Counter flashing receivers in systems should be made of which material and thickness?

Counter flashing receivers in systems should be made of which material and thickness?

• A. Aluminum
• B. 16 oz copper
• C. 12 oz copper
• D. Stainless steel

Answer: (B)

Copper at 16 oz provides the right balance of strength and malleability needed for counter flashing receivers. Copper resists corrosion and ages gracefully with other copper flashings, helping maintain a tight, long-lasting seal in a roof system. The 16 oz thickness is thick enough to hold its shape under wind uplift and when fastened, reducing the chances of deformation or gaps that could cause leaks. Using thinner copper, like 12 oz, is more prone to denting or bending during installation and in service, which can compromise the flashing’s ability to shed water over time. Aluminum, while lighter, doesn’t offer the same durability and long-term performance in contact with other roofing metals, especially in Florida’s exposure conditions. Stainless steel is strong but unnecessary here and adds cost without providing a meaningful advantage for counter flashing receivers, and it can introduce compatibility concerns with copper components.

Copper at 16 oz provides the right balance of strength and malleability needed for counter flashing receivers. Copper resists corrosion and ages gracefully with other copper flashings, helping maintain a tight, long-lasting seal in a roof system. The 16 oz thickness is thick enough to hold its shape under wind uplift and when fastened, reducing the chances of deformation or gaps that could cause leaks.

Using thinner copper, like 12 oz, is more prone to denting or bending during installation and in service, which can compromise the flashing’s ability to shed water over time. Aluminum, while lighter, doesn’t offer the same durability and long-term performance in contact with other roofing metals, especially in Florida’s exposure conditions. Stainless steel is strong but unnecessary here and adds cost without providing a meaningful advantage for counter flashing receivers, and it can introduce compatibility concerns with copper components.