My contractor proposes a sealing method for a roof curb

My contractor proposes a solution for waterproofing our ac roof curb.

He proposes to run roofing materials 1/2 way up the side of our metal curb. Then he will screw a counter flashing to the curb just above the roofing. Then he would seal the flashing to the curb with silicone calking.

Dose anybody have concerns with this method?

go back to your 1st post the answers are there–btw-doesn`t sound good to me!

flash it all the way up and in like you were told
here earlier, not by me offcourse.

fasten it directly to deck,
flash it up and in.