When you are designing your shed roof whether it be a gambrel gable or saltbox you should never have any roof pitch less than a 3 12.
Shed roof degree.
Shed loft having a steeper pitched roof allows for more space in a shed loft.
You can also divide the rise over run multiply by 100 and get a percentage.
Find the tangent of the angle tan angle.
Anything less than this will ultimately result in a roof that leaks if you plan on putting shingles on it.
Roof pitch and corresponding angle of degree turn in a set of building blueprints with a pitch less than 3 12 or build a shed style roof with a low pitch and your building inspector will not pass the construction and provisions will have to be made to get the pitch up to acceptable standards if it is going to be shingled.
The loft space would be much larger with a roof pitch of 45 degrees.
This image shows a relatively shallow roof pitch of 15 degrees.
A 30 roof pitch is roughly the same as a 7 12 roof pitch.
To convert from degrees to the american ratio.
A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible.
This means that for every 12 horizontal run you must have at least 3 of rise.