Adding a gable roof to an existing roof is no small project and is best left to the professionals.
How to attach a flat 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.
Adding a roof to your porch provides you and your porch with much needed protection from the sun wind rain snow and ice.
Attaching below the ridge.
Installing a new roof over an existing one also called a layover or nailover is often possible although not always the best option.
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Add decking atop the roof and nail on metal flashing where the shed roof joins the existing roof.
This method may be one of the most ubiquitous ways of attaching a patio roof.
To do this method you will have the back channel and fascia strengthened by reinforcing two.
Staple on roofing paper and shingle the new shed roof starting at the bottom and working up.
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.
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.
However you can have an understanding of the work being done or even do it yourself if you have prior experience with roofing projects.
How to install a roof over an existing roof.
Existing patio is outside the dining room on the west side of the house.
Reinstall the removed shingles or use new shingles to cover the area of the old roof which was exposed.
Fix the back channel to the fascia boards underneath the gutter directly.
However you must ensure the new porch roof matches with your existing roof seamlessly to enjoy these benefits.
Several methods exist based on the current roof design.