I've decided to add rafter ties to my home. Im thinking of using cable.
1952 house. This house was built with NO rafter ties and very few collar ties. The joists run from gable to gable. Ridge is not sagging, walls are not bowing. However, I have added hurricane straps and gable supports. Soon, i will be replacing the roof and while at it, screwing the roof planking to the rafters. Im making my home as hurricane resistant as possible.
Therefor I have also decided to add cable rafter ties and 2x6 collar ties.