Several methods exist based on the current roof design.
How to attach a flat roof to an existing roof.
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.
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Add decking atop the roof and nail on metal flashing where the shed roof joins the existing roof.
To do this method you will have the back channel and fascia strengthened by reinforcing two.
Attaching below the ridge.
Existing patio is outside the dining room on the west side of the house.
Here are 7 different ways of attaching a patio roof to an existing house that you can apply.
Installing a new roof over an existing one also called a layover or nailover is often possible although not always the best option.
Adding a roof to your porch provides you and your porch with much needed protection from the sun wind rain snow and ice.
Fix the back channel to the fascia boards underneath the gutter directly.
However you can have an understanding of the work being done or even do it yourself if you have prior experience with roofing projects.
The patio is essentially unusable on a sunny afternoon in the summer.
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.
Staple on roofing paper and shingle the new shed roof starting at the bottom and working up.
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.
This method may be one of the most ubiquitous ways of attaching a patio roof.
How to install a roof over an existing roof.
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.