Accidentally cut the bottom chord of truss. It happens on the corner of the stud and not fully cut through as picture showing. If I would like to fix it, which contractor should I contact? And would the repair make it even worse since there may need to use screws? Great thanks. enter image description here

  • All these truss questions lately are terrifying. But there seems to be some question about whether this is actually a truss. Can you slide a tape measure up there and get the dimensions of the lumber?
    – JimmyJames
    Commented Dec 21, 2020 at 21:23

3 Answers 3


No contractor needed. Cut a piece of 1/2" plywood 3-1/2" X 12", drill 10 screw holes in it, slather it with glue and screw it on there. Might be overkill, but should do the job.

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    Agreed with both Ecnerwal & JACK. That's a pretty minor problem. Like JACK said, if you want to sleep at night and not worry about it, I'd just sister on a piece of plywood like Ecnerwal said and call it a day. Also, it's close to the support so even less of a problem than if it were in the middle of the beam. IMHO, Like Kris said, I wouldn't even fix it. You're fine. Commented Dec 20, 2020 at 15:29
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    Or omit the screws and just clamp it. I'd use an epoxy with bonding fillers, that comes out about ketchup consistency... wet both surfaces, push 'em together, smallest possible wood screws just to get the surfaces to clamp together hard. The screws are irrelevant after the epoxy cures. The epoxy is doing all the heavy lifting. A million years later, a civilization doing archaeology will find bare copper wires, and that thin layer of epoxy. Commented Dec 20, 2020 at 17:45
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    When it comes to peace-of-mind "there is no overkill" (the rest of the quote doesn't apply here)
    – Criggie
    Commented Dec 21, 2020 at 6:25
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    DIY building repairs are how you get your insurance company denying payments if something goes wrong. If that beam is load-bearing and the roof collapses because he did a dodgy DIY job, good luck getting your insurance to pay up.
    – nick012000
    Commented Dec 21, 2020 at 12:46
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    @nick012000 This is a DIY site.
    – Kris
    Commented Dec 22, 2020 at 13:55

If you need to fix this so you can sleep better at night, any carpenter would be able to sister this truss for a repair. In my humble opinion though, no repair is needed. If you look around up there, there' a good chance you'll see notches cut all the way through for cables, conduit, pipes, etc.

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    If the description is accurate, this is a truss so there shouldn't be notches in the flanges at all. Having said that, the picture sure looks like a solid joist, not a truss, so I think you're right that no repair is needed. Commented Dec 21, 2020 at 17:32

A strong-tie splice would work very well here. Here's one in my home that was used to splice beams for a bottom chord.

enter image description here

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