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To make it simple, let's use the following assumptions: Ground snow ASCE 7-16 = 35 psf. Ground snow ASCE 7-22 = 50 psf. Check service level roof pressure for an identical 4ft high snow drift. Density = 0.13pg +14 18.55 pcf (ASCE 7-16) 20.5 pcf (ASCE 7-22) Drift pressure = load factor ...

ASCE 7-22 updated the ground snow load map to reflect ultimate design loads, which increased the values. At the same time, the service-level load combinations now apply a 0.7 multiplier to snow loads. My concern is with how snow drifts are calculated. Drift loads are based on the drift height and the ...