Roof drainage plays a critical role in protecting structures from water damage, and the Zurn Z165 is one of the most trusted solutions in the industry. Designed for flat and low-slope roofs, the Z165 provides efficient water removal while maintaining long-term durability. In this guide, we’ll explore what makes the Zurn Z165 stand out, its applications, installation considerations, and a case study that highlights its performance in action.

Zurn Z165 Installation Schematic

What is the Zurn Z165 Roof Drain?

The Zurn Z165 is a primary roof drain engineered to efficiently collect and redirect water from flat or low-pitched roof systems. Its heavy-duty construction makes it suitable for commercial and industrial applications where reliability is paramount. With a large sump and dome strainer, the Z165 ensures rapid water flow while preventing debris clogs.

Key Features and Benefits

• Durable Construction: Made of cast iron with corrosion-resistant finishes for long-term use.
• Large Sump Design: Maximizes water flow, reducing pooling on rooftops.
• Dome Strainer: Prevents debris from entering the system while maintaining efficient drainage.
• Versatile Options: Available with different flange and dome materials to match project needs.

Zurn Brand Quality

Applications of the Zurn Z165

The Z165 is commonly specified for:

• Commercial buildings with flat roofs (warehouses, offices, and hospitals)
• Industrial facilities requiring heavy-duty drainage solutions
• Institutional projects such as schools and government buildings
• Retrofit or new construction projects needing reliable drainage performance

Installation Considerations

Proper installation is key to the Z165’s long-term performance. Contractors should ensure:

• Correct placement to align with roof slope and prevent pooling
• Sealed flanges for watertight integration with roof membranes
• Accessibility for maintenance and cleaning of the dome strainer

Zurn Z165 Specifications

Case Study: Zurn Z165 in a Distribution Center

A large distribution center in the Southeast faced challenges with heavy rainfall causing pooling on its expansive flat roof. After multiple roof repairs, engineers specified Zurn Z165 roof drains across the facility. The large sump design and dome strainers provided uninterrupted water flow, even during severe storms. Since installation, the facility has reported zero roof damage due to standing water, significantly reducing maintenance costs and protecting valuable inventory inside.

Conclusion

The Zurn Z165 offers the strength, reliability, and efficiency required for demanding roof drainage projects. Its robust cast iron design, large sump capacity, and dependable performance make it a go-to solution for contractors, engineers, and building owners. Whether for new construction or retrofit, the Z165 is a proven investment in long-term building protection.