Minimum Roof Pitch Wisconsin

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.

Minimum roof pitch wisconsin.

Provisions shall be taken to absorb the horizontal thrust produced by a sloping roof through the use of wall ties ceiling joists beams at the ridge or at the wall or a system designed through structural analysis. 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. 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. 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.

With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 20 0 for slate roofs. The values given here. Sps 321 27 note note. Minimum roof pitch for shingles.

The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. Sps 321 subchapter 2 for any location in the state of wisconsin. 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. Wisconsin has not adopted the international residential code irc and utilizes its own uniform dwelling code udc for all residential structures.

You could also opt for a pvc flat roofing membrane. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Sps 321 27 2 2 lateral restraint of walls. I e 4 inches of rise per 12 inches one foot of run.

The standard of lower pitch actually ranges between 1 12 to 5 12. However roof pitch is technically measured and defined differently and will not be discussed here. A pvc roof is a lot more durable and longer lasting that a conventional epdm rubber roofing system. 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.

The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot. Use our wisconsin roof snow loads map to easily determine the roof design snow load wisconsin administrative code. Anything above that will require you to put out higher cost because they are already considered as higher pitch.

Note that roof pitch is sometimes used in parallel with roof slope.