Proper Dormer flashing - Remove siding and corner boards

It seems to me that in order to properly flash a dormer, or any other outside corner, the corner boards as well as the siding must be removed to wrap the corner correctly with I&W and metal flashing.

Is this an accurate assessment?

Thanks,

Alan

No, it depends on the siding and trim,and how it’s fastened, and you don’t really need to install I&W.

Thanks Dennis,

I was thinking masonite with 5/4 corner boards.

Dang, I thought I had that one nailed.

Guess I better get back on the meds :?

Alan

In a perfect world it is. we sometimes in a reroof specify taking this apart to apply all new flashing. sometimes we just pop off the corner boards and put in a new lead corner.