Wisconsin Minimum Roof Pitch

The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

Wisconsin minimum roof pitch.

May be reduced for roof slopes greater than 30 by multiplying the snow load by cs. Sps 321 02 1 b 2. Express the slope of a metal roof by a ratio which indicates the pitch of the roof. Minimum pitch for metal roof.

Sps 321 subchapter 2 for any location in the state of wisconsin. The minimum slope of a roof depends on the roof s profile. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. Sps 321 27 1 c c sloped roof snow loads.

You could also opt for a pvc flat roofing membrane. Sps 321 28 5 5 other roof coverings. 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. See pdf for diagram.

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. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.

With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels. The values given here. Asphalt shingles continue to be the most widely installed roof covering option in north america. The minimum roof slope for metal roofs is dependent upon the roof profile.

Wisconsin has not adopted the international residential code irc and utilizes its own uniform dwelling code udc for all residential structures. The value of cs shall be determined by the following. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. The profile is the shape taken by the sheets when you bend them to form panels.

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. There are some standing seam metal roofing options available from atas and other manufacturers that can be installed on a roof with pitch of 1 12. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope.