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Factory Mutual Span

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I am looking for information on the maximum Factory Mutual span for 22 ga.
1-1/2" wide rib roof deck.  My United Steel Deck catalog gives a 6'-0" max
span for the FMS span.  The footnote tells me this is for  class 1
construction.  It refers to FMRC Approval Guide.

Can anybody elaborate of what this means?

__________________________________________________

Richard Lewis, P.E.
Missionary TECH Team
rlewis(--nospam--at)techteam.org