Minimum Roof Pitch For Dormers
A 4 12 pitch is around 18 5 degrees but not exactly.
Minimum roof pitch for dormers. However you can only use this pitch with built up roofing or specialized synthetic roofing. Thus a 4 12 pitch would be a 33 slope. Pitched roofs can also be used to incorporate roof lights angled in a specific direction or dormer windows. The loft space would be much larger with a roof pitch of 45 degrees.
The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. You can also divide the rise over run multiply by 100 and get a percentage. Having a steeper pitched roof allows for more space in a shed loft. This image shows a relatively shallow roof pitch of 15 degrees.
Roofing gutters and all waterproofing anywhere minimum roof pitch i am planning a shed dormer with a roof that will have about 3 12 pitch.