Therefore if your roof rises 4 inches over the course of 12 inches of horizontal run then your roof pitch is 4 12.
Firewood shed roof pitch.
The picture below shows a second 12 foot 2x6 cross beam placed on the back of the shed attached using lag screws and 3 5 deck screws.
If you are only trying to keep a wood pile dry or storing a few outdoor tools and light machinery out of the weather then you might consider a simple single pitch roof since most everything inside will be stored at ground level and pulled out from the outside of the shed.
Having a steeper pitched roof allows for more space in a shed loft.
Constructing a new shed roof at the desired pitch is as easy as knowing how to use a speed square.
This 2x6 was set to a height allowing a 2 12 roof pitch.
This allows the roof to overhang the side of the shed adding more protection to your firewood.
Pitched roofs are attractive and also can be used for additional space for a shed loft.
The roof pitch measures the steepness of your shed roof and typically takes values from 1 to 12.
Remember that pitch is calculated as the height or rise of a roof pitch over 12 inches of horizontal run.
Read more about roof pitch at wikipedia.
Beyond that you re free to choose whatever slope best fits your plans for your shed.
If your roof pitch is greater than 3 your roof is considered pitched.
This image shows a relatively shallow roof pitch of 15 degrees.
The term pitch refers to the slope of the roof.
Much depends on what your intended use for the shed actually is.