining flooring at 6" and add some nails on the 8" panels already done.

Thank you for the reply.

JazMan 10-16-2012 09:29 PM

OK, sounds better. The 2" nails won't hurt, but 1 1/4" is what you needed if the subfloor is 3/4". Leaving an 1/8" between sheets?


oleo 10-16-2012 09:59 PM

yes sir, 1/8"' between each sheet. And thanks for checking up with me.

funfool 10-16-2012 10:55 PM

I would suggest longer nails, would actually suggest screws.
But, I would toss in adhesive to the mixture, literally glue the osb to the current sub floor.
I would use 3" screws to hit the joist and suck em down tight,
That is only for the joist.
If you look at a 3" screw, top 1 1/2" has no threads. will do nothing out in the field away from the joist. Simple 1 5/8" screw would work great for the field.

Point is, put down some dobbs of liquid nails, 3" screws on the joist, 1 5/8" screws in the field, the short screws will act as a clamp and pull the two together as the glue dries.
The osb will become one with the sub floor, is no way without cutting it out you will remove it.

I have 6 penny ring shank nails for my nail gun, I want glue and screws for flooring.

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