As stated in the.
2 12 pitch shed roof.
Many roof material manufacturers have minimum pitch ratings for their products.
Resilient asphalt shingles lie much flatter to the substrate than slate tile and concrete which keeps water from being easily blown under them.
Much depends on what your intended use for the shed actually is.
Remember that pitch is calculated as the height or rise of a roof pitch over 12 inches of horizontal run.
The reason for this is that flat or shallow roofs withstand much more abuse and loads than steeper roofs making wider shed roof rafters a necessity.
Constructing a new shed roof at the desired pitch is as easy as knowing how to use a speed square.
A pitch of 2 12 is the minimum pitch for shingles made of asphalt so your roof just barely makes the cut off for one of the most popular roofing material options.
Whichever roof pitch you choose make sure that you select a roof covering that is designed to be waterproof at the angle that you eventually select.
Therefore if your roof rises 4 inches over the course of 12 inches of horizontal run then your roof pitch is 4 12.