Tying in to an existing gable roof.
How to connect a roof to an existing roof.
Add decking atop the roof and nail on metal flashing where the shed roof joins the existing roof.
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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.
Staple on roofing paper and shingle the new shed roof starting at the bottom and working up.
Remove siding from the house where the new roof will attach to expose rafters or other framing of the old roof.
Attach the horizontal beam by using a nail gun.
You ll need to remove the existing shingles and cut back the existing eaves to make room for the shed roof then nail a two by six ledger board on the existing roof.
You have to do it thoroughly so that the rafters sit flush on it.
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Reinstall the removed shingles or use new shingles to cover the area of the old roof which was exposed.
Attaching new roof to existing roof plans on how to attach a roof to another.
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After that to make it flush with the roof of the existing house cut the two outer rafters.