Resilient asphalt shingles lie much flatter to the substrate than slate tile and concrete which keeps water from being easily blown under them.
2 12 pitch shed roof.
Many roof material manufacturers have minimum pitch ratings for their products.
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.
Remember that pitch is calculated as the height or rise of a roof pitch over 12 inches of horizontal run.
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Your shed roof pitch may also be influenced by your project specific requirements to let light into the building through the roof or create storage space in the roof void.
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.
Constructing a new shed roof at the desired pitch is as easy as knowing how to use a speed square.
Therefore if your roof rises 4 inches over the course of 12 inches of horizontal run then your roof pitch is 4 12.
Many shingle manufacturers recommend no less than 2 12 when installing.