• Alameda County, CA: 0 psf • Dallas County, TX: 5 psf 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. In our case, let’s assume that our structure has a flat roof (roof slope ≤ 5°). Standard Country | Table. TOWN LOAD TOWN LOAD Aguilar 40 Idaho Springs 50 Alamosa 20 Ignacio 40 Use only within immediate vicinity of given town, particularly if ground elevation changes noticeably. RECOMMENDED BASIC SNOW DESIGN LOADS Snow Loads by City 1. If your roof is pitched, enter the length and width of the flat area covered by the roof. 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. The flat roof snow load is calculated using formula 7.3-1: Modify these basic loads for wind, shape of roof, drifting, ice loads, etc. 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. Snow … Intuitively, this is the number of inches of snow on your roof in the place where the cover is the thickest. 2. Roof pitch. 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 . 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. 60 ground snow PSF BELOW LINE 50 PSF 50 ground 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. Live Load (psf) Dead Load (psf) Span Calculator for Wood Joists and Rafters available for the iPhone. 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. Visit the roof framing page for more information on cutting roof rafters, and visit the roof pitch calculator for … Snow cover thickness. 3. To find the ground snow load, we use section 1303.1700 of the Minnesota Administrative Rules. This table says that roof snow loads equal .7 times the ground snow load. You may need to create a new login account to use the new Calculator. psf (pounds per square foot) ABOVE LINE 60 PSF . Loads are in pounds per square foot. 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 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.) Span Calculator for Wood Joists and Rafters also available for the Android OS. 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 Other considerations for sloped roofs can be found throughout Chapter 7 of ASCE 7-10. You can enter this value either as a ratio x:12 or as an angle, whichever suits you better.

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