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Old 01-17-2012, 02:39 PM   #1
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Shimming 4x10 joist to level


I have a 16 foot wide by 27 foot long family room, with beams at 8 feet, that someone sistered 2x10 joists to strengthen. The problem is one 8 foot section has a dip in the middle. Rather than sister a third set of 2x10s, I thought about removing the sub-floor in the low area and adding a 4 inch wide shim to level it. I would screw and glue it. I would then either re-screw the sub-floor or put on a new sub-floor.
Ideas?
Thanks in Advance,

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Old 01-17-2012, 02:48 PM   #2
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Shimming 4x10 joist to level


I had a hard time understanding exactly the framing you described, can you post a diagram, else try to explain it differently. Remember, I can't see your house, so I can't tell what the 2x10 was sistered to, and I am not clear what size your beams are, and whether the problem is that the beam has a dip, or one of the joists has a dip.

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Old 01-17-2012, 03:35 PM   #3
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Shimming 4x10 joist to level


The framing was 2x10, but, someone sistered joists about 10 years ago and now it is 2 2x10s. There were two layers of sub-floors. I have now removed the top layer. The top layer is a combination of both plywood and MDF. The plywood section is the part that is not level, dropping towards the wall. One joist is about 30 years old the sister about 10.
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Old 01-17-2012, 05:47 PM   #4
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Shimming 4x10 joist to level


It is perfectly OK to shim the subfloor, as long as the joists beneath are in good condition. Or you can leave it the way it is, and live with an out of level floor.
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Old 01-18-2012, 07:12 AM   #5
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Shimming 4x10 joist to level


Thanks Daniel,
I will definitely be validating the joists.

One more thing: Assiming I can remove the nailed on plywood without damage, is it Ok to re-use the plywood? It appears to be pretty good tonge and groove 3/4".
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Old 01-18-2012, 07:32 AM   #6
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Shimming 4x10 joist to level


No problem reusing plywood as long as it is in good condition.

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