Floor truss in crawlspace, holding up first floor. 14” depth. About 20 ft span is my estimate, with about half of it sitting on concrete block, acting as rim joist.

On the spanned portion, there’s a mending plate that has completely separated from the bottom chord. Are there any fixes for this? enter image description here enter image description here enter image description here

  • Are these pictures all of the same side? What does the other side look like - has the mending plate separated there, too?
    – FreeMan
    Feb 16 at 12:07
  • 2
    looks like both sides, see the dent in the wood?
    – Jasen
    Feb 16 at 12:09
  • @FreeMan both sides. Top photo is left side, bottom photo is right side, from the same perspective
    – achao
    Feb 16 at 14:08
  • Are other plates on other trusses coming loose also or am I just seeing things on first picture. Most plates should be tight to the wood.
    – crip659
    Feb 16 at 21:06
  • There is another plate further down that isn’t in this picture that is like half out; i can update with a photo later
    – achao
    Feb 16 at 21:08

Gently remove the old plates and jack or screw the bottom chord tight, then install steel plates with screws. Don't trust the original gussets to hold if you pound them back into place. The new plates should be at least as large and thick as the originals.

enter image description here

1" truss-head screws would be appropriate. Put screws in every hole with good wood behind it.

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  • Where would i put the new steel plate? Over the old one?
    – achao
    Feb 16 at 21:10

Jack the bottom chord back up into position and then hammer the nail plate back into the wood, then reinforce that join by nailing metal strap over it.

Just the straight strap from a coil, run some down each side of the diagonal and across the bottom of the truss, put clouts in all the accessable holes.

  • 4
    You may also want to investigate WHY this happened. It took a considerable amount of force to not only separate the plate from the truss but to bend it as well. This shows signs of being overloaded.
    – jwh20
    Feb 16 at 12:54
  • @jwh20 true...directly above it is the middle of a den/dining room space that measures maybe 11x11ft
    – achao
    Feb 16 at 16:24
  • 1
    These plates are not designed to be hammered on, and one that's already pulled off won't hold well at all.
    – isherwood
    Feb 16 at 20:52

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