Massachusetts Plumbers Journeyman Practice Exam

When using Sheet Copper for specific applications, what is the minimum thickness per square foot?

1. 6 ounces

2. 9 ounces

3. 12 ounces

4. 15 ounces

The correct answer is: 12 ounces

The correct choice regarding the minimum thickness of sheet copper for specific applications is indeed tied to the requirements in the plumbing code and industry standards. Typically, sheet copper is measured by weight, and the thickness is specified in ounces per square foot. For plumbing and certain roofing applications, a minimum thickness of 12 ounces per square foot is commonly used. This thickness ensures adequate durability and resistance against elements such as corrosion, which is particularly important in plumbing applications where the material will be in constant contact with water. Other thickness weights like 6 ounces, 9 ounces, and 15 ounces do exist, but they are generally used for different types of applications. For example, lighter weights would not provide the necessary durability for demanding plumbing applications, while heavier gauges may be used where additional strength is required but are not considered a minimum standard for general plumbing use. Thus, a minimum thickness of 12 ounces effectively balances the need for both durability and practicality in most plumbing scenarios.