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Re: Wind Load in Commercial and Residential designs

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        The Alberta Building code currently in force is based on the National Building Code of Canada (NBCC) 1995 edition.  It contains the following clause.
"  Loads Not Listed
Where a building or structural member can be expected to be subjected to loads, forces, or other effects not listed in Article, Such effects shall be taken into account in the design based on the most appropriate information available."
        I would expect most other codes that are fit to use would also have some similar clause if only to prevent unscrupulous persons from avoiding good practice simply because "It ain't in the code".
        Hope this helps.
H. Daryl Richardson
----- Original Message -----
Sent: Wednesday, January 31, 2007 7:50 AM
Subject: Wind Load in Commercial and Residential designs

I am designing wood roof truss for commercial and residential buildings. As a general practice of design in the industry, I learned that the truss above 40 feet clear span for a residential building, we need to design as with commercial loading. Also I learned that such a truss can be designed without wind load. That means design a truss with commercial loading and without wind.
Can somebody clarify on this matter. I did not see any guidance in Ontario Building Code, NBCC or IBC.
Ramesh Savaliya, P.Eng.

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