Rhode Island Journeyman Plumber Practice Exam

What is the minimum strainer size for a floor drain?

1. 4 pounds per square foot

2. 5 pounds per square foot

3. 6 pounds per square foot

4. 7 pounds per square foot

The correct answer is: 4 pounds per square foot

The minimum strainer size for a floor drain is established based on the need to effectively manage drainage while preventing clogs from debris. The correct answer highlights that a strainer designed for a floor drain must have adequate drainage capacity to accommodate water flow while maintaining structural integrity under load. A strainer size of 4 pounds per square foot typically meets these criteria, ensuring that the floor drain can handle standard flow rates in areas prone to water accumulation. This specification is important because it ensures that the drain functions properly without risking overflow or blockage, particularly in commercial or high-traffic areas. Strainers that are too small or inadequately rated could lead to drainage issues, which compromise sanitation and can cause water damage. Proper size selection is crucial for maintaining effective plumbing systems, which is why the defined minimum is an essential element of plumbing codes and best practices.