Leveling via sistering?


Old 10-22-06, 10:41 PM
Thread Starter
Join Date: Oct 2006
Posts: 3
Question Leveling via sistering?


In my kitchen, 3 adjacent 11'- 2x8 joists are sagging by ~3/4" in the middle. The joists on either side of them are roughly level and at the proper height. Before laying down the subfloor (3/4" Advantech) I need to correct this sag. I'd like to sister some 2 bys along the sags (but not the entire length of the joist) positioned to offset the sag.

My strategy would be:
1) straddle the offending joists with a straight edge on each side of the room in order to identify the sag and create a level line.
2) place either 2x4s or 6s directly under the straight edges
3) sister these 2xs to the sagging joists using construction adhesive and 3" nails.

Any comments or advice would be greatly appreciated.

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Old 10-22-06, 11:31 PM
Join Date: Oct 2006
Posts: 87
go to the following web site: for an excellent piece of sistering floor joists. Hope I got the address right.

Last edited by Jack the Contractor; 10-23-06 at 07:02 AM.
Old 10-23-06, 07:00 AM
Join Date: Dec 1999
Location: South Dakota
Posts: 3,140
The program you have laid out will work just fine. I have done this many times. There are several other methods to level also, but yours will be just fine. Good Luck
Old 10-25-06, 07:22 AM
Thread Starter
Join Date: Oct 2006
Posts: 3
Thanks for the replies--much appreciated.
Old 10-25-06, 07:48 AM
Join Date: Dec 2005
Location: massachusetts
Posts: 67
What is the address for that sistering example? It doesn't show up on the forum page and I'd like to check it out.

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