Shingle the addition roof letting the new shingles fold through the valley center and onto the old roof deck by at least 1 ft.
New addition roof ridge framing to existing roof.
Re lay the shingles you removed from the existing roof.
In any case the structure.
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.
Butt the first new truss against the old one.
That s a simple low cost solution that can tie in well with the main house.
Tying in to an existing gable roof.
Bed the end of each shingle in a 2 in wide ribbon of roofing cement placed 4 in.
How to tie a additions roof to existing roof roof designs to attach to existing home how to construct a roof from an exsisting shead how to attach a deck roof to existing roof how to add a roof over porch cost to tie into existing roof attache porch roof on house attach shed roof to house adding a roof to screened in porch adding a roof to existing.
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.
Then mount new trusses on the new addition walls.
Framing addition matching existing roof plane not sure i understand completely but from the 3d sketches it looks like you are lowering the pitch of the roof over the area where the addition is put to account for the greater width.
After installing the rafters we still had to extend the porch roof back over the shed roof creating a valley on either side.
They form an upside down v with the point at the top of the addition roof.
If you re adding to the gable end of the house the side wall that goes up to the roof s peak it s fairly easy to extend the existing roofline over the new space says curt schultz a realtor architect builder in pasadena calif.