Roof drainage is a crucial factor in protecting buildings from water damage, and the Zurn Z163 is designed to deliver consistent, reliable performance. As a heavy-duty primary roof drain, the Z163 is engineered for commercial and industrial projects, offering a combination of durability, flow efficiency, and easy integration with modern roofing systems. This guide provides an overview of the Z163’s key features, where it excels, installation best practices, and a case study demonstrating its performance.

Zurn Z163 Roof Drain Schematic

What Is the Zurn Z163?

The Zurn Z163 is a primary roof drain built from Dura-Coated cast iron. It includes a secured flashing clamp with gravel stop, an integral sump receiver for stability, and a domed strainer to maximize water intake while preventing clogging from debris. Its design makes it ideal for flat or low-slope roofs where efficient stormwater removal is essential.

Key Features & Benefits

• Cast Iron Construction: Ensures long service life and corrosion resistance.
• Dome Strainer: Increases intake area and prevents debris from entering the system.
• Flashing Clamp with Gravel Stop: Provides a watertight seal with roofing membranes and prevents gravel intrusion.
• Integral Sump Receiver: Improves drain stability and flow performance.
• Versatile Outlets: Available with multiple outlet sizes and types to fit project requirements.

Zurn Brand Quality

Applications of the Z163

• Commercial buildings such as offices, malls, and hospitals
• Industrial facilities with large roof areas
• Institutional buildings including schools and government facilities
• Retrofits where upgrading drainage systems is necessary to meet code or performance needs

Installation Considerations

To achieve maximum performance from the Zurn Z163, proper installation is vital. Position drains at the lowest roof points to ensure natural flow, use the flashing clamp to secure a watertight seal with membranes, and confirm outlet sizing matches hydraulic requirements. Regular access for inspection of the dome strainer should also be part of the installation plan.

Zurn Z163 Dimension Schematics

Case Study: Healthcare Facility Upgrade

Challenge: A regional hospital with a flat roof faced frequent ponding issues during heavy rain events. Maintenance crews often had to clear clogged drains, increasing costs and risks.

Solution: The facility installed multiple Zurn Z163 roof drains. The integral sump receiver provided enhanced stability, while the dome strainer and gravel stop minimized clogging from debris and ballast.

Outcome: Ponding issues were eliminated, and maintenance frequency was reduced by 50%. Staff reported improved roof performance and fewer emergency service calls, ensuring patient safety and protecting the facility’s infrastructure.

Conclusion

The Zurn Z163 Roof Drain is a proven solution for commercial and industrial drainage needs. Its cast iron durability, efficient water intake, and user-friendly design make it a smart choice for both new construction and retrofits. With proper installation and routine maintenance, the Z163 helps safeguard buildings against the risks of water damage and roof deterioration.