To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope.
Minimum roof pitch oregon.
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.
Express the slope of a metal roof by a ratio which indicates the pitch of the roof.
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.
This 1 4 12 minimum roof slope requirement also applies to spray polyurethane foam spf roof systems in new construction.
Oregon structural specialty code the uniform building code as amended by the state.
Measure to the average height of the highest gable.
Minimum roof snow load.
The minimum roof slope for metal roofs is dependent upon the roof profile.
The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
Asphalt shingles require a minimum roof pitch of 2 12 or greater.
You need to consider the slope requirements of each panel to determine this minimum slope.
For metal panel roof systems with nonsoldered seams with applied lap sealant ibc 2018 prescribes a 1 2 12 minimum roof slope.
They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.
With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels.
Let us recap on the minimum roof pitch required for each type of roofing material.
Minimum requirements other than density are calculated as.
For standing seam metal roof panel systems a 1 4 12 minimum roof slope is prescribed.
Clay and concrete tile requires a minimum roof pitch of 2 1 2 12 or greater.
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.
The profile is the shape taken by the sheets when you bend them to form panels.
See the map usage notes or snow load analysis for oregon part ii for further information.
The minimum slope of a roof depends on the roof s profile.
The minimum design roof snow load for all structures in oregon is 20 pounds per square foot psf.
However you can only use this pitch with built up roofing or specialized synthetic roofing.
You could also opt for a pvc flat roofing membrane.
The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.
Metal roof shingles require a minimum roof pitch of 3 12 or greater.
