Sloped Roof Snow Load Chart

From eave to ridge w.

Sloped roof snow load chart.

Importance occupancy and use of the building. 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. Wind exposure of roof. Load limits on the roof of a building.

For dead loads you are correct. Boca also allows you to reduce the snow load for roofs with slopes greater than 30 degrees presumably because snow will slide or blow off steeply pitched roofs. The sloped roof snow load p s shall be obtained by multiplying the flat roof snow load p f by the roof slope factor c s. P s c s p f the thermal factor c t from table e 3 determines if a roof is cold or warm slippery surface values shall be used only where the roof s surface is unobstructed and sufficient space is.

If you live in the us our snow load calculator compares the total weight on your roof with the permissible load calculated according to the standards issued by the american society of civil engineers regarding the minimum design loads for buildings and other structures asce7 16. Weather you re building a shed roof or adding a dormer to your second story it is important to choose the proper size rafter. Length of roof upwind of the snow drift. The boca code recognizes this and allows you to use the horizontal projection of the roof when calculating snow loads.

A gable roof is a traditional triangle shaped roof that can range from a medium pitch to sharp angled roofs. 2 you must determine the snow load for your region. Roofs are under a lot of pressure. There are several variables to consider when determining the proper rafter size.

This information is found in the code book. Roof snow load is defined as the weight of snow on the roof surface used in design of the building structure ibc 2012. Ground snow load pg. Figure 7 1 pages 84 85 and table 7 1 page 92.

Length of roof downwind of the snow drift. The snow load is treated as a live load when you use af pa s tables. So consider a simple gable roof on a 24 foot wide ranch framed with 2 6 exterior walls and a 1 1 2 ridge. In order to stay intact and in place a roof must be able to resist loads both permanent and temporary that are pushing.

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. Pent roof is a collection of low mono pitched roofs often seen on residential terraces. Ground snow load value. A frame roof is the sharpest gable style roof resembling the shape of the letter a.

On multiple factors including. It is determined based. It is a traditional roof shape employed everywhere from tropical. Horizontal distance from eave to ridge.

This sizing guide for roof rafters will help determine what you need for your small project.