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. 3. 2. • Alameda County, CA: 0 psf • Dallas County, TX: 5 psf If your roof is pitched, enter the length and width of the flat area covered by the roof. 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. 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. Visit the roof framing page for more information on cutting roof rafters, and visit the roof pitch calculator for … 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. The snow load that is applied to our structure is not the ground snow load, but in most cases, the flat roof snow load. Span Calculator for Wood Joists and Rafters also available for the Android OS. 60 ground snow PSF BELOW LINE 50 PSF 50 ground snow … 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 . Use only within immediate vicinity of given town, particularly if ground elevation changes noticeably. 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 Roof pitch. 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. 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. In our case, let’s assume that our structure has a flat roof (roof slope ≤ 5°). psf (pounds per square foot) ABOVE LINE 60 PSF . You can enter this value either as a ratio x:12 or as an angle, whichever suits you better. Loads are in pounds per square foot. This table says that roof snow loads equal .7 times the ground snow load. Live Load (psf) Dead Load (psf) Span Calculator for Wood Joists and Rafters available for the iPhone. The flat roof snow load is calculated using formula 7.3-1: Snow cover thickness. Modify these basic loads for wind, shape of roof, drifting, ice loads, etc. RECOMMENDED BASIC SNOW DESIGN LOADS Snow Loads by City 1. 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