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.
Northern wisconsin roof snow loads for trusses.
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.
Snow loads roofs shall be designed and constructed to support the minimum snow loads listed on the zone map.
Or the 25 psf snow load could be entered as a roof snow load with the unbalanced snow loading option turned off.
In addition to estimating the roof loading it s important to know the loading the roof can resist.
Use our wisconsin roof snow loads map to easily determine the roof design snow load wisconsin administrative code.
If you live in the us our snow load calculator compares the total weight on your roof with the permissible load calculated according to the standards issued by the american society of civil engineers regarding the minimum design loads for buildings and other structures asce7 16.
Purpose of this web site.
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.
Wisconsin has not adopted the international residential code irc and utilizes its own uniform dwelling code udc for all residential structures.
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.
The purpose of this web site is to provide ground snow load analysis information and data gathered from all 50 states.
A publication can be purchased called ground and roof snow loads for idaho by r.
Sheikh taheri published by the ui department of civil engineering 1986.
The top chord live load for trusses used for residential structures udc in the state of wisconsin should be determined based on this map.
Sps 321 subchapter 2 for any location in the state of wisconsin.
Box 441022 moscow id 83844 1022.
A zone map of minimum roof snow design load is provided in the code and it is shown below see figure 2.
The loads shall be assumed to act vertically over the roof area pro jected upon a horizontal plane.
To request a copy send a check for 22 50 includes postage payable to department of civil engineering university of idaho p o.
These questions aren t quite so easy to answer because there are several variables.
