Hip Roof Valley Framing

For regular hips and valleys where the roof sections have the same slope and meet to form a 90 degree angle.

Hip roof valley framing. 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. It is sometimes also referred to as a dutch gable roof precisely because it contains both roof style features. Here roofs are constructed with an angle of 90 degrees.

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. After installing the rafters we still had to extend the porch roof back over the shed roof creating a valley on either side. Now draw the centerlines for all rectangles that are formed inside. A dutch hip roof is a combination of both the hip roof and gable roof features.

Hip and valley roof framing is no so complex as compared to hip roof framing procedures. 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. First of all you need to design the layout of building. Minus ridge thickness to allow for ridge becoming pole plate roof peak will be slightly higher ridge thick must be same.

The roof framing plan. Now outline the biggest rectangle inside the building layout. Blind valleys simplify framing. The gable portion of a dutch hip roof is usually placed at the end of the roof ridge and sits on top of the plane of the hip roof.

Enter the extension wall length into wall length and double the extension wall width then minus ridge thickness into the wall width entries. Porch roof extensions for hip roof porch extensions from an existing building wall you can use half the calculator results. But here it will be different since the hip rafter doesn t lie at 45 degrees to the commons. For example in an equal hip roof with an 8 12 pitch the pitch of the hip rafter would be 8 17.

The general arrangement of rafters shown in the larger drawing. Unit run of the hip. 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.