Rhode Island Journeyman Plumber Practice Exam

How many roof drains are required for a building that is 10,000 square feet or less?

1. 2

2. 3

3. 4

4. 5

The correct answer is: 4

For a building that is 10,000 square feet or less, the requirement for the number of roof drains is determined by plumbing code and best practices for efficient drainage. Generally, the standard practice is to have one roof drain for each 7,500 square feet of roof area. Consequently, a building with an area of up to 10,000 square feet should have at least two roof drains. However, it's essential to consider that the specific local plumbing code may dictate the exact number required based on additional factors, including roof design, slope, and anticipated rainfall. For buildings in challenging weather areas or with complex roof systems, more roof drains might be necessitated to handle potential water accumulation effectively, which is where the requirement for three drains might be better suited. The option stating four drains would typically apply to larger buildings or when specific conditions increase the need for effective drainage beyond the general standard, making it an overestimation for a space of this size. It is always crucial to consult the local plumbing codes and regulations, as they provide detailed guidelines that may vary by jurisdiction. In summary, the requirement for roof drains arises from ensuring proper water drainage to prevent pooling, water damage, and structural issues, with an ideal of proposing three drains