Sps 321 subchapter 2 for any location in the state of wisconsin.
Wisconsin minimum roof pitch.
Minimum pitch for metal roof.
May be reduced for roof slopes greater than 30 by multiplying the snow load by cs.
With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels.
Sps 321 27 1 c c sloped roof snow loads.
Express the slope of a metal roof by a ratio which indicates the pitch of the roof.
You need to consider the slope requirements of each panel to determine this minimum slope.
To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope.
The values given here.
The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.
However you can only use this pitch with built up roofing or specialized synthetic roofing.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
Wisconsin has not adopted the international residential code irc and utilizes its own uniform dwelling code udc for all residential structures.
The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7.
See pdf for diagram.
Use our wisconsin roof snow loads map to easily determine the roof design snow load wisconsin administrative code.
This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.
The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.
The minimum roof slope for metal roofs is dependent upon the roof profile.
You could also opt for a pvc flat roofing membrane.
Sps 321 28 5 5 other roof coverings.
The minimum slope of a roof depends on the roof s profile.
The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
So you would need to pick the right option as most regular standing seam metal roofs will require a roof pitch of 2 12 or even 3 12 at a minimum.
Snow loads specified in s.
Sps 321 28 4 b b the ice dam protection shall extend at least 30 inches up the roof slope from the roof edge and at least 12 inches up the roof slope beyond the inner face of the exterior wall.
Sps 321 02 1 b 2.
The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.
The profile is the shape taken by the sheets when you bend them to form panels.
