Roof Support Snow Load Wisconsin

Other considerations for sloped roofs can be found throughout chapter 7 of asce 7 10.

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. The flat roof snow load is calculated using formula 7 3 1. The snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load. Wisconsin has not adopted the international residential code irc and utilizes its own uniform dwelling code udc for all residential structures.

Use our wisconsin roof snow loads map to easily determine the roof design snow load wisconsin administrative code. Sps 321 subchapter 2 for any location in the state of wisconsin. 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. H load due to lateral pressure of soil and water in soil.

In our case let s assume that our structure has a flat roof roof slope 5. 2002 wisconsin enrolled commercial building code. 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. 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. Sps 321 02 1 c c wind loads. Dwellings shall be designed and constructed to withstand either a horizontal and uplift pressure of 20 pounds. 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.

You can click on the map below to find the minimum roof design snow load for that location. 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. The loads shall be assumed to act vertically over the roof area pro jected upon a horizontal plane.

Or the 25 psf snow load could be entered as a roof snow load with the unbalanced snow loading option turned off. These questions aren t quite so easy to answer because there are several variables. The loads shall be assumed to act vertically over the roof area projected upon a horizontal plane. If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow.

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. How much snow a roof can hold depends on the type of snow roofline and material among other considerations.