Attach the horizontal beam by using a nail gun.
How to attach a porch roof to existing house.
Brace the column frame in place using l brackets and concrete screws.
For example you will need more when the new roof that you choose is in hip style.
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Find the wall studs or roof trusses that will have to support the ledger.
Place the rafters on 24 centers attach them to the settle joists and beams toward the center.
You have to do it thoroughly so that the rafters sit flush on it.
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.
Look in an attic if the location is on a roof slope or check the interior walls to find studs.
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.
Make sure to check the vertical beam to ensure that the end rafters are placed securely.
One thing that you need to understand here is that a different design will require different numbers of the board.
Attach the rafters to the house with joist hangers which supported by ledger boards.
Determine how high it must be to provide an adequate slope to the roof.
Make it the full width of the porch or slightly wider depending on your porch design.
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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.
Make a cutting on one of the sides of the horizontal roof beam on an angle.
Attach the rafters to the ledger boards and settle joists.