For example you will need more when the new roof that you choose is in hip style.
How to attach a porch roof to existing house.
Attach the horizontal beam by using a nail gun.
Make it the full width of the porch or slightly wider depending on your porch design.
Attach the rafters to the ledger boards and settle joists.
Find the wall studs or roof trusses that will have to support the ledger.
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.
Look in an attic if the location is on a roof slope or check the interior walls to find studs.
Make sure to check the vertical beam to ensure that the end rafters are placed securely.
Make a cutting on one of the sides of the horizontal roof beam on an angle.
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You have to do it thoroughly so that the rafters sit flush on it.
Determine how high it must be to provide an adequate slope to the roof.
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.
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If you have a square porch you need support columns at the two corners farthest from the house.
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.