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How to put a addition on a roof.
Kick it or keep it.
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Choose a roof pitch 3 12 and roof structure 2x6 this places the new roof on top of the existing roof.
If the addition s roof mimics the look of the existing roof lines it won t stick out as an obvious add on.
To tie into the side of an existing roof put a new roof truss on the walls of the addition brace it upright then snap chalklines on the shingles to mark the center line of the new roof valleys where old and new roofs will connect.
Wrapped up framing to get roof ready for sheathing.
Take careful measurements to determine how many trusses you will need.
This is the simplest solution a single slope that s attached to the original house at the high point and slants down to the outer wall of the addition.
To tie the design together peter chose to cut the rafter tails off the extend the exterior wall up to the underside of the new roof.
The next question is what to do with the existing eave under 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.
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It also helps to copy the pitch of the existing roof since it likely takes important.
It s easy for the contractor to build and easy on the homeowner s budget says schultz but it makes the new space look like an obvious add on.