Things like the material of your roof, the size of your roof, the extent of the issue, and how many stories your house has will all affect the total cost. Roof flashing creates a barrier against the elements around valleys, chimneys, vents, and other areas that penetrate the roof. If this metal flashing is coming loose, cracked open, or worn down, it can allow leaks. Our editorial team is committed to creating independent and objective content focused on helping our readers make informed decisions. To help support these efforts we receive compensation from companies that advertise with us. It takes coordination between project managers and various vendors as well as a working knowledge of the intricacies of construction project planning and scheduling.