Roof Snow Load Form Ground Snow Load

Medeek design assumes no liability or loss for any designs presented and does not guarantee fitness for use. The snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load. If unbalanced snow loading isn t required or specified the truss designer may enter the 25 psf snow load as a top chord live load tcll set the load duration factor to 1 15 for snow and turn snow loading off completely.

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Overestimation of snow loads can unnecessarily increase the cost of construction.

Roof snow load form ground snow load.

The snow load calculations provided by this online tool are for educational and illustrative purposes only. Snow loads are influenced by elevation general weather and moisture patterns slope direction exposure roof or trail bridge configuration and wind direction and severity. Ground snow loads do not discount that actual snow loads may exceed them only that the risk of snow load induced failure is reduced to an acceptably low level. The calculated ground snow loads are based on data from over 400 climate monitoring stations across washington.

In my region on cape cod we have a ground snow load design of 25 psf which is a greater design load than the live load 12 psf to 20 psf over an entire roof system. In other words on a steep roof less material would be stacked in a concentrated area at one time to avoid having it slide off. Being equaled or exceeded in any given year. In our case let s assume that our structure has a flat roof roof slope 5.

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. Or the 25 psf snow load could be entered as a roof snow load with the unbalanced snow loading option turned off. The flat roof snow load is calculated using formula 7 3 1. This web based application is made freely available courtesy of the advertisements displayed on this page.

Snow weight length width cos pitch snow load the weight of snowis measured in kgor lbs. If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow. 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. 15 ldf is not allowed for snow loads on wood framed or wood trussed roofs basic wind speed.

Other considerations for sloped roofs can be found throughout chapter 7 of asce 7 10. Roof snow load is defined as the weight of snow on the roof surface used in design of the building structure ibc 2012. On multiple factors including. Ground snow load value.

Minimum ground snow load pg. It is determined based. Snow load thickness density the result snow load or the pressure exerted by the snow has the units of kn m or lbs ft. Minimum roof snow load pf.

You can click on the map below to find the design ground snow load for that location. Use our washington ground snow loads map to easily determine the ground snow load for any location in the state of washington.