The answer to 'how to install flashing' is to properly install metal or other waterproof material around roof openings, edges, and joints to prevent leaks. Flashing helps direct water away from vulnerable areas of the roof and creates a weathertight seal. This is an essential roofing maintenance task that should be done regularly to protect your home from water damage.
To install flashing, first measure the area and cut the flashing material to size. Apply a bead of roof sealant or adhesive to the surface, then press the flashing firmly into place. Secure it with roofing nails or screws, overlapping seams by at least 2 inches. Seal all edges and nail holes with additional sealant. Proper flashing installation is critical, so it's best to have a professional roofer handle this task if you're not experienced with roofing work.