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.
How to attach a porch roof to existing house.
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Attach the horizontal beam by using a nail gun.
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.
Using two inch by four inch studs build a frame for columns that stand from the porch floor to the soon to be built roof.
Determine how high it must be to provide an adequate slope to the roof.
After that to make it flush with the roof of the existing house cut the two outer rafters.
Based on the size of the new addition that you wish to have to cover the porch area attach a valley board by nailing it down on the existing roof.
Brace the column frame in place using l brackets and concrete screws.
Find the wall studs or roof trusses that will have to support the ledger.
For example you will need more when the new roof that you choose is in hip style.
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Look in an attic if the location is on a roof slope or check the interior walls to find studs.
Place the rafters on 24 centers attach them to the settle joists and beams toward the center.
Attach the rafters to the house with joist hangers which supported by ledger boards.
One thing that you need to understand here is that a different design will require different numbers of the board.
Make it the full width of the porch or slightly wider depending on your porch design.
If you have a square porch you need support columns at the two corners farthest from the house.
You have to do it thoroughly so that the rafters sit flush on it.