Depends on the slope of the new roof.
How to tie in new roof to existing roof.
After the addition roof is framed and sheathed snap a line on the existing roof shingles 2 in.
Roofing nails to the existing structural sheathing.
The lower the slope the further it should extend.
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 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.
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.
Now you are ready for the installation of the roof and the shingles that you can pick out your local home improvement store.
Strip the roofing from the old roof at the connection point to.
The big idea is that layers of the lower roof should sit below corresponding layers of the upper roof.
The new flashing should go under the old felt and over the new felt and new roll roofing.
Now you have tied in the porch roof addition to the house.
Install the 2x4 joists with some screws and brackets to the house edge.
The roof i.
To tie into the side of an existing roof put a new roof truss on the walls of the addition brace it upright then snap chalklines on the shingles to mark the center line of the new roof valleys where old and new roofs will connect.
If your addition butts up to the end of the house either on the same roof plane or lower e g a one story addition on a two story house end start your framing by nailing a new truss either to the last truss in the old roof or to the wall of the house.
Tie a new gable or hip roof to an existing gable or hip roof with valley rafters which perform the same function as ledgers.