On multiple factors including.
Snow load on pitched roof.
Other considerations for sloped roofs can be found throughout chapter 7 of asce 7 10.
This includes the ground snow load for your area terrain exposure roof type pitch and run.
Go to a snow load calculator and enter the information requested.
This will give you the kilogram per square metre psf or pounds per square foot snow load for your 3 12 pitch roof.
The snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load.
You need to use a snow load formula for flat roofs.
The safest way to determine the pitch of an existing roof is to measure from inside your attic using a level tape measure and pencil.
Discount that actual snow loads may exceed them only that the risk of snow load induced failure is reduced to an acceptably low level.
Hipped roofs are often used in complex roof formations with the hips facing different directions.
You may need to create a new login account to use the new calculator.
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.
In our case let s assume that our structure has a flat roof roof slope 5.
Roof snow load is defined as the weight of snow on the roof surface used in design of the building structure ibc 2012.
It is determined based.
Snow load is the additional weight on a roof structure added by snow and ice buildup on the roof.
The flat roof snow load is calculated using formula 7 3 1.
The atc has a snow load hazard tool that can help you identify when a snow load presents a hazard to the structure.
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.
Expressing this in ratio form our sample roof has a 3 12 pitch.
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.
First figure out how deep the snow is piled up there.
Ground snow load value.
If you are building a new roof however consider the climate to determine the correct pitch and proper materials.
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.
Calculating the snow load is crucial to determining if the structure can handle the additional weight of the snow.
