Extending Existing Gable Roof

Where the overhang created is more than 450 mm and the roof is constructed with rafters the outrigger may need to extend back at least 900 mm.

Extending existing gable roof.

This may require removal of a second rafter. 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. But it is important that the roof pitch is exactly the same as the existing roof because you will see it from one roof to the other if it isn t. For the arrangement of the gable end overhang for the standard roof you lengthen the ridge beam beyond the facade for previously verified length using cut rafters.

For pitched roofs outriggers can be supported on the top of the gable wall end framing and extend back to the next truss or to a rafter. You may need a structural engineer to help with design of trusses and rafters. With the roof pitch the same it doesn t matter if the new addition is slightly off in height or lined up front to back because you re going over or under the old roof. If you re adding to the gable end of the house the side wall that goes up to the roof s peak it s fairly easy to extend the existing roofline over the new space says curt schultz a realtor architect builder in pasadena calif.

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. You will need building help and a large construction dumpster for debris. Attaching near the eaves. Then load bearing roof beams fixed to the trusses are extended in the same way.

However for larger extensions you ll need to hire a professional to get up there and remove large portions of the roof before extending the overhang. In the past i ve built ladders out of the same size rafter material and lagged screwed them into the gable rafter and then cut the sheathing back and re lay it after the extensions were added. How to extend gable end roof overhang. It is not a job for beginners.