Roof walking
 

I have repair to make at ridge of 12/12 roof. What is the safest way to climb up and down the roof. It's a 1 1/2 story built in 1997.

You won't be able to walk on a 12/12 roof safely without help. Depending on how much you need to move around, you can just lay a secured ladder on the roof to climb on or just use a safety rope/harness. Or, you could rent a manlift and it would be easier still. You would be surprised how cheap they are...

Build an arch parallel to your roof, by using this you can climb on top of the building and make necessary changes to your roof.

This post is from a year ago, I think he probably has the repair made by now.