Ground Vs Roof Snow Oad

Length of high roof lu.

Ground vs roof snow oad.

In our case let s assume that our structure has a flat roof roof slope 5. Purpose of this web site. When discussing snow load with anyone it is crucial to have a clear understanding as to if the load is a ground or flat roof snow load. 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.

Asce 7 drift height calculation. Length of roof upwind of the snow drift. Each state has a listing of building code and applicable guidelines for snow loads as well as details about where the snow load information may be found or purchased. Figure 7 1 pages 84 85 and table 7 1 page 92.

Even when the specification is clear regarding ground snow vs. The purpose of this web site is to provide ground snow load analysis information and data gathered from all 50 states. Ground snow load might seem somewhat confusing until you read the basic premise that is identified in irc section r301 6 which states. Roof snow load and the applicable snow.

Other considerations for sloped roofs can be found throughout chapter 7 of asce 7 10. The basis for the snow load computation in asce 7 05 is the ground snow load. Length of low roof ll. The value used for the ground snow load should represent the snow load that has a 50 year mean recurrence interval or in other words a 2 probability of being exceeded in any given year.

If you live in the us our snow load calculator compares the total weight on your roof with the permissible load calculated according to the standards issued by the american society of civil engineers regarding the minimum design loads for buildings and other structures asce7 16. The snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load. From eave to ridge w. The roof shall be designed for the live load indicated in table r301 6 or the snow load indicated.

The flat roof snow load is calculated using formula 7 3 1. If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow. This issue of live load vs. Ground snow load pg.

Length of roof downwind of the snow drift. Victor staley a building official in the town of brewster mass responds. 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.