I am building a new garage and I will be installing a metal roof. The garage is only feet from the house which has a shingled roof with 1 ½ " drip edge over cedar fascia on the gable end. I am considering using drip edge over cedar fascia on the gable end of my metal garage roof instead of gable trim so it matches the house. Is this an acceptable practice for installing a metal roof? Or, does the metal roof need the gable trim to keep moisture out?