Minimum Shed Roof Angle

I always recommend at least a minimum pitch of 1 in 40.

Minimum shed roof angle.

However you can only use this pitch with built up roofing or specialized synthetic roofing. A shingle roof like this north dallas garage in the photo above may have a failure no matter how good a job the installer did. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal. Well there are a few more steps to add the roof covering and trim but you can read about them below potential roof framing for a flat roofed shed.

The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. The requirements for an asphalt shingles roof are contained in the international building code. Fix your roof deck and you are done. Use a pitch of more than ten degrees for more efficient rain protection.

Any roof from 4 12 to 9 12 is considered an ordinary angle for a roof. That works out to about nine degrees if that works better for you. The roof comprises a simple beam. Again the most important consideration is the weather.

A pitch of 10 degrees or less is typically regarded as a flat roof. 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. 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. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.

These are also the most common pitches for shed roofs.