The 20 psf load is equivalent to 14 inches of snow at the design density while the 25 psf load is 17 inches.
Roof design snow load michigan.
There is a special zone in the northeast corner of the state where they get lake effect snow.
Use our michigan ground snow loads map to easily determine the ground snow load 2009 michigan building code.
The building departments there say to use a 30 psf snow load.
The north zone design live load equates to 40 pounds per square foot.
Figure 1608 2 for any location in the state of michigan.
Snow exposure factor ce.
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.
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Why snow load information.
Flat roof snow load pf.
Roof loads are a downward vertical force on the home.
This downward imposed load on the home is also known as the snow load.
The balanced snow load is applied everywhere where the roof structure is located.
The north zone middle zone and the south zone are identified on the roof load zone map above.
The code says to see local conditions in these special zones.
You can click on the map below to find the design ground snow load for that location.
Roof load live load design is affected by the shape of the roof whether it is flat curved or pitched.
In areas where the ground snow load pg exceeds 10 pounds per square foot psf 0 479 kn m 2 the following additional information shall also be provided regardless of whether snow loads govern the design of the roof.
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.
The ground snow load pg shall be indicated.
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.
The state has amended the snow load requirements of the 2009 ibc figure 1608 2 and the 2009 irc figure r301 2 5 table r301 2 1 and table.
Partial unbalanced and drift loading.
However a south roof load zone home cannot be installed in either a middle or north roof load zone.
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.
This includes overhangs and multiple roof levels.
If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow.
