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Components & Cladding for Wood Roof Trusses

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ASCE 7-98 requires that wood roof trusses be designed for C&C loading with Zones 1, 2 and 3 and overhangs. It seems impractical for the EOR to list all the loads for the truss designers because of the various effective areas for different trusses. About the best that we can do is to reference that the truss designer needs to comply with the C&C requirements of ASCE 7-98. Additionally, our drawings must list: Basic Wind Speed, Importance Factor, Exposure Factor and Internal Pressure Coefficient and minimum dead load (to determine net uplift).

Does anyone else specify C&C loads differently? 

Does the typical truss designer know how to handle this loading or is it done automatically for him? Does the typical truss program take these C&C loads into account? 

Jim K.

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