||04-08-2009 09:38 AM
Perhaps a 2x6x12 would do the trick.
(Maybe even a 2x6x10?)...
Lay it along side the existing rafter and screw it to the existing rafter.
Staggering the screws apx. 12-16 inches apart.
It will be like a 'splice' to re-enforce the cracked 2x6x16 rafter.
Like this below: