Minimum Roof Pitch Oregon

The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.

Minimum roof pitch oregon.

Oregon structural specialty code the uniform building code as amended by the state. Metal roof shingles require a minimum roof pitch of 3 12 or greater. Minimum pitch for metal roof. Oregon requires a minimum roof snow load of 20 psf pm in asce7 for all roofs plus a 5 psf rain on snow surcharge for many roof types resulting in a 25 psf minimum roof design load for most roofs.

Asphalt shingles continue to be the most widely installed roof covering option in north america. However you can only use this pitch with built up roofing or specialized synthetic roofing. Minimum roof snow load. 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.

Measure to the average height of the highest gable. Let us recap on the minimum roof pitch required for each type of roofing material. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Minimum requirements other than density are calculated as.

For metal panel roof systems with nonsoldered seams with applied lap sealant ibc 2018 prescribes a 1 2 12 minimum roof slope. 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. Express the slope of a metal roof by a ratio which indicates the pitch of the roof. The minimum roof slope for metal roofs is dependent upon the roof profile.

The minimum slope of a roof depends on the roof s profile. Clay and concrete tile requires a minimum roof pitch of 2 1 2 12 or greater. The profile is the shape taken by the sheets when you bend them to form panels. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope.

Asphalt shingles require a minimum roof pitch of 2 12 or greater. See the map usage notes or snow load analysis for oregon part ii for further information. This 1 4 12 minimum roof slope requirement also applies to spray polyurethane foam spf roof systems in new construction. This may not be reduced for slope or any other conversion factor and may be only modified where applicable by a rain on snow surcharge oregon structural specialty code ossc section 1608 1.

For standing seam metal roof panel systems a 1 4 12 minimum roof slope is prescribed. Gabled hipped or gambrel roof where roof pitch is 12 in 12 or less. 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 minimum design roof snow load for all structures in oregon is 20 pounds per square foot psf.