Roof Support Snow Load Wisconsin

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.

Roof support snow load wisconsin.

Wisconsin s uniform dwelling code requires most homes to have a minimum snow load rating of 30 40 pounds per square foot lbs ft 2 with the greater requirement for northern wisconsin. Dwellings shall be designed and constructed to withstand either a horizontal and uplift pressure of 20 pounds. The loads shall be assumed to act vertically over the roof area pro jected upon a horizontal plane. L roof live load including any permitted live load reduc tion.

L live load except roof live load including any per1nit ted live load reduction. Other considerations for sloped roofs can be found throughout chapter 7 of asce 7 10. You can click on the map below to find the minimum roof design snow load for that location. Or the 25 psf snow load could be entered as a roof snow load with the unbalanced snow loading option turned off.

How much snow a roof can hold depends on the type of snow roofline and material among other considerations. The loads shall be assumed to act vertically over the roof area projected upon a horizontal plane. Use our wisconsin roof snow loads map to easily determine the roof design snow load wisconsin administrative code. 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.

Sps 321 subchapter 2 for any location in the state of wisconsin. Roofs shall be designed and constructed to support the minimum snow loads listed on the zone map. It goes without saying that in a warmer climate the snow load probably would be less so you need to check your code book for live loads and dead loads in your region. Agricultural structures are exempt from this requirement.

Snow loads roofs shall be designed and constructed to support the minimum snow loads listed on the zone map. H load due to lateral pressure of soil and water in soil. In addition to estimating the roof loading it s important to know the loading the roof can resist. The flat roof snow load is calculated using formula 7 3 1.

2002 wisconsin enrolled commercial building code. The snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load. Our sample homes are in an area where the snow load is 50 pounds per square foot of roof area treat snow as live 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.

In our case let s assume that our structure has a flat roof roof slope 5. These questions aren t quite so easy to answer because there are several variables.