Roof Snow Load From Ground 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.

Roof snow load from ground snow load.

The flat roof snow load is calculated using formula 7 3 1. The equation for converting ground snow load pg to roof snow load pf is asce 7 05 equation 7 1. If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow. Snow load is not the same as live load and requires a separate input to design the structure correctly.

Snow weight length width cos pitch snow load the weight of snowis measured in kgor lbs. The snow load tab defines design related information regarding the building s or shape s roof snow loads. This equation includes factors that take into account exposure and building heat loss. 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.

The snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load. The basis for the snow load computation in asce 7 05 is the ground snow load. Other considerations for sloped roofs can be found throughout chapter 7 of asce 7 10. Or the 25 psf snow load could be entered as a roof snow load with the unbalanced snow loading option turned off.

In our case let s assume that our structure has a flat roof roof slope 5. This is the load induced by the weight of snow on the structure and may be expressed as ground snow and or specified min. It also includes the importance factor seen in other load types which converts the data.