11 Best Of What Is The Minimum Pitch For A Flat Roof New Update 2021. This is the basis for calculating the angle which is approximately a 119-degree slope. As a ratio it would be 012512 or 0125 inches slope per 12 inches.
If the pitch of your roof is 6 inches per 2 inches the angle would be 265 degrees. Roof slope can have a significant effect on the cost of a building. The smallest pitch of a roof is 1412 which translates to 14 inch rise to 12 inches of run.
As a ratio it would be 012512 or 0125 inches slope per 12 inches.
These savings are in the wall structure and wall cladding. That works out to about nine degrees if that works better for you. For low slope metal roofs under 12 that are nearly flat Modified bitumen roofing thermostat and thermoplastic single-ply are approved and recommended. The short simple answer is 212 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.