To calculate Roof Snow Load per Residential Building Code: 0.7 x pg (ground snow load) = pf (roof snow load) Roof Snow Load Examples: Above line: 0.7 x 60 psf = 42 psf Below line: 0.7 x 50 psf = 35 psf . Live Load (psf) Dead Load (psf) Span Calculator for Wood Joists and Rafters available for the iPhone. Online service for determining the characteristic value of the snow load with display of the snow load zones in the United States according to ASCE/SEI. The required roof snow loads for Minnesota aren't clearly spelled out anywhere, but the numbers can be found by using Table R301.2(1) of the Minnesota Administrative Rules. If the snow weighs 10 pounds per cubic foot and there are 1.5 feet on the roof, each square foot of the roof is getting 15 pounds of pressure. You can enter this value either as a ratio x:12 or as an angle, whichever suits you better. Intuitively, this is the number of inches of snow on your roof in the place where the cover is the thickest. S-5!® has updated the Snow Retention Calculator to incorporate many new features, including side-by-side comparisons for ColorGard®, DualGard™, X-Gard™ 1.0, and X-Gard™ 2.0. Snow Loads for Structural Design in Montana (Revised 2004) Gregory P. Theisen Michael J. Keller Jerry E. Stephens Fred F. Videon James P. Schilke December 2004 Snow cover thickness. 2. The snow load that is applied to our structure is not the ground snow load, but in most cases, the flat roof snow load. TOWN LOAD TOWN LOAD Aguilar 40 Idaho Springs 50 Alamosa 20 Ignacio 40 Snow … This table says that roof snow loads equal .7 times the ground snow load. • Alameda County, CA: 0 psf • Dallas County, TX: 5 psf To find the ground snow load, we use section 1303.1700 of the Minnesota Administrative Rules. Roof pitch. The flat roof snow load is calculated using formula 7.3-1: Other considerations for sloped roofs can be found throughout Chapter 7 of ASCE 7-10. You may need to create a new login account to use the new Calculator. Span Calculator for Wood Joists and Rafters also available for the Android OS. 3. If your roof is pitched, enter the length and width of the flat area covered by the roof. Modify these basic loads for wind, shape of roof, drifting, ice loads, etc. psf (pounds per square foot) ABOVE LINE 60 PSF . Roof snow loads for the following counties (in pounds-per-square-foot ground snow load) will give you some idea of the wide range of specifications across the U.S. (Keep in mind that specific locations within these counties may have snow loads modified by local authorities.) Rafter span tables - Use these tables to determine lengths, sizes and spacing of rafters based on a variety of factors such as, species, load, grade, spacing and pitch. 60 ground snow PSF BELOW LINE 50 PSF 50 ground snow … Loads are in pounds per square foot. In our case, let’s assume that our structure has a flat roof (roof slope ≤ 5°). 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