When a shed roof ties into an existing roof the new roof could be a simple lean to that covers a deck or porch or it could be the shed roof of a substantial addition.
Tying a porch roof into existing roof.
Then mount new trusses on the new addition walls.
Tying in to an existing gable roof.
After that to make it flush with the roof of the existing house cut the two outer rafters.
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Attach the horizontal beam by using a nail gun.
Make a cutting on one of the sides of the horizontal roof beam on an angle.
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.
Tying a patio roof into existing house.
That fascia should be cut off where it is inside of the porch addition.
I would frame a wall up flush with the brick and then use siding to cover it from there on up.
Butt the first new truss against the old one.
Now take the 4x4 beams and erect them to the perimeter outside the porch about four feet apart.