Attach a sill.
How to add a back porch roof.
Use thru bolts for a solid and strong connection.
If you have a square porch you need.
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Attach the horizontal beam by using a nail gun.
You have to do it thoroughly so that the rafters sit flush on it.
Make a cutting on one of the sides of the horizontal roof beam on an angle.
Install the header beam.
Acquire any necessary building permits before.
Notice that the tops of the 6x6 support posts are notched to hold the header beam.
Install the 2 2x10 header beams to the notched 6x6 support posts.
Build support columns to help support the weight of your porch roof.
After that to make it flush with the roof of the existing house cut the two outer rafters.
Install temporary bracing to keep the support posts level and in place.