The Ground Snow Load ranges from 45 lbs to 65 lbs per horizontal square foot depending on each community and the zone in which it is located. The ground snow load values are provided by a map created by the National Weather Service. Design loads: Expressed in psf (pounds per square foot). 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 Length of Roof Downwind of the Snow Drift: Horiz. For areas not listed within Table 1-C the following shall be used when calculating the site specific snow load: 1) Ground Snow Load. Provisions on how to calculate the snow drift surcharge for structures can be found in Section 7.8 of ASCE 7-10. The basis for the snow load computation in ASCE 7-05 is the ground snow load. The ground snow load p g can be found in Fig. Posted at December 21, 2014, in Technical. The roof or the entire structure can fail if the snow load exceeds the weight the building was designed to shoulder. From our example, our ground load and flat roof snow load were found to be 30 psf and 21 psf, respectively. Ground Snow Load, pg: psf: Figure 7-1, pages 84-85 and Table 7-1, page 92: Length of High Roof, Lu: ft. from Eave to Ridge, W: ft. Horizontal Distance from Eave to Ridge: Type of Roof 4 to the National Building Code of Canada gives detailed design information. It was released in 1986 by the Department of Civil Engineering at the University of Idaho. Please review our State Snow Loads page to investigate state specific snow load requirements. This paper describes the development of a new snow load map for defining ground snow loads for building (roof) design in the state of Colorado. A grace period is being offered until the end of October 2020. Ground snow loads are converted to top chord live loads when ordering trusses. 2010 Ground Snow Load Table for Ontario. The amount of packed snow for the area, over a period of time, will determine a Snow Zone. The ground snow load is pretty much what it sounds like: A predictable load situation that is derived from snowfall records over the years in a particular region (photo 2). This tool allows a user to set the address of the project location or to click directly on the map. Length of Roof Upwind of the Snow Drift: Length of Low Roof, LL: ft. “Modern buildings are designed with snow load in mind,” said Dr. Edwin Nagy at the University of Maine Department of Civil and Environmental Engineering. 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). B. Measure the horizontal distance from eaves to the ridge -- the point where the roof is tallest -- and record the result labelled as "run." You can click on the map below to find the design ground snow load for that location. The Ground Snow Load data along with the Building Geometry will generate factors that convert this Load into the applied Roof Snow, Snow Drift or Sliding Snow Loads. Use our Michigan Ground Snow Loads map to easily determine the ground snow load (2009 Michigan Building Code: Figure 1608.2) for any location in the State of Michigan. This Load is measured in Pounds per Square Foot (English). The result becomes the required zone as it relates to structures built in the area. The ground snow load, P g, shall be indicated.In areas where the ground snow load, P g, exceeds 10 pounds per square foot (psf) (0.479 kN/m 2), the following additional information shall also be provided, regardless of whether snow loads govern the design of the roof: Flat-roof snow load, P f. Snow exposure factor, C e. Snow load importance factor, I. For additional questions or concerns about specific ground snow loads please call us at 1-425-741-5555. 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. 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. Spatial smoothing and altitude-dependent mapping procedures are described. Any step snow conditions, valley conditions, over-ridge drift conditions, etc. Dist. (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%. Economical structural design in these areas requires an accurate prediction of the ground snow, plus an understanding of how the snow is distributed on the roofs. 2010 Ground Snow Load Table for Quebec. Snow load is the downward force on a building’s roof caused by the weight of accumulated snow and ice. Roof snow load calculation. Ground snow load. How snow load can damage your buildings. counties list ground snow load, some list roof snow load and some don’t specify what their snow load is. Snow load is the downward force on a building’s roof by the weight of accumulated snow and ice. Or if the building was poorly designed or constructed. When discussing snow load with anyone, it is crucial to have a clear understanding as to if the load is a ground or flat roof snow load. The equation for converting ground snow load, p g , to roof snow load, p f , is ASCE 7-05 equation 7-1. Based on an expected ground snow load of 30 psf, the snow load on our theoretical 3:12 roof is 18.9 psf. Once the ground snow load at the building site is determined, it must then be converted to roof snow loads according to ASCE 7, with appropriate treatment of exposure to wind, thermal properties of the roof, roof slope, unbalanced snow loads, drifting, and risk exposure. 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. Pf is FLAT ROOF SNOW LOAD – If, as a consumer, your concern is snowfall and you want to upgrade the ability of your building to carry it, THIS is the value to increase. 780 CMR Commercial Mass State Building Code Table 1604.11 provides snow load for roofs. For example, consider a roof with a run of 12.2 metres (40 feet). For the Cornell calculator, this includes the ground snow load for your area (from Step 1), terrain, exposure, roof type, pitch, and run (from Step 2), which is expressed as "W" in the calculator. Ground Snow Load Values for Ontario and Quebec. use the original ground snow load value in … 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. These figures are established by the local jurisdiction, in my case the state of Massachusetts, which lists ground snow loads for each town in the state. (3) The ground snow load should be 40 psf. Ice density is around 57 pcf. The value used for the ground snow load should represent the snow load that has a 50 year mean recurrence interval, or, in other words, a 2% probability of being exceeded in any given year. They inquire as to "how much snow can my roof support?" 1995 Ground Snow Load Table. One way to estimate snow load on a roof is to go to an area on the ground nearby the shed or barn. Ground and Roof Snow Loads for Idaho - 1986 This report was compiled by Ron Sack and A. Sheikh-Taheri through years of research. Snow Loads 40 psf. (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, Ground Snow Load (Pg) This edit box is used to define the Ground Snow Load for the Building or Shape. Site designed and … Manufacturers should revise their design based on these requirements as soon as possible. Consequently, the roof design snow load is taken to be less than the ground snow load. Use our Roof Snow Load Calculator to determine your design roof snow loads. 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. The ground snow load shall be determined in accordance with the following criteria: An equivalent ground snow load of 73 psf may be used to calculate roof loads with no reductions. To find the ground snow load used to determine the design snow loads for buildings and other structures, refer to the online lookup tool or the online map published by the Structural Engineers Association of Oregon (SEAO). These numbers represent the peak snow load that has a 50 yearly mean re-occurrence interval of a 2% probability of being exceeded in any given year. 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. If you need to gather ground snow load data programmatically, please consider our API Service. The design roof snow load may not be less than 20 psf with rain-on-snow surcharge as applicable. 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