Sps 321 27 note note.
Minimum roof pitch wisconsin.
Wisconsin has not adopted the international residential code irc and utilizes its own uniform dwelling code udc for all residential structures.
However you can only use this pitch with built up roofing or specialized.
Where the rafter spacing is greater than 24 inches on center roof boards shall be tongue and groove at least 1 5 inches thick.
Minimum roof pitch the minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.
A roof pitch of 7 in 12 is equal to 30.
A pvc roof is a lot more durable and longer lasting that a conventional epdm rubber roofing system.
But since there is still a wide variety of slate roofing systems there are occasions when the minimum pitch can go down to as low as 15 0 depending on the uniqueness of the roof.
Sps 321 subchapter 2 for any location in the state of wisconsin.
The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.
Note that roof pitch is sometimes used in parallel with roof slope.
I e 4 inches of rise per 12 inches one foot of run.
The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.
Anything above that will require you to put out higher cost because they are already considered as higher pitch.
The standard of lower pitch actually ranges between 1 12 to 5 12.
This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.
The values given here.
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.
If a roof slope rises say 4 inches when measured 12 inches along the bottom of a horizontal roof truss the roof slope is said to be 4 12.
With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 20 0 for slate roofs.
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.
The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot.
However roof pitch is technically measured and defined differently and will not be discussed here.
Sps 321 27 2 2 lateral restraint of walls.
Use our wisconsin roof snow loads map to easily determine the roof design snow load wisconsin administrative code.
Where the rafter spacing is 24 inches on center or less roof boards may be used that have a minimum thickness of 5 8 inch for solid sheathing and 3 4 inch for spaced sheathing.
