![]() This influences the melting process and, consequently, the quantity of snow on the roof.īuilding importance. Buildings kept at low temperatures, such as agricultural buildings or heated greenhouses, will have a different roof temperature than a regular detached house. If your roof is partially blocked by obstructions, such as trees or higher structures surrounding your house, less snow will accumulate on it. As you might expect, the roof of a building in a windswept, mountainous area will accumulate a different quantity of snow than a house in the middle of a city. If you want to obtain more exact results, you can also open the advanced mode to take into consideration other factors, including: All the information is taken directly from the ATC Hazards website. Our calculator allows you to choose the state you live in and - in the case of Alaskan locations - the specific city. If you recently moved from California to Ohio, you need to build the house differently unless you want to spend half of your life on the roof, shoveling. The maximum weight of snow allowable on your roof depends mostly on the location of your house. It means that if your house was constructed before 1988, it might not comply with these regulations - in such a case, be sure to take the results from this calculator with a large pinch of salt! These standards were first published in 1988, and while they are updated from time to time, the calculation process essentially stays the same. If you live in the US, our snow load calculator compares the total weight on your roof with the permissible load calculated according to the standards issued by the American Society of Civil Engineers regarding the Minimum Design Loads for Buildings and Other Structures (ASCE7-16). ![]() The weight of snow is measured in kg or lbs. Snow weight = length × width / cos(pitch(°)) × snow load The result - snow load, or the pressure exerted by the snow - has the units of kN/m² or lbs/ft². If you want to calculate these values by hand, use the following formulas: You can also find the load per square meter or square foot of roofing by opening the advanced mode. Once you know these values, our snow load calculator automatically finds the total weight of snow on your roof. If you're unsure which type to choose, always settle for the wetter types, as they are denser. The density of snow depends on whether it's fresh, wet, wind-packed, or mixed with ice. Intuitively, this is the number of inches of snow on your roof in the place where the cover is the thickest. If you don't know the value, check our roof pitch calculator, which will tell you in a second. You can enter this value either as a ratio x:12 or as an angle, whichever suits you better. If your roof is pitched, enter the length and width of the flat area covered by the roof. ![]() You can enter these values in any units you'd like, including meters and feet. You need to supply the following information: For all other situations click here for quick reference in the code book.To calculate the weight of snow on a roof, use the first two sections of our snow load calculator. applications according to the 2018 International Residential Code. These rafter span tables provide the best reference to quickly and easily determine the maximum span for all grades of southern pine according to the 2018 International Residential Code.
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