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exposure
terrain
Boston, MA: 35 psf
Chicago, IL: 25 psf
Little Rock, AR: 5 psf
Houston, TX: 0 psf
Ithaca, NY: 35 psf
Los Angeles, CA: 0 psf
Miami, FL: 0 psf
New York, NY: 30 psf
Philadelphia, PA: 25 psf
Phoenix, AZ: 0 psf
Portland, ME: 50 psf
Other (specify at right):
full exposure
partial exposure
sheltered
B: urban/suburban
C: open terrain
D: flat unobstructed
windswept mountain
Alaska-no trees
normal: 1.0
cold, vented with R>25: 1.1
unheated structure: 1.2
heated greenhouse with R<2: 0.85
I=low hazard: 0.8
II=normal: 1.0
III=high hazard: 1.1
IV=essential: 1.2
roof type
roof surface
roof snow load
hip or gable
mono-slope or flat
1:12 = 4.76 deg
2:12 = 9.46 deg
3:12 = 14.04 deg
4:12 = 18.43 deg
5:12 = 22.62 deg
6:12 = 26.57 deg
7:12 = 30.26 deg
8:12 = 33.69 deg
9:12 = 36.87 deg
10:12 = 39.81 deg
11:12 = 42.51 deg
12:12 = 45.00 deg
<= 5 degrees
other (degrees)
slippery
non-slippery
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unbalanced snow loads:
Checks:
errors:
exposure n/a
W>0
angle >0 and < 90
ground snow load > 0
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