Minimum Roof Pitch Oregon

Minimum pitch for metal roof.

Minimum roof pitch oregon.

For standing seam metal roof panel systems a 1 4 12 minimum roof slope is prescribed. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Express the slope of a metal roof by a ratio which indicates the pitch of the roof. 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. For metal panel roof systems with nonsoldered seams with applied lap sealant ibc 2018 prescribes a 1 2 12 minimum roof slope. Let us recap on the minimum roof pitch required for each type of roofing material. The profile is the shape taken by the sheets when you bend them to form panels.

Minimum roof snow load. Minimum requirements other than density are calculated as. The minimum design roof snow load for all structures in oregon is 20 pounds per square foot psf. 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.

This 1 4 12 minimum roof slope requirement also applies to spray polyurethane foam spf roof systems in new construction. 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. You need to consider the slope requirements of each panel to determine this minimum slope. The minimum slope of a roof depends on the roof s profile.

The minimum roof slope for metal roofs is dependent upon the roof profile. Asphalt shingles require a minimum roof pitch of 2 12 or greater. Measure to the average height of the highest gable. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.

Clay and concrete tile requires a minimum roof pitch of 2 1 2 12 or greater. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope. 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. See the map usage notes or snow load analysis for oregon part ii for further information.

Metal roof shingles require a minimum roof pitch of 3 12 or greater. You could also opt for a pvc flat roofing membrane. Asphalt shingles continue to be the most widely installed roof covering option in north america. 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.