Roof Rafter Snow Load Calculator

Span calculator for wood joists and rafters also.

Roof rafter snow load calculator.

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. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. R802 10 2 and designed according to the minimum requirements of asce 7 10.

Length of high roof lu. 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. 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 structures such as sheds or barns can be frames with rafters every 24. Horizontal distance from eave to ridge.

All of the load cases required to fully design an actual structure are not provided by this calculator. It also informs you whether you should immediately remove some of the snow or you can wait a little bit longer. Live load psf dead load psf exterior exposure. Ground snow load pg.

Make sure to not wait for too long though. Live load psf dead load psf span calculator for wood joists and rafters available for the iphone. You can also use this roof slope calculator to recalculate the roof pitch from degrees to percents. Length of roof downwind of the snow drift.

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. Figure 7 1 pages 84 85 and table 7 1 page 92. For the design of an actual structure a registered and licensed professional should be consulted as per irc 2012 sec. 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.

If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow. Span calculator for wood joists and rafters available for the iphone. Length of roof upwind of the snow drift. We will explain to you how to determine the roof pitch step by step.

From eave to ridge w. Basing on the roof parameters you specified in the first section our snow load calculator displays the maximum allowable snow cover thickness and snow weight.