The use of valley board to nail down rafter in porch roof addition design.
How to attach a porch roof to an existing roof.
Existing patio is outside the dining room on the west side of the house.
Attaching below the ridge.
Adding a roof to your porch provides you and your porch with much needed protection from the sun wind rain snow and ice.
You just need some assistances of experts if you are not really good at carpentry.
In the case of a lean to roof over an addition the existing rafters will have to be cut away to accommodate the addition and the shed roof will require support where.
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.
Attaching a patio roof to an existing house is not a doddle but it does not mean that you cannot do it.
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This video looks at a couple of design options including attaching the roof ledger below that of the existing eaves and setting the patio roof atop the existing roof.
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.
The patio is essentially unusable on a sunny afternoon in the summer.
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