Unequal Pitch Hip Roof Framing

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.

Unequal pitch hip roof framing.

Find the hip s unit run as in figure 3b. The most common parameter is to maintain an equal ridge height over building sections with differing spans. 90 00 37 32054 52 67946. Overview although uncommon there are situations where architectural parameters require off angle hip and valley roof construction.

Select the following information by using the drop downs to enter values in feet and inches. To maintain a consistant ridge height in these situations the roof pitch must be adjusted. A disadvantage of the hip roof is that it is more difficult to construct than a gable roof. The pitch of the unequal hip rafter can be expressed in relation to either the main roof or the secondary roof.

It will display the framing square usage for the slope angle of the hip rafter 27 50055 6 12. Since you need only one set of numbers to lay out the cuts let s work with the main roof which has a unit rise of 8 inches. Mark 3 perpendicular lines on the top edge of the hip rafter using these dimensions. Next click on the hip angles button and then click on the hip valley rafter slope angle text.

Blind valleys simplify framing. These hip rafters run at a 45 angle from each corner of the building to the ridge. It remains for the student to make the applications to uneven pitches. It is advisable to prepare a framing plan as shown in fig.

Framing a roof of uneven pitch. Using a pitch measuring tool that i d made we also determined that the exact pitch of the shed roof was 3 1 2 in 12. All of the principles necessary for framing such a roof have been developed. Set your saw blade bevel angle to the 56 30993 to cut the hip rafter tail plumb cut on the 12 12 roof pitch side of the hip rafter.

The hip roof has four sloping sides. The hip roof framing calculator returns the value of the main rafter the side rafter the length of the hip the height of the knee wall and the lengths of the jack rafters. Which is the hip rafter side cut angle at the foot of the hip rafter on the 8 12 roof pitch side of the roof.