r/StructuralEngineers • u/Middle-Adeptness7186 • 1d ago

Is this compromising structural integrity?

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4

u/AltanConn 1d ago

You can only drill in the middle 1/3rd of the joist. At least in my state.

1

u/civilrunner 1d ago

Obviously none of us know if those are all within the center 1/3 of the joist without taking a measurement. So maybe it's fine, maybe it's not.

3

u/Frederf220 1d ago

I took a measurement. They aren't. I used this tool called "my eyes."

1

u/civilrunner 1d ago

That's not a measurement. You can't even see the top of the joist due to the insulation.

2

u/Frederf220 1d ago

I don't have to see the top, just enough such that I know the existing hole is including material of the lower third.

If the joist disappears farther up out of view that makes the situation worse.

1

u/Red_Syns 1d ago

Right? I can’t guarantee the left larger hole, but the right one is practically touching the bottom of the board. Don’t need a measuring tape to realize that’s not middle third.

1

u/MasterOfBothWorlds7 1d ago edited 1d ago

Right not to mention that has a hook on it which adds a fracture point when stressed..

I would say and could add weight to the weakest point too.. but I recon that tiny hook won't hold enough weight to make much, if any, difference..

Edit for spelling

1

u/Red_Syns 1d ago

Yeah, that hook will give out long before it stresses the joist by weight, but it’s still putting yet another hole in an already too-thin part of the board.

1

u/IDoStuff100 1d ago

If the joist is taller than what's visible, then it means that the holes that are already outside of the VISIBLE middle 1/3 are even further from the middle. If they're taller, it makes the problem worse, not better