Snow loads roofs shall be designed and constructed to support the minimum snow loads listed on the zone map.
Roof support snow load wisconsin.
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.
The loads shall be assumed to act vertically over the roof area projected upon a horizontal plane.
H load due to lateral pressure of soil and water in soil.
How much snow a roof can hold depends on the type of snow roofline and material among other considerations.
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.
Or the 25 psf snow load could be entered as a roof snow load with the unbalanced snow loading option turned off.
Sps 321 02 1 c c wind loads.
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.
L live load except roof live load including any per1nit ted live load reduction.
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.
You can click on the map below to find the minimum roof design snow load for that location.
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.
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.
The snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load.
2002 wisconsin enrolled commercial building code.
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.
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.
Other considerations for sloped roofs can be found throughout chapter 7 of asce 7 10.
These questions aren t quite so easy to answer because there are several variables.
L roof live load including any permitted live load reduc tion.
If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow.
Use our wisconsin roof snow loads map to easily determine the roof design snow load wisconsin administrative code.
