Unequal Pitch Hip Roof Framing

Mark 3 perpendicular lines on the top edge of the hip rafter using these dimensions.

Unequal pitch hip roof framing.

To maintain a consistant ridge height in these situations the roof pitch must be adjusted. The most common parameter is to maintain an equal ridge height over building sections with differing spans. 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. The hip roof has four sloping sides.

Not infrequently a roof must be framed in which several pitches are involved. 90 00 37 32054 52 67946. 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. Select the following information by using the drop downs to enter values in feet and inches.

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. Framing a roof of uneven pitch. Overview although uncommon there are situations where architectural parameters require off angle hip and valley roof construction. These hip rafters run at a 45 angle from each corner of the building to the ridge.

Find the hip s unit run as in figure 3b. Blind valleys simplify framing. It is the strongest type of roof because it is braced by four hip rafters. 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.

Framing a roof of uneven pitch. The pitch of the unequal hip rafter can be expressed in relation to either the main roof or the secondary roof. 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. It is advisable to prepare a framing plan as shown in fig.

All of the principles necessary for framing such a roof have been developed. 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. A disadvantage of the hip roof is that it is more difficult to construct than a gable roof.