Make a cutting on one of the sides of the horizontal roof beam on an angle.
Tying a porch roof into existing roof.
You have to do it thoroughly so that the rafters sit flush on it.
Tying a patio roof into existing house.
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First the 4x4 beams need to be cut to the size of the existing roof so the porch roof and the edge of the existing roof will be even when the job is complete.
After that to make it flush with the roof of the existing house cut the two outer rafters.
Butt the first new truss against the old one.
Tying in to an existing gable roof.
Attach the horizontal beam by using a nail gun.
In any case the structure.
Now take the 4x4 beams and erect them to the perimeter outside the porch about four feet apart.
Then mount new trusses on the new addition walls.
Tie into the end of an existing gable roof by removing existing facing boards wall siding and any other obstructions back to the first truss of the old roof.