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The roof or the entire structure can fail if the snow load exceeds the weight the building was designed to shoulder. 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. 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. 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. From our example, our ground load and flat roof snow load were found to be 30 psf and 21 psf, respectively. 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. 780 CMR Commercial Mass State Building Code Table 1604.11 provides snow load for roofs. Consequently, the roof design snow load is taken to be less than the ground snow load. 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. 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. Ground snow loads are converted to top chord live loads when ordering trusses. Provisions on how to calculate the snow drift surcharge for structures can be found in Section 7.8 of ASCE 7-10. Ground Snow Load Values for Ontario and Quebec. “Modern buildings are designed with snow load in mind,” said Dr. Edwin Nagy at the University of Maine Department of Civil and Environmental Engineering. (3) The ground snow load should be 40 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. 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). Use our Roof Snow Load Calculator to determine your design roof snow loads. 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. (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%. 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. They inquire as to "how much snow can my roof support?" The ground snow load p g can be found in Fig. Design loads: Expressed in psf (pounds per square foot). The basis for the snow load computation in ASCE 7-05 is the ground snow load. The result becomes the required zone as it relates to structures built in the area. Table R301.2(1) Climatic and Geographic Design Criteria Ground Snow Load: The ground snow load shall be determined in accordance with the following criteria: Length of Roof Downwind of the Snow Drift: Horiz. Dlubal Software has integrated the ground snow load maps found directly in the ASCE 7-16 with Google Maps Technology to create the Geo Zone Tool available on the Dlubal website. County Roof Snow Loads) loads established are the minimum roof snow load up to the maximum elevation listed. This tool allows a user to set the address of the project location or to click directly on the map. Measure the horizontal distance from eaves to the ridge -- the point where the roof is tallest -- and record the result labelled as "run." Dist. Or if the building was poorly designed or constructed. 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. 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). Ground snow loads do not discount that actual snow loads may exceed them, only that the risk of snow-load-induced failure is reduced to an acceptably low level. 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. Length of Roof Upwind of the Snow Drift: Length of Low Roof, LL: ft. Ground Snow Load (Pg) This edit box is used to define the Ground Snow Load for the Building or Shape. The equation for converting ground snow load, p g , to roof snow load, p f , is ASCE 7-05 equation 7-1. 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. Ground and Roof Snow Loads for Idaho - 1986 This report was compiled by Ron Sack and A. Sheikh-Taheri through years of research. B. 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. This equation includes factors that take into account exposure and building heat loss. 2010 Ground Snow Load Table for Ontario. For example, consider a roof with a run of 12.2 metres (40 feet). A grace period is being offered until the end of October 2020. from Eave to Ridge, W: ft. Horizontal Distance from Eave to Ridge: Type of Roof 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. If you need to gather ground snow load data programmatically, please consider our API Service. counties list ground snow load, some list roof snow load and some don’t specify what their snow load is. 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). Based on an expected ground snow load of 30 psf, the snow load on our theoretical 3:12 roof is 18.9 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. While there is one roof snow calculated (or specified by code) it covers the uniform application only. 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. 2005 Ground Snow Load Tables. One way to estimate snow load on a roof is to go to an area on the ground nearby the shed or barn. Please review our State Snow Loads page to investigate state specific snow load requirements. For areas not listed within Table 1-C the following shall be used when calculating the site specific snow load: 1) Ground Snow Load. It was released in 1986 by the Department of Civil Engineering at the University of Idaho. 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. The paper also advances snow reliability assessment procedures through the proposal of a new model for the ground-to-roof conversion factor needed for quantifying roof snow loads as a function of ground snow loads. 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. 4 to the National Building Code of Canada gives detailed design information. Ground snow load is used directly in the calculations for various drifting snow cases. 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 Ground Snow Load, pg: psf: Figure 7-1, pages 84-85 and Table 7-1, page 92: Length of High Roof, Lu: ft. Manufacturers should revise their design based on these requirements as soon as possible. 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. Ice density is around 57 pcf. Spatial smoothing and altitude-dependent mapping procedures are described. Paolo Formichi, University of Pisa Italy. 7.2-1 and Table 7.2-1 . 1995 Ground Snow Load Table. Roof snow load calculation. The ground snow load values are provided by a map created by the National Weather Service. Snow load is the downward force on a building’s roof caused by the weight of accumulated snow and ice. use the original ground snow load value in … Any step snow conditions, valley conditions, over-ridge drift conditions, etc. You can click on the map below to find the design ground snow load for that location. Snow Loads 40 psf. Obtain the recorded snow load -- the maximum load expected to accumulate on the ground -- for your area. An equivalent ground snow load of 73 psf may be used to calculate roof loads with no reductions. Snow load is the downward force on a building’s roof by the weight of accumulated snow and ice. Posted at December 21, 2014, in Technical. 2010 Ground Snow Load Table for Quebec. How snow load can damage your buildings. 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