Note that the state of montana requires a minimum roof snow load of 30 psf be used for design.
Montana ground snow load to roof converter.
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.
All of the load cases required to fully design an actual structure are not provided by this calculator.
For the design of an actual structure a registered and licensed professional should be consulted as per irc 2012 sec.
If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow.
Local codes and ammendments may govern verify with local building department or jurisdiction.
Or the 25 psf snow load could be entered as a roof snow load with the unbalanced snow loading option turned off.
Specified snow load.
Snow loads shall be determined by the building official.
Rain load s r.
If unbalanced snow loading isn t required or specified the truss designer may enter the 25 psf snow load as a top chord live load tcll set the load duration factor to 1 15 for snow and turn snow loading off completely.
S i s s s c b c w c s c a s r.
Importance factor i s.
Pursuant to montana law the minimum design roof snow load after allowed reductions shall be 30 psf.
Ground snow load s s.
The state of montana requires a minimum roof snow load of 30 psf be used for design 2 this minimum value applies to the final roof snow load that is calculated after all coefficients have been applied and it may be revised when justified by a design professional to the satisfaction of the building official.
The snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load.
Local and or state requirements on the ground snow loads or the roof loads subsequently calculated from these values supercede the values provided by this snow load finder tool.
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.
The flat roof snow load is calculated using formula 7 3 1.
Roof snow load nbc 2010 version 0 1 0 september 13 2020.
R802 10 2 and designed according to the minimum requirements of asce 7 10.
In our case let s assume that our structure has a flat roof roof slope 5.
Note that the state of montana requires a minimum roof snow load of 30 psf to be used for design regardless of ground snow load.
