In these regions, your pole barn roof needs to support snow loads of 60 to 85 or even higher. Ground snow load is defined as the weight of snow on the ground . The rafter ties were clearly pulling away from their rafters because of the tension forces they were experiencing when under snow load. 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. While you may be able to support most snow loads with trusses spaced four feet apart and dimensional lumber for … I h… Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. Wondering how to calculate the number of snow guards needed for your metal roof? Check out our roof pitch snow load calculator to measure your roof's snow load capacity today! Sample Maximum Spans (feet-inches) Douglas Fir or Larch, No.1 or No.2 with 31.3 psf of Snow Loading . Is there a purlin supporting the rafters? The firm offers special expertise in wood and timber framing, and projects combining wood with other structural materials. Consult local building codes for snow load capacity and reference the Span Tables for Joists and Rafters published by the American Wood Council (AWC) As a general rule, roofs that have a high human occupancy rate should be framed with rafters every 16." Please support our sponsors, Thank-you. *Advertisements: This web based application is made freely available courtesy of the advertisements displayed on this page. 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Built something using our calculators? Step 4 - Determine the Flat Roof Snow Load . This table is simply a sample and may not be valid for your region. or 1 in./ft.) Our roof rafter calculator tools are handy for calculating the number of rafters needed, rafter length calculator, lineal feet of rafter, board feed in ridge and sub-facia,and the total board feet in the roof. Let's look at the sample table below which shows maximum rafter spans for a snow load of 31.3 pounds per square foot (psf). Well the time has finally come for me to start placing rafters into position. Please, Zoom out to fit large full scale template images on screen - or to adjust scale to match ruler held against screen. Incised lumber? Span Calculator for Wood Joists and Rafters … You can also use the Wood Beam Calculator from the American Wood Council website to determine maximum rafter and joist lengths. If your roof is 1,000 square feet, the total snow load is 15,000 pounds of snow. 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