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Old 06-16-2010, 10:25 AM   #1
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Dropped Ceiling attached to metal joist


Hi all,

I'm trying to draw a detail for a dropped ceiling box (not acoustical tile) with drywall that needs to be attached to an existing metal joist. The thing is, the box isn't over a wall in some places, so it has to be framing at the ceiling. The other thing is the joists are up to 17' high and the drop ceiling needs to be at 10' ht. I've searched the internet high and low but I can't find a good detail of how this would work. I guess there needs to be a 2X4 frame box that can be drywalled with lights installed in it, it's just a matter of how do I attach that to the steel joists?

Any ideas or help would be GREATLY appreciated!

Thanks

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Old 06-16-2010, 12:04 PM   #2
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Dropped Ceiling attached to metal joist


Do you have a pic of the steel joists?

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Old 06-16-2010, 02:31 PM   #3
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Dropped Ceiling attached to metal joist


I think I just added an image of the joist drawing...I'm new to this so bear with me.
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File Type: pdf joist.pdf (9.7 KB, 223 views)
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Old 06-16-2010, 04:05 PM   #4
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Dropped Ceiling attached to metal joist


That's a suspended gypsum ceiling, and is typical in commercial construction.

http://www.usg.com/rc/technical-arti...-en-SC2495.pdf
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Old 06-16-2010, 04:11 PM   #5
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Dropped Ceiling attached to metal joist


Yes, but I need to attach a frame to it (up to 7' down) to create a drop ceiling that can be drywalled. I'm not sure if a 2x4 framing would work for something like that and, if so, how do I connect it to the bottom chord of the steel joist?
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Old 06-16-2010, 04:27 PM   #6
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Dropped Ceiling attached to metal joist


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Originally Posted by cadmonkey View Post
Yes, but I need to attach a frame to it (up to 7' down) to create a drop ceiling that can be drywalled. I'm not sure if a 2x4 framing would work for something like that and, if so, how do I connect it to the bottom chord of the steel joist?
Did you look at the diagram in that PDF? That's the USG system (for attaching drywall) but there's other systems by other manufacturers. The systems are hung by 12ga. wire attached at, or near, the web points on the top chord, not the bottom.
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Old 06-16-2010, 04:37 PM   #7
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Dropped Ceiling attached to metal joist


I drew that diagram, it is the existing joists. I want to drop a soffit from it that will span a pretty big distance and have light fixtures hanging from it, will these 12 ga wires support something like that? There are no walls close to it, so the joists will have to bear the full load.
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Old 06-16-2010, 04:51 PM   #8
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Dropped Ceiling attached to metal joist


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Originally Posted by cadmonkey View Post
I drew that diagram, it is the existing joists. I want to drop a soffit from it that will span a pretty big distance and have light fixtures hanging from it, will these 12 ga wires support something like that? There are no walls close to it, so the joists will have to bear the full load.
You're going to have to consult a structural engineer to determine the load capabilities of the joists.
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Old 06-17-2010, 04:31 PM   #9
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Dropped Ceiling attached to metal joist


Ok, so I've worked it out and I'm attaching the detail in case anyone else is looking for something like this. Clearly, you need to consult a structural engineer or contractor before attempting ANYTHING like this. I'm only posting this as a graphical resource.
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File Type: pdf DETAIL 1.pdf (35.8 KB, 237 views)
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Old 06-17-2010, 05:06 PM   #10
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Dropped Ceiling attached to metal joist


Yes, something like that should work. I thought you were refering to a complete suspended gypsum ceiling for individual rooms. It appears that the metal stud work will be attached by some kind of angle attached to the underside of the concrete deck, not the joist?
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Old 06-18-2010, 10:26 AM   #11
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Dropped Ceiling attached to metal joist


Yeah, I had a tough time describing it. A friend of mine sent me something like what I drew; you would have to attach to the concrete slab above with some sort of L-brackets.

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