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

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I see under definition of components and cladding page 24 of ASCE7-02, "Elements of the building envelope that do not qualify as part of the main wind force-resisting system."

Wouldn't this exclude the truss as C&C?

On 1/31/06, Wesley Werner <wwerner(--nospam--at)> wrote:
    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.