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 add a patio cover to existing roof.
Go to the same height as the existing roof if you want to have a clean look and make the patio cover flush with the existing roof you need to strengthen the fascia and back channel by reinforcing the rafters inside the existing roof.
Install some riser brackets for more height.
Place the rafters on 24 centers attach them to the settle joists and beams toward the center.
If you re not ready to take this project on yourself give greatway roofing a call for a free estimate at 805 523 2550.
Calculate the sightline clearance height about 6 feet 2 inches in this case.
When you are building a patio cover off of an existing roof or wall you must take all of your measurements from the point at which the patio roof will attach to the existing structure not the outside of the slab.
Determine the beam size.
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How to add a covered patio roof an existing line.
Choose a roof pitch 3 12 and roof structure 2x6 this places the new roof on top of the existing roof.
Attach the rafters to the house with joist hangers which supported by ledger boards.
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Most common ways to attach a patio roof to an existing house.
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Fix the back channel to the fascia boards underneath the gutter directly.
Work from the view back not from the house out.
Then fix the back channel to the fascia boards underneath the gutter directly.
The existing slab can vary considerably throwing off crucial measurements.
Attach the rafters to the ledger boards and settle.
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Make the patio roof a little bit higher.
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.
8 inches in this case.