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.
How to tie into roof for a covered porch.
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.
Using lag bolts and a screwdriver fasten the base of the posts to the ground.
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.
Joist hangers can help you mount each rafter to the house.
Make sure the 2x4 joists are turned so the boards narrow edge faces the floor of the porch.
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 edge of the roof of the house and the frame to the porch should be seamless now.
Install the 2x4 joists with some screws and brackets to the house edge.
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I said all of that to say this.
The roof deck is 1x6 attached to the top of the rafters with 1 4 inch space between boards.
Use screws to secure the rafter to the sill plate.
You can either remove the eave or just keep it.
Measure the sightline clearance height from the roof to the house not the other way around.
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.
You have to make.
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.
I am no framer.
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.