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Old 01-07-2020, 12:19 PM   #1
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We started the overhead layout for our water lines. The way the steel is set up is a nightmare for running hangers. Tryin to decide whether to hang a ton of unistrut between the beams or just screw ceiling plates into the ribs of the corrugated roof deck. HVAC is shooting 5/16 self tappers in it for their duct hangers so I don't think we would have any issues piercing the roof underlayment. We have to stay very high to not have conflicts with HVAC , electrical, and the fire suppression system. Either way is gonna suck , but ceiling plates would be much faster. What do you gents think? I've attracted a pic. Steel is staggered so we can't have straight runs as is.


Edit : sorry for the sideways pic
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Old 01-07-2020, 02:33 PM   #2
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I hate penetrating a roof system. also your not going to get as strong of a system using sheet metal screws in a roof deck compared to beam clamps.
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Old 01-07-2020, 02:56 PM   #3
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I hate penetrating a roof system. also your not going to get as strong of a system using sheet metal screws in a roof deck compared to beam clamps.


Yes I agree its not ideal and I dont really like to do it. I think we're gonna go the unistrut route. Clamp it to the beam with strut clamps spanning the whole bay and use spring nuts for my clevis hangers.
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Old 01-07-2020, 04:27 PM   #4
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Beam clamps where you can and where you can't use a piece of 3/4" or 1" pipe and attach one side with a beam clamp to the beam. We used swivel hangers on the pipe, threaded rod and your choice of hanger.
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Old 01-07-2020, 04:40 PM   #5
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Beam clamps where you can and where you can't use a piece of 3/4" or 1" pipe and attach one side with a beam clamp to the beam. We used swivel hangers on the pipe, threaded rod and your choice of hanger.

Hahaha my foreman won't allow me to do that , we make fun of the spinkler fitters for hanging pipe from pipe. Like you said we're gonna run beam clamps wherever possible and then span the beams with unistrut. We are going to be the highest trade on site ( no pun intended) haha. Probably go with a set up like this but one piece of strut instead of two because I don't need all that.
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Old 01-07-2020, 07:02 PM   #6
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has way more load capacity than sheetmetal screws, if your inspector/engineer allows them may be a good option

http://www.buildex.ca/admin/pdf/2011...Sell-Sheet.pdf
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Old 01-08-2020, 11:32 AM   #7
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Hahaha my foreman won't allow me to do that , we make fun of the spinkler fitters for hanging pipe from pipe. Like you said we're gonna run beam clamps wherever possible and then span the beams with unistrut. We are going to be the highest trade on site ( no pun intended) haha. Probably go with a set up like this but one piece of strut instead of two because I don't need all that.
Based on the picture and there's nothing in the way one unistrut on top of the truss would of been sufficient.
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Old 01-08-2020, 01:30 PM   #8
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Judging by the picture, NH is allowed above grade?
Why two 1/8th bends rather than a medium sweep 1/4 bend?
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Old 01-08-2020, 01:53 PM   #9
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Judging by the picture, NH is allowed above grade?
Why two 1/8th bends rather than a medium sweep 1/4 bend?

Yes no hub allowed above ground. That pic was from an old job , just for reference. I asked for a short sweep and I got delivered two 1/8 bends.
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Old 01-09-2020, 08:02 AM   #10
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has way more load capacity than sheetmetal screws, if your inspector/engineer allows them may be a good option

http://www.buildex.ca/admin/pdf/2011...Sell-Sheet.pdf

Agree it is an approved system. Still I would not use it. If some thing causes a leak in the roof system, your penetration can be in the line of fire to blame.

Just because you can doesn't mean you should.
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