How To Attach A Shed Roof To An Existing Roof

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.

How to attach a shed roof to an existing roof.

First cut your rafter boards to size using a circular saw to make sure they fit your roof. After that to make it flush with the roof of the existing house cut the two outer rafters. In any case the structure that the shed roof is leaning on is an existing roof typically a gable roof with a ridge and a steeper slope than that of the shed roof. The porch roof may match the pitch of your home or have a more shallow roof pitch.

Add decking atop the roof and nail on metal flashing where the shed roof joins the existing roof. Choose a roof pitch 3 12 and roof structure 2x6 this places the new roof on top of the existing roof. Push or hammer the ledger back onto the bolts recheck for level making any needed adjustments add washers and nuts and then tighten the bolts. You have to do it thoroughly so that the rafters sit flush on it.

Attach the horizontal beam by using a nail gun. The positioning of your rafters will depend on the pitch of the porch roof. Remove the ledger and drill bolt holes where the bolt tips have left marks. Flashing a patio roof ledger.

Make a birdsmouth notch at the end of each rafter to help it fit into place. Joist hangers can help you mount each rafter to the house. The next question is what to do with the existing eave under the new roof. Use screws to secure the rafter to the sill plate.

Install shed rafters from the ledger board to the outer wall using metal rafter hangers which attach to the ledger board with screws or nails. If you decide on a shallow pitch porch roof use 2 by 6 foot rafters. Fit rafter board into the u shaped hangers and nail it in place. To build a shed roof you ll need rafter boards plywood gusset plates plywood sheathing felt roofing paper and shingles.

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