The very first step is to set up the trusses or rafters of the addition s walls so that.
How roof is tied with existing roof.
Connect a flat roof to a sloped or pitched roof with a ledger board.
Attach the horizontal beam by using a nail gun.
Butt the first new truss against the old one.
Now you can begin assembling the outer rafters and attaching the rafter beam to the edge of the roof of the house.
The edge of the roof of the house and the frame to the porch should be seamless now.
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Install the valley board.
After that to make it flush with the roof of the existing house cut the two outer rafters.
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.
How to tie into existing roof shingles step 1.
In any case the structure.
Remove siding from the house where the new roof will attach to expose rafters or other framing of the old roof.
Then mount new trusses on the new addition walls.
Now you are ready for the installation of the roof and the shingles that you can pick out your local home improvement store.
Up from the valley center and cut through the shingles and underlayment.
The easiest way to tie in the new shingles with the old is with a cut valley see four ways to shingle a valley.
The roof i.
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.
Install the 2x4 joists with some screws and brackets to the house edge.
Tying in to an existing gable roof.
Now you have tied in the porch roof addition to the house.
After the addition roof is framed and sheathed snap a line on the existing roof shingles 2 in.