DIY Chatroom Home Improvement Forum

DIY Chatroom Home Improvement Forum (
-   Flooring (
-   -   Shimming 4x10 joist to level (

Deadskins 01-17-2012 02:39 PM

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.
Thanks in Advance,

Daniel Holzman 01-17-2012 02:48 PM

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.

Deadskins 01-17-2012 03:35 PM

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.

Daniel Holzman 01-17-2012 05:47 PM

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.

Deadskins 01-18-2012 07:12 AM

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".

Daniel Holzman 01-18-2012 07:32 AM

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

All times are GMT -5. The time now is 01:31 AM.

vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

Search Engine Friendly URLs by vBSEO 3.6.1