Sloped Roof Snow Load Calculator

Slope 30 degrees.

Sloped roof snow load calculator.

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. R802 10 2 and designed according to the minimum requirements of asce 7 10. 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. Roof slope 0 degrees slope factor.

The boca code recognizes this and allows you to use the horizontal projection of the roof when calculating snow loads. C s 1 uls. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio. 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.

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. If your roof is flat it is more likely to have snow load problems than if it is pitched. You need to use a snow load formula for flat roofs. After you obtain the roof slope factor from those sections in asce 7 10 the balanced design snow load for the sloped roof can easily be calculated using equation 7 4 1.

For the design of an actual structure a registered and licensed professional should be consulted as per irc 2012 sec. Online snow load calculator for buildings with flat or low slope roofs for balanced snow drift and rain on snow surcharge loadings calculator asce 7 05 for structural engineers construction professionals and building planners. Although there s isn t any standard pitch of a roof used on all kinds of sloped roofs you can determine the range of pitches by using a roof angle calculator and by considering factors like the local climate and roofing materials. The easiest way is to push a yardstick into the snow on the roof selecting an area that looks typical of the overall snow depth.

All of the load cases required to fully design an actual structure are not provided by this calculator. S 1 0 1 0 8 1 0 1 1 0 1 1 8kpa s 1 8 kpa s 37 6 psf. Roof snow load nbc 2010 roof snow load nbc 2010 version 0 1 0 september 26 2020. For dead loads you are correct.

The minimum roof pitch for shedding snow is around 30 or a 6 12 or 7 12 slope although this is not a definite as the material of your roof the direction of the snow and wind are some factors that can affect whether or not snow will slide as roofs of as little as 10 have been reported to shed snow.