Unequal Pitch Hip Roof

How to precisely layout an split pitch hip roof rafter using rafter tools for iphone.

Unequal pitch hip roof.

Major side roof pitch major. Major side roof span building width ridge thickness 2. 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. 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.

Major side plan angle. But here it will be different since the hip rafter doesn t lie at 45 degrees to the commons. One of users asked us to create calculator which will help him estimate hip roof parameters like rafter s lengths roof rise and roof area. Slope of hip end roof.

Then scroll down the page the calculated results should look like the following. 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. To get results you need to provide roof base dimensions length and width and roof pitch we assume it is identical for all sides. It will calculate the roof rafter lengths for an unequal overhang roof.

Overview although uncommon there are situations where architectural parameters require off angle hip and valley roof construction. For example in an equal hip roof with an 8 12 pitch the pitch of the hip rafter would be 8 17. The amount to be removed from each side must be separately determined according to the angle the hip makes with the plate. The most common parameter is to maintain an equal ridge height over building sections with differing spans.

The backing of hips on roofs of uneven pitches while the amount to be removed on each side of the hip will vary is determined by the principles developed in sec. Minor side roof pitch minor. To maintain a consistant ridge height in these situations the roof pitch must be adjusted. Unit run of the hip.

90 00 37 32054 52 67946. Main rafter length to ridge. All formulae are below the calculator.