I said all of that to say this.
How to tie into roof for a covered porch.
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Position the rafters on top of the sill plate.
Joist hangers can help you mount each rafter to the house.
I am no framer.
You can either remove the eave or just keep it.
Use screws to secure the rafter to the sill plate.
Each 2x4 joist should extend across the frame by going from the house edge to the porch edge.
Using lag bolts and a screwdriver fasten the base of the posts to the ground.
If attaching a patio roof to a ledger beneath the eaves does not allow for enough headroom you can set the new patio roof s rafters on the wall s top plate.
The positioning of your rafters will depend on the pitch of the porch roof.
You could cut the new ridge board into the existing roof and tie it into the house rafters or trusses but i am not sure that is necessary.
The blocking is held low to hide the roof wall intersection and to provide a 1 inch air space at the top for a ventilation channel.
Measure the sightline clearance height from the roof to the house not the other way around.
Those 2x s create the bottom of your new valley and your jack rafters on the porch roof will extend from that up to your new ridge board.
The edge of the roof of the house and the frame to the porch should be seamless now.
You have to make.
The roof deck is 1x6 attached to the top of the rafters with 1 4 inch space between boards.
The porch roof may match the pitch of your home or have a more shallow roof pitch.
At the beam end the rafters are fastened with a 10 inch structural screw through the top of the rafter into the beam.
On a two story house you can usually tie the ledger into a band joist also called a rim joist located between the floors as shown below.
Measure the size of the beam that you are going to use.