The first step is to find out how many rafters are sagging and if anything else is damaged.
Hip roof rafter repair.
Measure the dimensions of the old rafters beneath your roofing surface.
If you are replacing the entire rafter screw down into the wood through the top and bottom joists.
If replacing part of the rafter attach one end of each sister board through the existing rafter.
The fact is that there are many things carpenters do that are allowed because we all know they work.
Use a circular saw to cut two sets of new rafters from the same size wood by the same dimensions.
Screw the new rafter into place.
Use your tape measure to record the distance of both rafter legs.
This video shows how to repair a split rafter.
However it is important to fix the rafters before doing any other work to the roof.
Of course we re talking about splicing a joist or rafter as part of a repair technique for a rotted termite damaged or over spanned joist.
You may find that several are in need of straightening and that some of the sheathing must be replaced.
Very easy to do.
Repeat the process for the joist beneath your old roof rafter.
Sometime we just need a longer piece of wood like a hip king rafter.