Adding a roof to your porch provides you and your porch with much needed protection from the sun wind rain snow and ice.
How to attach a porch roof to an existing roof.
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.
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.
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However you must ensure the new porch roof matches with your existing roof seamlessly to enjoy these benefits.
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.
Attaching a patio roof to an existing house is not a doddle but it does not mean that you cannot do it.
The use of valley board to nail down rafter in porch roof addition design.
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Attaching below the ridge.
You just need some assistances of experts if you are not really good at carpentry.
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.
The patio is essentially unusable on a sunny afternoon in the summer.