Routing Mains Underneath vs. In-Between Joists

8/30/2017

When can a fire sprinkler main simply run parallel to and directly underneath structure (such as an open-web joist), and when must is be located in-between joists and hung with trapeze hangers?

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3 Comments

David

8/30/2017 09:54:48 am

The simple answer is you can hang to the side any time.

However it is important to note that you should consult the structural engineer on the specific site/job to make sure that truss can handle the load of your main. generally the smaller mains 4" and below would not have an issue, but they can based on the designed load factors.

David

8/30/2017 09:56:52 am

I forgot to add that based on the structural engineer's design you may or may not need to trapeze that main, or reduce your hanger spacing.

Bill Dust

8/31/2017 08:10:36 am

I 100% agree with David's comments, and this is how we approach it at our office.

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