When installing a new roof, it is generally recommended to replace the flashing rather than reusing it. Roof flashing is an essential component of the roofing system that helps to prevent water from seeping into vulnerable areas, such as joints, valleys, chimneys, skylights, and vent pipes.
There are a few reasons why it is better to replace flashing during a roof installation:
Wear and tear: Flashing is exposed to the elements and undergoes significant stress over time due to expansion and contraction caused by temperature changes. Reusing old flashing may compromise its effectiveness as it could have become worn out, corroded, or damaged.
Compatibility: Different roofing materials may require specific types of flashing. When replacing the roof, there might be changes in roofing material or design that necessitate new flashing to ensure a proper fit and adequate protection.
Warranty and longevity: Many roofing material manufacturers offer warranties that might be voided if old flashing is reused. Installing new flashing can help maintain the warranty and the longevity of the roof.
Ensuring proper installation: Roofing contractors prefer working with new materials to guarantee a quality installation. Using old flashing may not fit as well or be as secure, potentially leading to leaks and other issues in the future.
However, there might be some exceptions where it's feasible to reuse flashing, such as when it's relatively new, in good condition, and compatible with the new roofing materials. Nonetheless, it's essential to consult with a professional roofing contractor to assess whether reusing existing flashing is a viable option or if it's better to replace it for optimal protection and performance. Remember that a well-installed and properly maintained flashing system is crucial for the long-term health and integrity of your roof.