Transition Joining Two Roofs With Different Pitches

This is a fairly common roof detail.

Transition joining two roofs with different pitches.

Cut two rafters with a circular saw to the pitch of the addition roof and nail them across the rafters on the old roof. Pitch transitions are a common roof detail. The overhang is 16 inches measured horizontally and the fascia runs at a continuous height around the entire house. See the illustration below.

This allows water to flow off the upper panels out over the trim onto the lower panels and exits the roof at the eaves. This technique is beneficial particularly in home expansion. 489 78 kb my business partner and i recently added a large screened in porch with a gable roof onto a client s home. By john carroll download the pdf version of this article.

Joining two roofs with different pitches is a method that exists in the building and construction world. The other is to get the fascias to line up. Joining these two roofs poses two main challenges. To transition the eaves the.

We see this quite frequently in log home roofs with porches for example. Joining two roofs of different pitches framing. The roof plane goes from one pitch to a lower pitch. Transition flashing installation guide 1.

Slide the right edge of the flashing under the highest roof pitch. Position the flashing between the two roof pitches. After bottom roofing panels have been installed set one piece of transition flashing down where the top portion non hemmed of the transition flashing lies flat on the upper roof 3. One is getting the two differently pitched planes to meet at the hip or valley rafter.

They form an upside down v with the point at the top of the addition roof. Place the 2 by 4 inch piece of lumber along the center of the flashing. We re going to install it over top of the panels that have already been installed on the lower slope. A roof pitch transition is a line in the roof plane that changes pitch.

The piece that allows us to join the two different slopes is the pitch transition trim. Measure 1 1 2 from bottom edge of transition flashing. Learn more about off angle roof framing. Jlc classics joining two roofs of different pitches.

A sketchup model helps clarify how various rafters and framing components are assembled in an off angle hip and valley configuration.