The answer to 'lifespan of flashing' is that the average lifespan of metal flashing is 20-50 years, depending on the material and climate. Flashing is the thin metal or plastic material used to seal the joints and gaps around roofing features like chimneys, vents, and skylights. Proper installation and regular maintenance are key to maximizing the lifespan of flashing.
Factors that affect flashing lifespan include the material (aluminum, copper, and stainless steel last longer than galvanized steel), exposure to the elements, and the quality of the initial installation. In harsh climates with temperature extremes, flashing may need to be replaced every 15-20 years. Regular inspections and prompt repairs to any cracks or leaks can help extend the lifespan of your flashing.