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