According to the manufacturer Evergreen Wholesale, JointFlash is a fast, easy-to-install flashing solution that slides conveniently behind siding and stays securely in place as you nail, eliminating the need for on the job cutting, while improving the durability of fiber cement and wood lap siding. JointFlash is a type of junction flashing made entirely from carbon black high density polyethylene (HDPE). To use, as JointFlash explains, simply install the first pieces of lap siding without nailing the end near the butt joint. Next, tuck the piece of JointFlash behind the loose end of the previously installed siding, making sure the JointFlash is centered on the joint and is overlapping by at least 1鈥�. Install the next piece of siding and nail down the butt joint as usual to hold the JointFlash securely in place.聽
