What is the minimum weight of sheet copper used for vent pipe flashing?

The minimum weight of sheet copper used for vent pipe flashing is specified as 8 ounces per square foot. This standard is set to ensure durability and resistance to the elements, especially in a city like New York where weather conditions can lead to wear and tear. Copper provides a reliable barrier against moisture, which is crucial for preventing leaks and water damage around vent pipes.

Using this weight ensures that the flashing is thick enough to withstand the physical stresses from wind, rain, and snow, thus promoting the longevity of the installation. Thicker materials, while available in other options, may not be necessary for all applications and may increase costs unnecessarily, while lighter materials would risk failure, making 8 oz per ft² a balance between durability and practicality.