Wisconsin Minimum Roof Pitch

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Wisconsin minimum roof pitch.

3 uplift and suction forces. 2 lateral restraint of walls. With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 200 for slate roofs. Asphalt shingles continue to be the most widely installed roof covering option in north america.

What is the minimum slope for an asphalt shingle roof. Roof system installation details shall be drawn at a minimum scale of 1 1 2 1 0. 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. 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.

When determining roof pitch on a building it is easiest to do so from a gable end where using a level you can take clear measurements. Use our wisconsin roof snow loads map to easily determine the roof design snow load wisconsin administrative code. You could also opt for a pvc flat roofing membrane. 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.

Call the project manager as to a preference of half size or full size paper sets and or electronic copy review sets. However you can only use this pitch with built up roofing or specialized synthetic roofing. A 12 12 roof would rise 12 feet for every 12 feet it goes back horizontally creating a 45 degree angle. On a hip roof you must take the measurements from the rooftop.

Wisconsin has not adopted the international residential code irc and utilizes its own uniform dwelling code udc for all residential structures. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Determining your roof s pitch.

Sps 321 subchapter 2 for any location in the state of wisconsin. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. 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. Roof plan shall be drawn at a minimum scale of 1 16 1 0.

Where the rafter spacing is greater than 24 inches on center roof boards shall be tongue and groove at least 1 5 inches thick.