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Re: Roof Design Components and Cladding or MWFRS - ASCE7-02

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But also the MWFRS is defined as " An assemblage of structural elements assigned to provide support and stability for the overall structure.  The system generally receives wind loading from more than one surface. "  These two definitions together seem to say, if the truss itself is taking the force for MWFRS, then it is not C&C.  I do agree that roof decking and connections need to be designed for the C&C.  But it is not clear otherwise.

Wesley, can you point out the page number or reference to the dual design?

On 1/31/06, Keith Pabst <kpabst(--nospam--at) > wrote:
I agree
Keith E. Pabst
-----Original Message-----
From: Wesley Werner [mailto:wwerner(--nospam--at)]
Sent: Tuesday, January 31, 2006 9:22 AM
To: seaint(--nospam--at)
Subject: RE: Roof Design Components and Cladding or MWFRS - ASCE7-02

    In the commentary where it gives definitions, roof trusses are listed under both C&C and MWFRS. My understanding of this dual listing is that trusses must be designed for C&C loading; and if they are acting as part of a frame or some other element in the MWFRS, they must be designed for those loads as well.

Wesley C. Werner

-----Original Message-----
From: refugio rochin [mailto:fugeeo(--nospam--at)]
Sent: Tuesday, January 31, 2006 9:03 AM
To: seaint(--nospam--at)
Subject: Roof Design Components and Cladding or MWFRS - ASCE7-02

I have a small fire to put out.

In design for wind on a roof, in the design of the trusses according to ASCE7-02, are these trusses to be based on Components and Cladding or on MWFRS?  We assume MWFRS because that is the main system for resisting wind.  However, Components and Cladding would indeed be used for connections and roof decks.  What are the engineers takes on these meanings?

Please reply ASAP.
Refugio Rochin, PE
Systems Engineering Ltd.