If you decide on a shallow pitch porch roof use 2 by 6 foot rafters.
How to attach gable porch roof to house.
A house attached patio roof takes advantage of the house s structure by supporting one end of the roof on a ledger mounted horizontally to the house.
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Secure the truss that is closest to the house first with nails on both sides.
Step 1 position the porch truss.
That usually is done with a header or ledger board secured to the house.
The ledger typically a 2 by 6 is usually designed to hold one end of the patio roof rafters.
The porch roof may match the pitch of your home or have a more shallow roof pitch.
Extend a cord or line on the level from the truss s peak to the roof line s highest peak.
A common element in adding porch roofs is fastening one end to the house either to a wall or to a roof.
Use screws to secure the rafter to the sill plate.
Start nailing the ridge board to the gable roof.
The complexity of the job will vary with the size of roof from a simple entryway covering to one over a large screened in area.
Position and secure the gable porch truss flat against the top plate of the porch s end.