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unbalanced snow load

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Could someone clarify the following;

According to the UBC-97 1641.3.1,unbalanced snow load shall be considered for multiple gable-roofs having slopes exceeding 16.7%.(if slope exceeds 16.7% the applicable load is 0.5Pf at the ridge and 3.0Pf at the valley)

According to the ASCE-7-98 7.6.3,unbalanced loads shall be applied to multiple gable-roofs having slopes exceeding 1.79%. (if slope exceeds 1.79% the applicable load is 0.5Pf at the ridge and 2.0Pf/Ce at the valley.

If the roof slope lies between 1.79% and 16.7% what will be the applicable snow load? Can the owner of the building select one of the codes? What is the US practice for such case?

Yilmaz Yuva
Structural Engineer













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