Not all roofs have to have drip edges and ice boundaries, but they have to be installed before the rest if you need to do have to have them. The metallic drip edge helps direct water away from the roof and will prolong out about 3/4 inches above the fascia. https://creativewritehub.com/top-5-roofers-in-downers-grove-illinois-for-residential-roofing-expert-services-reviewed/