Northern Wisconsin Roof Snow Loads For Trusses

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.

Northern wisconsin roof snow loads for trusses.

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. Snow loads roofs shall be designed and constructed to support the minimum snow loads listed on the zone map. To design trusses for. Box 441022 moscow id 83844 1022.

Purpose of this web site. In addition to estimating the roof loading it s important to know the loading the roof can resist. A publication can be purchased called ground and roof snow loads for idaho by r. These questions aren t quite so easy to answer because there are several variables.

Or the 25 psf snow load could be entered as a roof snow load with the unbalanced snow loading option turned off. The purpose of this web site is to provide ground snow load analysis information and data gathered from all 50 states. Joists trusses and beams other than wood spaced 4 feet or less on center and 40 feet or less in length slabs or other members causing continuous loads shall be transmitted to masonry with a minimum bearing of 3 inches upon solid masonry at least 2 inches in height or as indicated for concentrated loads. The top chord live load for trusses used for residential structures udc in the state of wisconsin should be determined based on this map.

Agricultural structures are exempt from this requirement. 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. Sps 321 26 9 b b continuous loads. Dwellings shall be designed and constructed to withstand either a horizontal and uplift pressure of 20 pounds.

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. The loads shall be assumed to act vertically over the roof area pro jected upon a horizontal plane. Wisconsin has not adopted the international residential code irc and utilizes its own uniform dwelling code udc for all residential structures.

Sheikh taheri published by the ui department of civil engineering 1986. A zone map of minimum roof snow design load is provided in the code and it is shown below see figure 2.