I limit the overhang to 2 ft.
Extending existing roof overhang.
This meaning that if you plan on extending the rafter 12 inches you should extend the sister 24 inches from the bottom of the old rafter up.
Wider overhangs would require some engineering to ensure adequate support.
Extending a gable roof can be tricky since it involves working on the roof but you may be able to do it yourself if you only need to add 1 2 2 inches 1 3 5 1 cm.
However longer extensions will require large portions of the roof to be removed first and this task is best completed by a.
Cut rafter tail extensions three times the length of the overhang that you want to add using lumber the same size as the existing rafters.
When extending rafters the rule of 2 to 1 is usually sound.
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.
If you only need an additional 1 2 2 inches of overhang this can easily be achieved as a diy project.
Start conventional overhangs by taking off the existing fascia and any other trim that covers the rafter tails.
A good estimate for a contractor to do this same roof overhang extension would range from 50 to 85 per running foot.
The installation of simple overhangs on a house involves nailing rafter extensions onto existing rafters.
The cost of extending my 30 foot long roof overhang 14 inches was 340 or 11 50 per running foot for materials.