The flat roof snow load is calculated using formula 7.3-1: To find the ground snow load, we use section 1303.1700 of the Minnesota Administrative Rules. You can enter this value either as a ratio x:12 or as an angle, whichever suits you better. RECOMMENDED BASIC SNOW DESIGN LOADS Snow Loads by City 1. 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.) The snow load that is applied to our structure is not the ground snow load, but in most cases, the flat roof snow load. Roof pitch. 60 ground snow PSF BELOW LINE 50 PSF 50 ground snow … TOWN LOAD TOWN LOAD Aguilar 40 Idaho Springs 50 Alamosa 20 Ignacio 40 Standard Country | Table. 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. 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. If your roof is pitched, enter the length and width of the flat area covered by the roof. In our case, let’s assume that our structure has a flat roof (roof slope ≤ 5°). 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. You may need to create a new login account to use the new Calculator. 2. Span Calculator for Wood Joists and Rafters also available for the Android OS. Loads are in pounds per square foot. Visit the roof framing page for more information on cutting roof rafters, and visit the roof pitch calculator for … • Alameda County, CA: 0 psf • Dallas County, TX: 5 psf 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 Intuitively, this is the number of inches of snow on your roof in the place where the cover is the thickest. Modify these basic loads for wind, shape of roof, drifting, ice loads, etc. 3. 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. Other considerations for sloped roofs can be found throughout Chapter 7 of ASCE 7-10. Snow cover thickness. Snow … To figure out the load on your roof, take the depth of snow in feet and multiply it by the weight of a cubic foot of snow. psf (pounds per square foot) ABOVE LINE 60 PSF . 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