Roof deck strainers shall have a total net inlet area less than how many times the area of the outlet pipe they are connected to?

The requirement that roof deck strainers must have a total net inlet area that is less than two times the area of the outlet pipe they are connected to is critical for ensuring proper drainage and preventing water accumulation on the roof. This ratio helps maintain adequate flow and minimizes the risk of water backing up, which can cause structural damage and leaks.

When the inlet area exceeds twice the outlet area, it can lead to inefficient drainage. If the strainers allow too much water in at once without sufficient outlet capacity, this can overwhelm the system, leading to ponding on the roof or even compromising the integrity of the roofing structure over time. Thus, the specified ratio is designed to balance the inlet and outlet capacities, ensuring effective water management on the roof.

Understanding this principle is essential for proper design and installation in accordance with sanitation and building codes, which aim to prevent water-related issues and promote longevity in roofing systems.