How To Figure Snow Load On Roof

For ground snow loads greater than 20 pounds per square foot the roof load is equal to 70 of the product of the exposure thermal and importance factors the ground snow load and 20 pounds.

How to figure snow load on roof.

Calculating roof snow loads w asce 7 10 a walk through on how to calculate roof snow loads per asce 7 10. Length of roof upwind of the snow drift. Find the volume of the snow on the roof the volume of snow on the roof directly relates to how much it will. Pitched roof snow load.

You can also find the load per square meter or square foot of roofing by opening the advanced mode. You get the same load as a flat roof with the same run would get. For example a roof with 3 feet of light snow has an estimated roof load of 60 pounds per square foot 3 ft depth x 20 lb ft2 ft depth density 60 lb ft2. If you want to calculate these values by hand use the following formulas.

The boca code recognizes this and allows you to use the horizontal projection of the roof when calculating snow loads. If you have any concerns as you are determining your flat roof snow load consult with a structural engineer or roofing specialist. Once you know these values our snow load calculator automatically finds the total weight of snow on your roof. You should know the roof weight limits for your barns and outbuildings.

Measure the horizontal distance from eaves to the ridge the point where the roof is tallest and record the result labelled as run obtain the recorded snow load the maximum load expected to accumulate on the ground for your area. Length of roof downwind of the snow drift. Horizontal distance from eave to ridge. How to calculate snow load step one.

As a homeowner living in an area with white winters you need to know how much snowfall. From eave to ridge w. Flat roof snow loads p f. Length of low roof ll.

Flat roof snow load formula. Figure 7 1 pages 84 85 and table 7 1 page 92. Snow load thickness density. Actually with snow you don t get more load along the slope of the rafter.

This is because as snow falls vertically it spreads itself further along a sloping rafter and so accumulates less depth. How to calculate roof snow loads roof snow load calculations. Ground snow load pg. Find the snow density.

If your roof is flat it is more likely to have snow load problems than if it is pitched. The snow load that is applied to our structure is not the ground snow load but in most.