What is the minimum thickness of corrosion-resistant metal required for flashing and counterflashing?

The minimum thickness of corrosion-resistant metal required for flashing and counterflashing is specified as 0.019 inches. This standard thickness is established to ensure adequate protection against corrosion and to maintain the integrity of the flashing system in various environmental conditions. Flashing serves a crucial role in directing water away from critical areas of a building, such as roof junctions and penetrations, thereby preventing water intrusion and potential damage.

Using metal that meets the minimum thickness requirement helps ensure durability and performance over time. A thickness of 0.019 inches balances strengthened resistance to environmental factors while remaining manageable in terms of installation and cost. A thinner material may not provide sufficient long-term protection and durability, while a thicker material could unnecessarily increase costs and weight without a proportional benefit for standard applications.