The answer to 'how to install drip edge' is to install a metal or plastic drip edge along the edges of your roof to help direct water away from your home's siding and foundation. Drip edge helps prevent water damage and rot by guiding water off the roof and into your gutters. It's an important part of a properly installed roof system.
To install drip edge, start by measuring the length of your roof's edges and purchasing the appropriate amount of drip edge material. Position the drip edge along the roof's edge, overlapping the joints by a few inches. Secure the drip edge with roofing nails or screws every 12-18 inches. Make sure the drip edge extends past the edge of the roof by 1-2 inches to properly direct water flow. Finally, seal any gaps or seams with a compatible sealant.