The ground snow load p g shall be indicated.
Roof snow load map.
The ground snow load p g shall be indicated.
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The north zone middle zone and the south zone are identified on the roof load zone map above.
Snow exposure factor c e.
0 7 x 60 psf 42 psf below line.
Sliding snow from a sloped roof.
Psf pounds per square foot above line 60 psf.
In areas where the ground snow load p g 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.
In our case let s assume that our structure has a flat roof roof slope 5.
Oregon snow load map provide feedback.
This is considerably less than the 25 psf that the old codes required.
0 7 x pg ground snow load pf roof snow load roof snow load examples.
Other considerations for sloped roofs can be found throughout chapter 7 of asce 7 10.
Flat roof snow load p f.
Schilke civil agricultural engineering montana state university august 1989.
Flat roof snow load p f.
You can click on the map below to determine the design ground snow load latitude and longitude and elevation for that location.
This downward imposed load on the home is also known as the snow load.
Non shaded cs areas require site specific case studies to establish ground snow loads.
Allowing for the snow that blows off the actual design load can typically be reduced to 14 psf.
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.
The ground snow load map shown below was scanned from the asce 7 10 figure 7 1.
The flat roof snow load is calculated using formula 7 3 1.
Snow load importance.
To calculate roof snow load per residential building code.
Use our asce ground snow loads map to easily obtain the ground snow load figure 7 1 of asce 7 10 for any location in the contiguous united states.
The snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load.
60 ground snow psf below line 50 psf 50 ground snow psf.
0 7 x 50 psf 35 psf.
The minimum design roof snow load.
Roof snow loads are based on the historical records for ground snow loads for a given location however the local building authority should always be consulted to determine the correct roof snow load to use for a given site and application.