(2) The basic roof snow load factor, C b, shall be 0.8, except that for large roofs it shall be, (a) 1.0 – (30/l c) 2, for roofs with C w = 1.0 and l c greater than or equal to 70 m, or (b) 1.3 – (140/l c) 2, for roofs with C w = 0.75 or 0.5 and l c greater than or equal to 200 m, where, l c = characteristic length of the upper or lower roof, defined as 2w-w²/l, in metres, 1995 Ground Snow Load Table. (3) The ground snow load should be 40 psf. 2016 CBC section 1608.2 (and ASCE 7-10 chapter 7) requires an extreme value statistical analysis of data available in the vicinity of the site using a value with a 2-percent annual Or if the building was poorly designed or constructed. The basis for the snow load computation in ASCE 7-05 is the ground snow load. Use our Roof Snow Load Calculator to determine your design roof snow loads. An equivalent ground snow load of 73 psf may be used to calculate roof loads with no reductions. Ground snow loads are converted to top chord live loads when ordering trusses. The equation for converting ground snow load, p g , to roof snow load, p f , is ASCE 7-05 equation 7-1. Provisions on how to calculate the snow drift surcharge for structures can be found in Section 7.8 of ASCE 7-10. Maps of ground snow loads in IBC and in ASCE 7 indicate a 2 percent probability of the indicated load being equaled or exceeded in any given year. For areas not listed within Table 1-C the following shall be used when calculating the site specific snow load: 1) Ground Snow Load. You can click on the map below to find the design ground snow load for that location. County Roof Snow Loads) loads established are the minimum roof snow load up to the maximum elevation listed. The ground snow load values are provided by a map created by the National Weather Service. Ground Snow Load (Pg) This edit box is used to define the Ground Snow Load for the Building or Shape. The design roof snow load may not be less than 20 psf with rain-on-snow surcharge as applicable. Background and Applications Section 4 - Snow load on the ground The snow load on the roof is derived from the snow load on the ground, multiplying by appropriate conversion factors (shape, thermal and exposure coefficients). The National Building Code of Canada requires buildings to be designed to carry uniformly and nonuniformly distributed snow loads and the "Commentary on Snow Loads" in Supplement No. Please review our State Snow Loads page to investigate state specific snow load requirements. Estimating the weight of snow and ice on a roof is difficult because snow density can range from 3 pounds per cubic foot (pcf) for light, fluffy snow to 21 pcf for wet, heavy snow. It was released in 1986 by the Department of Civil Engineering at the University of Idaho. (1) For general County code information, see CB13-2019 (2) The roof design live load should be 40 psf; but 30 psf could be used for flat roof up to 2%. B. GROUND AND ROOF SNOW LOADS FOR IDAHO By R. L. Sack and A. Sheikh-Taheri Snow loading is the most severe test of roof structures in many parts of the State of Idaho. Any step snow conditions, valley conditions, over-ridge drift conditions, etc. The newly proposed Colorado maps aim to ensure that structures designed across the state achieve the target safety index of 3 defined in ASCE 7. Likewise, unbalanced snow loads — whether the result of wind drifts, uneven melting effects from the sun, or uneven snowfall based on variable protection (usually from trees) — aren't necessarily more likely to cause a roof collapse, but they do stress a roof and its connections in places that balanced loads do not. Design loads: Expressed in psf (pounds per square foot). 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