Michigan Roof Snow Load Requirements

Crane hook loads need not be combined with roof live load or with more than three fourths of the snow load or one half of the wind load.

Michigan roof snow load requirements. The publication is 20 and may be purchased from msu civil engineering at 406 994 2111. The total roof snow load including additional loading effects due to drifting snow sliding snow unbalanced loading conditions and partial loading conditions shall not be less than 40 psf for roofs with a slope less than or equal to 5 degrees and shall not be less than the slope factor cs times 40 psf for roofs with a slope greater than 5 degrees. The north zone design live load equates to 40 pounds per square foot the middle zone equates to 30 pounds per square foot and the south zone equates to 20 pounds per square foot. Other considerations for sloped roofs can be found throughout chapter 7 of asce 7 10.

Purpose of this web site. The greatest nosingprojection shall not exceed the smallest nosingprojection by more than 3 8inch 9 5 mm between two stories including the nosingat the level of floors and landings. Established in 1989 our company is family owned and operated. This downward imposed load on the home is also known as the snow load.

Use our michigan ground snow loads map to easily determine the ground snow load 2009 michigan building code. Flat roof snow loads p f the snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load. Together owners steven letherer and bernie letherer have over half a century of experience in the truss industry. 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 purpose of this web site is to provide ground snow load analysis information and data gathered from all 50 states. In our case let s assume that our structure has a flat roof roof slope 5. 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. Flat roof snow loads of 30 psf 1 44 kn m 2 or less and roof live loads of 30 psf 1 44 kn m 2 or less need not be combined with seismic loads.

The minimum design roof snow load after allowed reductions shall be 30 psf. A nosingprojection not less than 3 4inch 19 mm and not more than 11 4inches 32 mm shall be provided on stairwayswith solidrisers.