Make a cutting on one of the sides of the horizontal roof beam on an angle.
Tying a porch roof into existing roof.
Tying in to an existing gable roof.
Attach the horizontal beam by using a nail gun.
Then mount new trusses on the new addition walls.
Tying a patio roof into existing house.
Now take the 4x4 beams and erect them to the perimeter outside the porch about four feet apart.
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.
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I would frame a wall up flush with the brick and then use siding to cover it from there on up.
After that to make it flush with the roof of the existing house cut the two outer rafters.
You have to do it thoroughly so that the rafters sit flush on it.
In any case the structure.
That fascia should be cut off where it is inside of the porch addition.