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mf915 05-19-2006 12:18 PM

i messed up a section of my subfloor
1 Attachment(s)
i think i messed up something. Any easy fix here or it is not a big deal ??? See image attached.

the subfloor is 3/4" osb on 24" OC. I didn't see any visible gap between the two OSBs. So I started using a circular saw and cutting through the gap (about 12" long), in the attempt to create a gap. Why did I do that ? please don't ask. Wish i had not done it.

Now when I step over the gap i created (redline in pic), that section of the OSB flexes. The rest of the floor is fine. Am i being too paranoid here ? Or did i really mess up something bad ?

I'm putting laminate flooring over the subfloor....

redline 05-19-2006 04:43 PM

I did not see the pictures but is the seam over a joist?

Do you have access to the seam from below?

If you have access from below then you can bridge the seam with a 2X4 or 2x6 and then screw from above. Run the board the length of the seam and attach.

mf915 05-19-2006 08:15 PM

Unfortunately i don't have access from the bottom. It's the bedroom upstairs. I don't want to rip everything open to fix it....

Here's the scenario. Two OSBs in horizontal direction. Joists (^) are running in vertical direction. I cut between the OSBs in the attempt to create a gap (xxxx). Now when i step over the xxxxx area, it flexes. Before I made the gap, it did not flex at all.

Since I am putting laminate flooring on top, i don't know if i have to worry too much. I wonder if I can put some cement based leveling compound over the xxxx area ... would that help ??

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Teetorbilt 05-19-2006 09:55 PM

Try Tiger Hair or Bondo to fill the gap. Use enough to force it all of the way through it and don't mix it too hot or it will shrink. Bondo shrinks more. Once bridged by the flooring, it should be no problem at all.

Bonus 05-20-2006 12:09 AM

Most likely the osb is tongue and groove, and when you applied the skilsaw you cut the tongue off which is allowing it to flex. You could cut a 2"x12' rectangle out (at your cut) and then insert two pieces of plywood about 8" long and 4" wide, one at each end of the rectangle but under the floor and screwed from above. Then reinsert your rectangle in the cavity thus made and screw it in. This will support the cut you made. Or, you could ignore it, put the laminate over it and forget about it. Particularly if the laminate will be perpendicular to the cut.

mf915 05-20-2006 07:11 AM

thanks guys. Didn't know OSBs could have tongue/groove. That makes sense now.

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