Hip Roof Valley Framing

It is sometimes also referred to as a dutch gable roof precisely because it contains both roof style features.

Hip roof valley framing.

Blind valleys simplify framing. But here it will be different since the hip rafter doesn t lie at 45 degrees to the commons. Minus ridge thickness to allow for ridge becoming pole plate roof peak will be slightly higher ridge thick must be same. The general arrangement of rafters shown in the larger drawing.

Now outline the biggest rectangle inside the building layout. The roof framing plan. To keep the porch roof framing as simple as possible we installed a structural ridge supported by posts at each end with the common rafters landing on top of the ridge. Unit run of the hip.

I ll start at the beginning with the easy bits before tackling the more complicated stuff and that way hopefully i ll make it really clear and easy to understand exactly how to set out measure cut and install hip and valley roof rafters. A dutch hip roof is a combination of both the hip roof and gable roof features. The hip and valley factor is a number that is multiplied by the actual run horizontal distance of a common rafter to determine the length of a hip or valley rafter. Repeat the run not the length of a common rafter for precision the thickness of the ridge board and any eave.

Hipped roof construction can seem quite complicated to grasp at first but i m going to break it down and explain each area in detail. For example in an equal hip roof with an 8 12 pitch the pitch of the hip rafter would be 8 17. For regular hips and valleys where the roof sections have the same slope and meet to form a 90 degree angle. Hip and valley roof framing is no so complex as compared to hip roof framing procedures.

First of all you need to design the layout of building. Here roofs are constructed with an angle of 90 degrees. After installing the rafters we still had to extend the porch roof back over the shed roof creating a valley on either side. 504 chapter 18 hip valley jack rafters.

Now draw the centerlines for all rectangles that are formed inside. A mastery of roof framing with hip valley and jack rafters is what distinguishes the true hip rafters 18 1 figure 18 1 hip jack and valley rafters roof anatomy a. In a hip roof with equal pitches the unit run of a hip or valley rafter is 17 inches for every 12 inches of run in the main roof.