9 Best Of What Is The Lowest Pitch For A Roof Best Resolution Image. The smallest pitch of a roof is 1412 which translates to 14 inch rise to 12 inches of run. To calculate roof pitch take the lowest point of the roof and measure the amount of rise for every 12 inches of horizontal movement toward the highest point.
It is uncommon to find a roof below 15. It is the recommended slope as there is no guarantee if you opt for flatter pitch than this. As well a slope of 412 is most commonly considered the lowest slope for standard shingle installations.
You need to consider the slope requirements of each panel to determine this minimum slope.
The minimum pitch for a lapped non-sealed metal roof is 312. To calculate roof pitch take the lowest point of the roof and measure the amount of rise for every 12 inches of horizontal movement toward the highest point. Was recommended in BS 5534 but modern tiles and slates have now been designed for applications as low as 15. As well a slope of 412 is most commonly considered the lowest slope for standard shingle installations.