How to properly flash octagon gable vent?

Question

I dont have any trouble flashing square, rectangle, or triangle windows and vents. When it comes to round and octagon shapes I typically just make it work with lots of caulking. Is there a diagram or manual online somewhere that shows the correct way to flash these odd shapes?

Answer 1

Why would you be flashing them and what are you doing the flashing with?

Answer 2

Use coil stock or roof step flashing and window wrap.