Minimum Roof Pitch For Dormers

The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.

Minimum roof pitch for dormers.

Thus a 4 12 pitch would be a 33 slope. 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. The loft space would be much larger with a roof pitch of 45 degrees. A 4 12 pitch is around 18 5 degrees but not exactly.

Having a steeper pitched roof allows for more space in a shed loft. However you can only use this pitch with built up roofing or specialized synthetic roofing. Pitched roofs can also be used to incorporate roof lights angled in a specific direction or dormer windows. However rise over run is more efficient and easier to understand for the average diyer.

A shed dormer on the other hand is usually had on homes with a roof pitch of at least 8 in 12 or steeper.