It remains for the student to make the applications to uneven pitches.
How to join an uneven roof.
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.
Remove siding from the house where the new roof will attach to expose rafters or other framing of the old roof.
Put on a pair of work gloves.
Identify the roof areas that you will join.
All of the principles necessary for framing such a roof have been developed.
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Unit run of the hip.
Not infrequently a roof must be framed in which several pitches are involved.
Draw a diagonal line between 9 feet the run of the main roof on the tongue of the square and 7 feet 6 inches the secondary roof run on the blade.
It is advisable to prepare a framing plan as shown in fig.
Remove the shingles and underlayment on the edges of both pitches approximately 6 inches from the edges using a shingle.
This gives the angle of the hip rafter.
Connect a flat roof to a sloped or pitched roof with a ledger board.