The positioning of your rafters will depend on the pitch of the porch roof.
How to attach a shed roof to an existing roof.
Choose a roof pitch 3 12 and roof structure 2x6 this places the new roof on top of the existing roof.
In any case the structure that the shed roof is leaning on is an existing roof typically a gable roof with a ridge and a steeper slope than that of the shed roof.
Remove the ledger and drill bolt holes where the bolt tips have left marks.
If you decide on a shallow pitch porch roof use 2 by 6 foot rafters.
First cut your rafter boards to size using a circular saw to make sure they fit your roof.
Make a cutting on one of the sides of the horizontal roof beam on an angle.
Attach the horizontal beam by using a nail gun.
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Flashing a patio roof ledger.
Joist hangers can help you mount each rafter to the house.
Fit rafter board into the u shaped hangers and nail it in place.
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Push or hammer the ledger back onto the bolts recheck for level making any needed adjustments add washers and nuts and then tighten the bolts.
The porch roof may match the pitch of your home or have a more shallow roof pitch.
After that to make it flush with the roof of the existing house cut the two outer rafters.
To build a shed roof you ll need rafter boards plywood gusset plates plywood sheathing felt roofing paper and shingles.
You have to do it thoroughly so that the rafters sit flush on it.
To tie the design together peter chose to cut the rafter tails off the extend the exterior wall up to the underside of the new roof.
Use screws to secure the rafter to the sill plate.
Kick it or keep it.
Attaching near the eaves the.
The next question is what to do with the existing eave under the new roof.