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Flat Roof Snow Load Calculation

Easysnowroof
Evaluate the supplied flat-roof snow expression pf = 0.7 Ce Ct Is Pg with Ce = 0.90, Ct = 1.20, Is = 1.0 and ground snow load Pg = 40 psf. Calculate only this expression (no minimum, drift or sliding provisions). What is pf?
  1. A43.20 psf
  2. B25.20 psf
  3. C30.235 psf
  4. D33.60 psf
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Answer: C. 30.235 psf

Equation: pf = 0.7 Ce Ct Is Pg. Substitution: coefficient product = 0.7(0.90)(1.20)(1.0) = 0.756; pf = 0.756(40) = 30.235 psf. Wrong: 43.20 psf drops the 0.7 factor (0.90·1.20·40); 25.20 psf drops the thermal factor Ct (0.7·0.90·40); 33.60 psf drops the exposure factor Ce (0.7·1.20·40).
psf
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