Because it prevents water damage and leaks from occurring on your roof, roofing blinking is a crucial component of any roofing system. Kresta Roofing, the top Roofing Company San Antonio, understands how important it is to protect your home from being damaged by standing water. Flashing is a type of waterproof material or thin metal strips that are attached to the roof at joints, angles, and other potential water entry areas. Flashing is considered to be a waterproof material.