Minimum Roof Pitch Oregon

See the map usage notes or snow load analysis for oregon part ii for further information.

Minimum roof pitch oregon.

Minimum requirements other than density are calculated as. Measure to the average height of the highest gable. Minimum pitch for metal roof. Metal roof shingles require a minimum roof pitch of 3 12 or greater.

To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope. With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels. Gabled hipped or gambrel roof where roof pitch is 12 in 12 or less. For standing seam metal roof panel systems a 1 4 12 minimum roof slope is prescribed.

Asphalt shingles continue to be the most widely installed roof covering option in north america. This 1 4 12 minimum roof slope requirement also applies to spray polyurethane foam spf roof systems in new construction. However you can only use this pitch with built up roofing or specialized synthetic roofing. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.

Asphalt shingles require a minimum roof pitch of 2 12 or greater. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. Oregon structural specialty code the uniform building code as amended by the state.

Minimum roof snow load. Express the slope of a metal roof by a ratio which indicates the pitch of the roof. The minimum design roof snow load for all structures in oregon is 20 pounds per square foot psf. Let us recap on the minimum roof pitch required for each type of roofing material.

You need to consider the slope requirements of each panel to determine this minimum slope. The minimum roof slope for metal roofs is dependent upon the roof profile. The profile is the shape taken by the sheets when you bend them to form panels. You could also opt for a pvc flat roofing membrane.

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. 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 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.