Measure the width at one.
Broken rafter in attic.
If the rafter is completely exposed you re in luck.
Locate the split rafter.
Add a 2nd rafter to the damaged one the rafter with the same size piece of lumber.
Overview from time to time an attic rafter will split along a knot typically after having a new roof installed because of the workers walking around on it.
Fixing a cracked or split rafter in your attic ensures that the roof will receive the necessary support.
Rafters can also be damaged by a blow to the roof from falling branches.
Although the rafter must be replaced if it is completely broken smaller areas of damage can be repaired through the application of a scab board.
Repairing this is called scabbing.
Some say you only have to patch the damaged area going a few few beyond the crack on either end but if you can sister the whole thing and you wont need to worry about future potential cracks.
Obviously this is not a good situation as it can cause the entire roof to fail if not addressed.
Beams sadly are a different story.
A rafter might split when heavier roof tiles are installed or if the rafter has.
This board is a section of lumber that is the same thickness as the rafter and 2 feet longer on each side of the damaged section.
You actually don t have to remove the broken rafter you can put the new one in right next to it.