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Re: purlin stability (was Cold-Formed Joist Lap Splice Question)

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> From: "Bill Allen" <Bill(--nospam--at)>

> The problem I have is that the metal deck I am used to using, the
> architectural standing seam type that spans about 5'-0" or so (MBCI Ultra
> Deck, et. al) doesn't really laterally brace the purlins to my satisfaction.
> Heck, they don't even touch the purlins. They are "connected" to the purlins
> via a clip that crimps over the rib and fastens to the purlin. You can see
> daylight between the deck and the purlin!

See AISI design guide CF97-1:
A Guide for Designing with Standing Seam Roof Panels

If you haven't seen any of this before, prepare for a rude awakening.

Paul Ransom, P. Eng.
Burlington, Ontario, Canada
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