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Old 02-13-2012, 06:55 PM   #1
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Floor Joist Repair with plywood?


I've discovered a cracked 2 x 12 floor joist under a bathroom subfloor. I'm fairly confident that I can sister a new board to it. Do I have to use a similar 2 x 12 SPF board or can I use a piece of 23/32 BC plywood 12" longer than the crack? The crack starts at the rim joist end and runs along the middle of the joist for about 18". A joist hangar was not used in the construction of the 1985 addition to a 1950ish concrete block and slab ranch home.
Any ideas would be welcomed. Then I can get back to the task of putting down a new, unwater damaged floor.

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Old 02-13-2012, 08:53 PM   #2
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Floor Joist Repair with plywood?


Really need a picture of it.

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Old 02-13-2012, 10:15 PM   #3
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Floor Joist Repair with plywood?


Yes, picture would be nice. But, yes, you can add whatever you want, some responses being better than others, and the longer the better. Ideally, you want to add from support to support, or put a post part way along. What's this about "no joist hanger"?
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Old 02-13-2012, 10:24 PM   #4
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Floor Joist Repair with plywood?


I'd sister it with a full length 2 X 12.
Just a patch as you suggest is not going to have anywhere near strong enough.
If a 2 X 12 has splt that bad I think I would be trying to figure out why it did. To long a span, someone removed a support or the one that's there has failed ect.
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Old 02-14-2012, 03:15 AM   #5
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Floor Joist Repair with plywood?


we've got the same thing right now - we'll sister w/2 2x12s thru bolted for the full length AND install a supporting pier underneath the crack - this is in a crawl space so space isn't an issue,,, you might also consider a flitch beam in this instance
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Old 02-14-2012, 01:54 PM   #6
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Floor Joist Repair with plywood?


Thanks for all the responses guys. I wish I had the time to post a pic. I'm going to use the single 2 x12 bolted thru repair.
I am of the opinion that the crack happened during the OKC quake last year. Wichita isn't to far from OKC and I felt the quake in the house.
I'll post pic's and a situation wrapup later. Got to get to (as the gandaughter says) "fikin' " part.
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Old 02-14-2012, 04:36 PM   #7
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Floor Joist Repair with plywood?


Why are you so worries about a little crack in one joist?

Sounds like a waste of time to "fix".

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Old 02-15-2012, 08:43 PM   #8
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Floor Joist Repair with plywood?


Well the joist is fixed, the floor is down, next the under layment and vinyl. Took pics. They were to big to upload.
I was able to push the joist back together from the basement. I could here the adjacent joists creak as it went up. Glued and cross bolted the sister joist in place. Removed the jack. Nothing snapped so I guess I got it right.
Someone asked about the lack of a joist hangar in the orginal build. I can only hope the original joist was nailed from the opposite of the rim joist. I don't know what Code required in 1985 or if an inspector even looked. I just do the best I can with what i've got.
Lastly, another post asked why I bother fixing a minor crack. After almost 40 years in aircraft maintenance, I have a degree in Murphy's Law. If I didn't fix it now, it would come back to bite me in the a$$ later.
Thanks to all who responded to my plight. I hope I can offer as good as I got. I hear a Bud Light calling me.
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Old 02-16-2012, 07:08 AM   #9
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Floor Joist Repair with plywood?


Take the pictures again, but lower the resolution, or use something like flicker to link them here.
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Old 02-16-2012, 07:13 AM   #10
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Floor Joist Repair with plywood?


You did the right thing by fixing it. Once that one fails the others may have been under add stress and also failed.
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Old 02-16-2012, 09:38 AM   #11
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Floor Joist Repair with plywood?


Quote:
Originally Posted by AndyGump View Post
Why are you so worries about a little crack in one joist?

Sounds like a waste of time to "fix".

Andy.

Agree [ ]
Disagree [x]

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