Port Orchard Snow Load Psf Roof

2 the basic roof snow load factor c b shall be 0 8 except that for large roofs it shall be a 1 0 30 l c 2 for roofs with c w 1 0 and l c greater than or equal to 70 m or b 1 3 140 l c 2 for roofs with c w 0 75 or 0 5 and l c greater than or equal to 200 m where l c characteristic length of the upper or lower roof defined as 2w w l in metres. 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. Only the properly adjusted loads can be used to design roof structural elements.

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See the map usage notes or snow load analysis for oregon part.

Port orchard snow load psf roof. The minimum design roof snow load. Incising assumed for refractory species including douglas fir larch hem fir and spruce pine fir. Pursuant to montana law the minimum design roof snow load after allowed reductions shall be 30 psf. Point load 2 grade and wet service conditions.

Oregon requires a minimum roof snow load of 20 psf pm in asce7 for all roofs plus a 5 psf rain on snow surcharge for many roof types resulting in a 25 psf minimum roof design load for most roofs. Use our roof snow load calculator to determine your design roof snow loads. When using figure 1608 2 for sites at elevations above 1 000 feet 304 m the ground snow load shall be increased from the mapped value by 2 psf 0 095 kn m 2 for every 100 feet 30 48 m above. Assumes 60 psf live load 10 psf dead load l 180 cantilever deflection with 220 lb.

Load limits on the roof of a building. The north zone middle zone and the south zone are identified on the roof load zone. 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. However a south roof load zone home cannot be installed in either a middle or north roof load zone.

In order to stay intact and in place a roof must be able to resist loads both permanent and temporary that are pushing. 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. Roofs are under a lot of pressure. 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.

The ground snow loads to be used in determining the design snow loads for roofs shall be determined in accordance with asce 7 10 or figure 1608 2. If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow. Schilke civil agricultural engineering montana state university august 1989. Assumes 60 psf live load 10 psf dead load l 360 deflection 2 grade and wet service conditions.

Roof loads are a downward vertical force on the home. Snow loads shall be determined by the building official. If you have any questions or concerns about specific ground snow loads within the state of washington please call us at 1 425 741 5555. Roof load live load design is affected by the shape of the roof whether it is flat curved or pitched.