Michigan Roof Load Requirements

Together owners steven letherer and bernie letherer have over half a century of experience in the truss industry.

Michigan roof load requirements.

According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal. This minimum live load is in addition to the dead load that the roof must bear. Use our michigan ground snow loads map to easily determine the ground snow load 2009 michigan building code. Arch 331 note set 13 1 s2014abn 2.

D dead load l live load l r live roof load w wind load s snow load e earthquake load r rainwater load or ice water load t effect of material temperature h hydraulic loads from soil f hydraulic loads from fluids. A typical roof is expected to support a live load of 20 psf. You can click on the map below to find the design ground snow load for that location. The requirements for an asphalt shingles roof are contained in the international building code.

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. 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. Classes a b and c roofing required by this section to be listed shall be tested in accordance with ul 790 or astm e108. 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.

Ground snow load commonly 10 psf usually roof live load governs unless snow drifts are considered frost heave condition where soil under footing freezes and exerts upward movement on the foundation bottom of footings must be below frost depth to avoid this issue commonly 12 inches in the charlotte and. Class a b or c roofing shall be installed in jurisdictions designated by law as requiring their use or where the edge of the roof is less than 3 feet 914 mm from a lot line. The north zone middle zone and the south zone are identified on the roof load zone map above. Established in 1989 our company is family owned and operated.