Minimum Shed Roof Angle

Any roof from 4 12 to 9 12 is considered an ordinary angle for a roof.

Minimum shed roof angle.

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. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. These are also the most common pitches for shed roofs. However you can only use this pitch with built up roofing or specialized synthetic roofing.

Again the most important consideration is the weather. Use a pitch of more than ten degrees for more efficient rain protection. That works out to about nine degrees if that works better for you. A pitch of 10 degrees or less is typically regarded as a flat roof.

According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal. I always recommend at least a minimum pitch of 1 in 40. The minimum requirement is 2 12. Fix your roof deck and you are done.

A flat roof is more likely to allow rain to pool and this can cause damage especially if the roof is made of a porous substance like wood. This translates into a fall of just under 2 5 on an 8 foot roof. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. The roof comprises a simple beam.

Much depends on what your intended use for the shed actually is.