I said all of that to say this.
How to tie into roof for a covered porch.
Joist hangers can help you mount each rafter to the house.
You have to make.
Position the rafters on top of the sill plate.
The positioning of your rafters will depend on the pitch of the porch roof.
I am no framer.
Measure the size of the beam that you are going to use.
You can either remove the eave or just keep it.
Install the 2x4 joists with some screws and brackets to the house 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 roof deck is 1x6 attached to the top of the rafters with 1 4 inch space between boards.
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.
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Make sure the 2x4 joists are turned so the boards narrow edge faces the floor of the porch.
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.
Use screws to secure the rafter to the sill plate.
Measure the sightline clearance height from the roof to the house not the other way around.
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.
The porch roof may match the pitch of your home or have a more shallow roof pitch.
Each 2x4 joist should extend across the frame by going from the house edge to the porch edge.