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Joined: Oct 2000
Posts: 3,682 Likes: 3
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Joined: Jul 2002
Posts: 8,443 Likes: 3
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3 runs of 4" EMT with 4 - 750 kcmil Alum in each. 100' long pulled loose from ceiling. Conduit was secured every 10' with Minneralac #9 held by a 3" nail I'm glad I wasn't under this when it fell. Someones in trouble, I bet, and rightfully so!.
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Joined: Nov 2005
Posts: 507
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this is the type of situation that gives you shivers as a contractor.
here you are years after an install, and some guy who may or may not work for you anymore, has just given you an incredible headache.
Hopefully the insurance is current.
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Joined: Sep 2002
Posts: 943 Likes: 2
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Joined: Mar 2005
Posts: 169
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The more I see stuff like this the more I shudder. All to save time and a little money. Shoddy and disgusting. Do it right the first time. Someone is in big trouble and rightfully so. Im glad no one was hurt.
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Joined: Jan 2005
Posts: 5,445 Likes: 3
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This just boggles my mind! Now, I might- just might- see this being done if the nails went into solid wood.... but a nail won't even hold itself in sheetrock alone!
Then there's the lack of imagination shown.... I see 4" pipe, I "imagine" the mother of all pulls, and think "heavy." I just can't fathom anyone relying on a simple nail!
I'm amazed it stayed up as long as it did.
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Joined: Dec 2004
Posts: 161
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If only they'd used ring shank nails...
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Joined: Mar 2005
Posts: 1,213
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For structural engineering purposes, a 16D Common nail is rated for 141 lbs of pullout strength in nailing two 2xs together, and 165lbs in nailing 1/2" sheathing to 2xs, IIRC.
The wood looks OK in those photos, so I wouldn't suspect rotting or water. Vibrations or something else must have loosened them over time, causing them to fail. Either way, nails are the WRONG thing to use in that application, no question about it!
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Joined: Jul 2002
Posts: 8,443 Likes: 3
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gideon, If only they'd used ring shank nails... Yeah, I was originally thinking the same thing. A standard nail has nothing really for the wood to grip to. Even if I was going to use nails to hold something like this up (not likely though) I'd at least have the sense to use either an annular ring type or even a "Twist-Nail".
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Joined: Sep 2002
Posts: 943 Likes: 2
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Ring shank me, if the lazy guy had used lags it would not have happened. [This message has been edited by electure (edited 08-07-2006).]
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Posts: 1,803
Joined: March 2005
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