Not all roofs involve drip edges and ice obstacles, but they have to be set up right before anything if you are doing will need them. The metal drip edge can help direct drinking water away from the roof and will prolong out about three/4 inches more than the fascia. https://creativewritehub.com/top-5-roofers-in-downers-grove-illinois-for-residential-roofing-expert-services-reviewed/