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Old 11-12-2018, 06:40 PM   #1
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How could I possibly fix this very weak joist?


I don't know when this was done, but boy was it done wrong. I'll keep this short, is there anyway I can fix this?

The upstairs bathroom will need to be renovated at some point but not any time soon.....so do I have any options now, or will this require more serious work?


The floor above this is warped a bit in a few places and I'm hoping to eventually have it fairly level again.
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Old 11-12-2018, 07:32 PM   #2
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Re: How could I possibly fix this very weak joist?


I can't really tell what the problem is.
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Old 11-12-2018, 07:45 PM   #3
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Re: How could I possibly fix this very weak joist?


Have a structural Engineer check it & follow his advice.
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Old 11-12-2018, 07:47 PM   #4
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Re: How could I possibly fix this very weak joist?


If there is a wall directly below it, the notch out is not that big of a deal.
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Old 11-12-2018, 08:07 PM   #5
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Re: How could I possibly fix this very weak joist?


I suppose I should've provided more information.

there is no wall below it, this is a joist out in the middle of the house.

As for what the problem is, there is a massive chunk cut out of the floor joist in the basement, and even though you can't see it in the picture this joist is visibly bowing because of how much of it is missing.
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Old 11-12-2018, 08:43 PM   #6
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Re: How could I possibly fix this very weak joist?


You see a lot of this sort of thing when you remodel old houses. How much access is there? Ideally you cut the compromised joist on either side of the trap, and header it off back to joists on either side. Depending on span of the joists, you might need to double the two joists you are tying into.
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Old 11-12-2018, 08:45 PM   #7
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Re: How could I possibly fix this very weak joist?


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Originally Posted by Killavolt View Post
I suppose I should've provided more information.

there is no wall below it, this is a joist out in the middle of the house.

As for what the problem is, there is a massive chunk cut out of the floor joist in the basement, and even though you can't see it in the picture this joist is visibly bowing because of how much of it is missing.
See the double header with hanger in each side of the hole and done properly the 2 long joists should be doubled up too and the cut joist should have been hung from the double headers.
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Old 11-12-2018, 10:41 PM   #8
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Re: How could I possibly fix this very weak joist?


That beam is toast and you can't sister to it due to the plumbing.

Please consider "abandoning" the compromised joist...

I'd put temporary jack posts under the abused joist on either side of the plumber's happy place. I'd lift the floor to where is has to be and then add two 4 X ? beams (you can double some 2"X?) , on either side of the cut joist, leaving room for the plumbing. Hopefully, the plumbing will allow the "replacement" joists to be around 12" on-center.

When the new joist have been installed (with cross bracing to the original joist to prevent twisting) you can remove the jack stands.



You could box around the plumbing as suggested - but I'd be concerned about taking out the sag in the floor - perhaps jacking up and they boxing would do the job - I'd want to see to be sure - otherwise, I'd follow this plan of adding two joists to correct the sag at the same time.
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Old 11-12-2018, 10:51 PM   #9
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Re: How could I possibly fix this very weak joist?


Neal, i would love to see the rest of that but simply shifting all the load to the neighbor joists is not a good practice and probably does not meet structural requirements in most applications. As in a floor, a live load is usually designed to 30-40psf live and a stringent deflection of L/360. Even if the thing does not actually break, it will be spongy there and creep can cause a dip with time due to higher stress on the neighbor joists.
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Old 11-13-2018, 06:13 AM   #10
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Re: How could I possibly fix this very weak joist?


Domo's suggestion. One way to slip in a new joist is to bevel the top and bottoms opposing ends so that when it is in an angles position, the corners don't hold you up.
Also search joist repairs. There are companies that make metal plates and reinforcements, although what I've seen require tight installs against the lumber. One solution may be not to try straighten the joists, repair and level the floor from above.
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Old 11-13-2018, 06:57 AM   #11
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Re: How could I possibly fix this very weak joist?


How about a different drain so you can simply replace that joist or sister in another?
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Old 11-13-2018, 09:53 AM   #12
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Re: How could I possibly fix this very weak joist?


I'm definitely going to be looking at changing that drain, I feel pretty sure that the drain can be "adjusted" and that the joist never actually needed to be cut.....but the renovators who did this job were there only to do a quick job as quickly and poorly as possible.
I'm pretty sure they were just some random ******* the previous owner pulled off the street.




There's nothing below this joist, it's just an open room, and with the exception of the drain there is pretty good access to be able to fix it, when I can fix it.
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Old 11-13-2018, 10:04 AM   #13
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Re: How could I possibly fix this very weak joist?


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.... I feel pretty sure that the drain can be "adjusted" and that the joist never actually needed to be cut......

You mean like simply turning the trap 90 degrees?
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Old 11-13-2018, 06:02 PM   #14
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Re: How could I possibly fix this very weak joist?


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You mean like simply turning the trap 90 degrees?

ya, something to that effect lol.


whoever renovated the basement clearly had not one single clue about what they were doing.
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Old 11-13-2018, 06:30 PM   #15
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Re: How could I possibly fix this very weak joist?


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Originally Posted by Killavolt View Post
ya, something to that effect lol.


whoever renovated the basement clearly had not one single clue about what they were doing.
If you look straight up at the joist do you see any of that pipe on the other side of the joist?
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