Floor Joist Damage

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Hp493

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I had an hvac contractor install ductwork and decided that a floor joist was important enough to stand in the way of a return duct. He cut through all but about 3/4” of a 2x10. Needless to say, he’s not working in my house anymore.

I’m looking for a fix to hold me over until I can get a contractor out for a permanent repair. The home is 60+ yrs old so sistering the joist is not an easy option due to the sag over the years. The joist was cut right at the edge of the 3 gang girder or main beam. I was told that I could just put a 2x10x4 on the beam to support the joist. A second could be added for additional support for the joist to rest on.

I did just that but used regular construction screws not thinking about it probably not being a strong enough option. Can I run structural screws through them? I don’t have a pic with the boards up but have attached a pic of the damage to give an idea. Also attached a pic of the screws. Thanks for the help.
 

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Can you add a picture pulling back a bit? It looks like the joist is resting on a beam or the foundation. If so, how much of the full beam is sitting on the beam/wall?
 
Just went into the crawlspace. Pics are tough to get down there so hopefully this helps. The joist rests on the main beam and the cut extends just beyond the beam. The thought was to add what would basically be a ledge board.

Last week I stacked the two 2x10x4 on the main beam using 3” construction screws and a Simpson strong tie just to tie it together. Afterwards I thought about the construction screws not being strong enough and probably should have used nails. Rather than taking it all apart again, I was going to run the 6” structural screws through but didn’t want to risk any issues with the beam itself. I’m not cutting notches or holes in the beam but my knowledge of main beams is limited to what they're used for, not what can be done with them. Thanks for taking the time to help.
 

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I'd think for only one joist this should work with the Headlock screws you used. I might have used Ledgerloks instead.
 
Just went into the crawlspace. Pics are tough to get down there so hopefully this helps. The joist rests on the main beam and the cut extends just beyond the beam. The thought was to add what would basically be a ledge board.

Last week I stacked the two 2x10x4 on the main beam using 3” construction screws and a Simpson strong tie just to tie it together. Afterwards I thought about the construction screws not being strong enough and probably should have used nails. Rather than taking it all apart again, I was going to run the 6” structural screws through but didn’t want to risk any issues with the beam itself. I’m not cutting notches or holes in the beam but my knowledge of main beams is limited to what they're used for, not what can be done with them. Thanks for taking the time to help.
That looks great to me. you will have no problem now. :thumb:
 
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