You can also calculate roof pitch even without using a roof slope calculator.
Roof pitch for lean to.
A low pitched roof is anything that is any roof with a pitch of 3 12 or less.
Regular asphalt shingles that are rated for 4 in 12 roof slopes can be installed on lower slope roofs by simply installing a waterproof membrane under them.
Many roofing shingles do not allow applications onto roofs at this pitch.
Conventional roofs are the easiest to construct and you can walk on them safely.
More commonly roll on membranes such that use heat to bond seams together is used as a roofing material.
However you can only use this pitch with built up roofing or specialized synthetic roofing.
They have a pitch ranging from 4 12 to 9 12.
Solutions for lean to sheds both the asphalt shingles and metal roofs can be installed on a low slope lean to shed roof if the proper product is used and it is installed properly.
In other words if there is a 1 1 2 ridge board nailed into the wall and the width of the lean to is 96 then the run will be 94 1 2 96 1 1 2 94 1 2.