Roof edge drainage is critical to preventing water infiltration and structural damage in parapet wall systems. The Zurn Z187 Oblique Scupper Drain offers a reliable and efficient way to channel water through parapet walls. With multiple size options, durable construction, and an angled oblique design, the Z187 is built to handle demanding drainage needs while protecting the building envelope.

Zurn Z187 Installation Schematic

What Is the Zurn Z187?

The Z187 is an oblique scupper drain available in two standard sizes: 6" x 7" and 8" x 12". Designed for parapet wall installations, it directs water away from the roof surface and through the wall, preventing ponding, leaks, and water intrusion into the building structure. Its angled construction allows for efficient flow and reliable long-term protection.

Key Features & Benefits

• Multiple Sizes: Available in 6" x 7" or 8" x 12" to suit different applications.
• Oblique Angle Design: Improves water flow efficiency and reduces debris accumulation.
• Durable Build: Made from high-quality materials for long service life in rooftop environments.
• Watertight Installation: Protects walls and roof edges from leaks and infiltration.
• Versatility: Suitable for both new construction and retrofit projects.

Zurn Brand Quality

Applications of the Z187

• Parapet wall drainage for commercial buildings
• Institutional facilities such as schools and hospitals
• Retrofit projects addressing roof edge drainage issues
• New construction requiring durable scupper solutions

Installation Best Practices

For maximum performance and watertight reliability:

• Install flush with the parapet wall for smooth water flow.
• Apply sealant around the drain to prevent infiltration.
• Confirm slope directs water efficiently toward the scupper opening.
• Inspect regularly to keep the drain clear of obstructions.

Zurn Z187 Schematic

Case Study: Institutional Roof Upgrade

Challenge: A university building with parapet walls suffered water damage due to insufficient roof edge drainage.

Solution: Engineers selected Zurn Z187 Oblique Scupper Drains for their angled design and size options. The scuppers were installed at strategic wall points to redirect water away from the building.

Outcome: The project eliminated wall leaks, reduced ponding, and extended the roof system’s lifespan—all while minimizing maintenance costs.

Conclusion

The Zurn Z187 Oblique Scupper Drain provides durable, watertight, and efficient parapet wall drainage. With its oblique design and multiple size options, it is an excellent solution for both new builds and retrofit projects seeking reliable roof edge protection.