Tying a patio roof into existing house.
Tying a porch roof into existing roof.
Make a cutting on one of the sides of the horizontal roof beam on an angle.
In any case the structure.
You have to do it thoroughly so that the rafters sit flush on it.
Then mount new trusses on the new addition walls.
Attach the horizontal beam by using a nail gun.
Butt the first new truss against the old one.
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.
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.
Now take the 4x4 beams and erect them to the perimeter outside the porch about four feet apart.
Tying in to an existing gable roof.
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After that to make it flush with the roof of the existing house cut the two outer rafters.