Roof Loading 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.

Roof loading wisconsin.

The value of cs shall be determined by the following. The balanced snow load is applied everywhere where the roof structure is located. Roof load live load design is affected by the shape of the roof whether it is flat curved or pitched. Sps 321 02 1 b 2.

L roof live load including any permitted live load reduc tion. May be reduced for roof slopes greater than 30 by multiplying the snow load by cs. After you obtain the roof slope factor from those sections in asce 7 10 the balanced design snow load for the sloped roof can easily be calculated using equation 7 4 1. If the ground snow load isn t specified then a ground snow load needs to be assumed and the truss designer and the building designer may not be on the same page as it relates to this design assumption.

See pdf for diagram. L live load except roof live load including any per1nit ted live load reduction. The determination of the drift load that is required for unbalanced snow load cases requires the use of the ground snow load pg not the roof snow load. Also extremely relevant to roofs with sections on rain loads snow loads and wind loads.

The north zone middle zone and the south zone are identified on the roof load zone. In addition to estimating the roof loading it s important to know the loading the roof can resist. Chapter 16 structural design. Roofs are under a lot of pressure.

Load limits on the roof of a building. 2018 international building code. Chapter 15 roof assemblies and rooftop structures. 2018 international building code.

The loads shall be assumed to act vertically over the roof area pro jected upon a horizontal plane. Dwellings shall be designed and constructed to withstand either a horizontal and uplift pressure of 20 pounds per square foot acting over the surface area or the wind loads. Wisconsin has not adopted the international residential code irc and utilizes its own uniform dwelling code udc for all residential structures. On the upcodes website.

However a south roof load zone home cannot be installed in either a middle or north roof load zone. Support the minimum snow loads listed on the zone map. Sps 321 27 1 c c sloped roof snow loads. Roof loads are a downward vertical force on the home.

If your structure has a sloped or flat roof you still need to calculate the flat roof snow load. On the upcodes website. In order to stay intact and in place a roof must be able to resist loads both permanent and temporary that are pushing. Sps 321 subchapter 2 for any location in the state of wisconsin.

Use our wisconsin roof snow loads map to easily determine the roof design snow load wisconsin administrative code.