There are many roof.
Tie in roof lines.
Up from the valley center and cut through the shingles and underlayment.
As it turned out the existing roof structure is a truss system but they were able to contact the original truss manufacturer to verify that cutting the tails off would not jeopardize the structural integrity of.
To tie into the side of an existing roof put a new roof truss on the walls of the addition brace it upright then snap chalklines on the shingles to mark the center line of the new roof valleys where old and new roofs will connect.
After the addition roof is framed and sheathed snap a line on the existing roof shingles 2 in.
The back channel is connected to the rafter directly and reinforced.
After that cut the rafters back to the wall line.
How to tie building roof systems into one another.
You can raise the patio roof up to 500 millimeters by removing the eaves fascia and gutter.
Then it was just a matter of marking and cutting the miter for one side and flipping the cut off scrap over and cutting it to length for the other side.
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Because the level cut on the jacks would be so long we added 2x4 sleepers inside the 2x8s for a more complete bearing.
By doing this method you will have a clean finish that is connected to the wall line.
To tie the design together peter chose to cut the rafter tails off the extend the exterior wall up to the underside of the new roof.