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.

How to figure snow load on roof. Once you know these values our snow load calculator automatically finds the total weight of snow on your roof. Find the snow density. If you have any concerns as you are determining your flat roof snow load consult with a structural engineer or roofing specialist. 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.

From eave to ridge w. 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. Length of roof downwind of the snow drift. Flat roof snow load formula.

Horizontal distance from eave to ridge. This is because as snow falls vertically it spreads itself further along a sloping rafter and so accumulates less depth. The snow load that is applied to our structure is not the ground snow load but in most. Flat roof snow loads p f.

Sloped roof snow. Figure 7 1 pages 84 85 and table 7 1 page 92. Snow load thickness density. If you want to calculate these values by hand use the following formulas.

The effect of snow loads on a structure can have dire. How to calculate roof snow loads roof snow load calculations. Length of high roof lu. Actually with snow you don t get more load along the slope of the rafter.

You get the same load as a flat roof with the same run would get. As a homeowner living in an area with white winters you need to know how much snowfall. How to calculate snow load step one. Find the volume of the snow on the roof the volume of snow on the roof directly relates to how much it will.

The boca code recognizes this and allows you to use the horizontal projection of the roof when calculating snow loads. Ground snow load pg. Length of roof upwind of the snow drift. Length of low roof ll.

If your roof is flat it is more likely to have snow load problems than if it is pitched. You can also find the load per square meter or square foot of roofing by opening the advanced mode.