Which phrasing matches the roof drain handling described?

• A. They are left car sealed open
• B. They are closed when not in use
• C. They are removed from service entirely
• D. They are covered with mesh screens

Answer: (A)

The important idea here is that roof drains are meant to remain open so water can flow away freely. Keeping the drain open prevents water from backing up on the roof, which can add unwanted weight, cause leaks, and create slip or ice hazards. If you sealed or closed the drain, you’d trap water and potentially cause pooling, corrosion, or structural stress. Removing the drain from service defeats its purpose and would require an alternative drainage plan, which is not desirable. Putting a mesh screen on the drain might seem protective, but it can quickly clog with debris and still restrict water flow, defeating the purpose of rapid drainage. So, the best approach is to keep the roof drain open to allow proper drainage.