Most architectural dimensional laminate shingles are good down to 2 12 with i ws underlayment per manufacturer s instructions.
Metal roof on 2 12 pitch.
Panels joined with an applied lap sealant can go as low as 12.
After that the miimum pitch for metal panels depending on the methods used to join the panels.
Simply put it s a shallow roof.
For low slope metal roofs under 12 that are nearly flat modified bitumen roofing thermoset and thermoplastic single ply are approved and recommended.
My only recommendation with metal is that you read and understand the installation instructions before buying any material.
Metal roof spec s vary wildly from brand to brand and brands vary wildly from region to region.
The minimum pitch for metal roof shingles and lapped non soldered panels is 3 12.
Minimum roof pitch for metal building.
It determines how many inches the roof should rise for every 12 inches expanding on the horizontal side.
Amongst many decisions one has to make when designing a metal building determining metal roof minimum slope is one of them.
That means there is at least 3 of vertical rise to the roof slope for every 12 it goes back horizontally.
Roof pitch is the degree of building s roof slope.
If a roof rises 2 in a length of 12 this is 2 12 roof pitch.
2 12 roof pitch angle 9 46 degrees.
Roof pitch basics a 2 12 roof slope means your roof has 2 inches of vertical drop for every 12 inches of horizontal distance.