Connect a flat roof to a sloped or pitched roof with a ledger board.
How to join an uneven roof.
Put on a pair of work gloves.
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It remains for the student to make the applications to uneven pitches.
Identify the roof areas that you will join.
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.
All of the principles necessary for framing such a roof have been developed.
Framing a roof of uneven pitch.
It is advisable to prepare a framing plan as shown in fig.
Remove siding from the house where the new roof will attach to expose rafters or other framing of the old roof.
We measured from the ridge to the sleepers to get the lengths of the jacks and then cut them and fastened them into place.
To let the jacks sit plumb on top of the sleepers we angled the level cuts to the 3 1 2 in 12 pitch of the shed roof setting the circular saw to a 16 degree bevel the degree equivalent of a 3 1 2 in 12 pitch.
This gives the angle of the hip rafter.
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.