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RE: Diaphragm

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Generally, metal deck manufacturers will publish diaphragm values if the deck can be used as a diaphragm.

The BEMO roofing system of which I am aware is a standing seam metal roof. I am not aware of any standing seam metal roof that can form a diaphragm. That is primarily because of the way standing seam roof systems are attached to the substructure.

Generally, lateral resistance systems are developed with a horizontal truss and eave strut system since you can't use the standing seam systems as a horizontal element.

On some (more expensive) systems a conventional B deck system is installed on the joists and the standing seam system is installed on top of the B deck as the weather system.

Harold Sprague

From: "Ashraf, Mohammed (Qatar)" <mohammed.ashraf(--nospam--at)>
Reply-To: <seaint(--nospam--at)>
To: <seaint-ad(--nospam--at)>
CC: <seaint(--nospam--at)>
Subject: Diaphragm
Date: Sat, 27 May 2006 09:14:22 +0300

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Hello all,

I have building of 107mx60m in plan size and maximum height of 17m.

The roof is of seamless metal deck from Bemo USA or other manufacture.

The metal deck is supported by open web joists. The maximum span of
joists is 22m.

Can I take this deck as rigid diaphtragm?.

Thanks in advance,


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