when I did my DP i used the 1" wide 25 foot roll ( that went from the flange to the bottom of the curve) but if your going from header and UP the 100ft will be enough
I used what you sent me to wrap almost all of that dp. I would also think it depends on how you are planning on wrapping it. I think you sent me 25 feet so I would also agree that 100 should do you just fine.