A great deal of confusion currently exists among engineers architects recreation specialists and maintenance personnel concerning the proper snow loading to use for the design and maintenance of trail bridges building roofs and other structures in mountainous high snow load areas.
Montana roof snow load.
Why snow load information.
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.
In areas of the state outside of certified local government jurisdictions the design snow load shall be based on the ground snow loads developed in snow loads for structural design in montana authored by f f.
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.
Note that the state of montana requires a minimum roof snow load of 30 psf be used for design.
Montana ground snow load finder.
46 psf per snow loads for design in montana f f.
Roof snow load.
You can click on the map below to find the design ground snow load for that location.
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.
Local and or state requirements on the ground snow loads or roof loads supercede the values provided by this tool.
Schilke civil agricultural engineering montana state university august 1989.
Based on 100 year 1 hour rainfall of 1 22 inches frost depth 3 ft 1 story building 4 ft 2 story building.
Basic ground snow load.
40 psf roof design.
In areas of the state outside of certified city county and town jurisdictions the design snow load shall be based on the ground snow loads developed in snow loads for structural design in montana civil engineering department montana state university 2004 revised edition.
If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow.
The minimum design roof snow load.
Snow loads for structural design in montana revised 2004 gregory p.
Snow loads shall be determined by the building official.