You may need a structural engineer to help with design of trusses and rafters.
Framing a new roof into an existing roof.
The bottom of our blind valley was about 30 inches short of the bottom of the porch roof so we extended the line of the valley down to the edge of the new roof.
Shingle the addition roof letting the new shingles fold through the valley center and onto the old roof deck by at least 1 ft.
You will need building help and a large construction dumpster for debris.
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However the glare of the sunlight or the pouring rain will ruin it.
It is not a job for beginners.
After the shed roof framing is complete finish the lean to along with any part of the existing roof from which you ve removed shingles with new shingles to blend the lean to into the old roof.
Fasten a ridge board on the new roof if there is one to the ridge board on the existing roof if it has one.
However you must ensure the new porch roof matches with your existing roof seamlessly to enjoy these benefits.
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Re lay the shingles you removed from the existing roof.
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Therefore you need to install a patio roof.
Bed the end of each shingle in a 2 in wide ribbon of roofing cement placed 4 in.
Spending time by relaxing on a patio is a great idea.
Wrapped up framing to get roof ready for sheathing.
If you have basic carpentry skills and understand basic framing techniques you can attach a porch roof to a house.
It does not only protect you from the heat and rain but it also accentuates your house.
Up from the valley center.
Tying a gable roof into an existing roof is a long expensive project usually undertaken only when there is a major addition or renovation to a house.