Next click on the hip angles button and then click on the hip valley rafter slope angle text.
Unequal pitch hip roof.
Select the following information by using the drop downs to enter values in feet and inches.
The pitch of the unequal hip rafter can be expressed in relation to either the main roof or the secondary roof.
If it is required to continue the tile courses in line around the hip line and the roof pitches at each face are unequal it will be necessary to set out the tile batten gauge on the lesser pitch first.
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.
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.
To get results you need to provide roof base dimensions length and width and roof pitch we assume it is identical for all sides.
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Hips with unequal roof pitches.
The following example will make clear the method of attack where it is desired to develop a constant for hip or valley in terms of the common rafter of one of the pitches.
To maintain a consistant ridge height in these situations the roof pitch must be adjusted.
Minor roof rise 5 run 6 5 12 pitch.
Main roof rise 8 run 12 pitch.
We ll use the 12 as the rotation point on the framing square and move the other end of the framing square to the edge of the hip rafter material using the 6 rotation dimension.
It will display the framing square usage for the slope angle of the hip rafter 27 50055 6 12.
But here it will be different since the hip rafter doesn t lie at 45 degrees to the commons.
Then the battens on the steeper pitch can be fixed in line with the first battens.
Determining the slope and skew angles related to hip and valley beams can be a challenge made even more difficult when the roof slopes on each side if the hip or valley are different.
The most common parameter is to maintain an equal ridge height over building sections with differing spans.
For example in an equal hip roof with an 8 12 pitch the pitch of the hip rafter would be 8 17.
