Zurn Side Outlet Roof Drain: A Comprehensive Guide for Pros and Homeowners

The Zurn Side Outlet Roof Drain is a key component for efficient roof drainage in commercial and residential applications. Designed to manage rainwater while minimizing the risk of backflow and debris buildup, these drains are a go-to for many specifiers and contractors. This article explores features, performance, installation considerations, compatibility, and maintenance tips to help users select and use Zurn side outlet roof drains effectively.

What Is a Zurn Side Outlet Roof Drain?

A Zurn side outlet roof drain is a rainwater collection and discharge device installed at the roof plane. Unlike traditional center-discharge models, side outlet designs route water horizontally into the drainage system, which can simplify piping runs and reduce the vertical rise needed in some configurations. Zurn’s side outlet lines emphasize corrosion resistance, robust strainer assemblies, and reliable clamping and sealing to prevent leaks at the roof connection.

Key Features and Benefits

• Durable Construction: Many models use corrosion-resistant materials such as cast iron or brass, with protective coatings suitable for varied climates.
• Efficient Water Capture: High-capacity bowl and strainer reduce overflow during heavy rainfall and limit debris intrusion.
• Backwater and Flood Protection: Integrated features or compatible accessories help prevent backflow and water backup into the roof assembly.
• Flexible Outlet Configuration: Side outlet orientation supports convenient piping layouts and easier maintenance access.
• Standardized Sizing: Available in multiple nominal diameters to fit typical roof studies and planning documents.

Materials, Sizes, and Compatibility

Zurn side outlet roof drains come in various materials, including cast iron with hydro-coated finishes and brass options for specific chemical or UV exposure considerations. Typical sizes range from 2 inches to 4 inches in outlet diameter, with corresponding strainer sizes designed to handle different rainfall intensities and roof areas. It is essential to verify compatibility with the selected roof membrane, deck thickness, and clamping rings. When selecting a Zurn side outlet roof drain, refer to the manufacturer’s data sheet for allowable water flow, pressure ratings, and installation clearances.

Installation Considerations

Correct installation ensures optimal performance and longevity. Key steps include:

• Roof Deck Preparation: Ensure a clean, stable substrate with proper slope toward the drain for efficient drainage.
• Membrane Compatibility: Use suitable gaskets and flashing components to seal between the drain base and roof membrane.
• Outlet Piping: Plan for a horizontal outlet run that aligns with the side outlet orientation to minimize elbow resistance.
• Backwater and Venting: Install backwater valves or consider venting strategies per local codes to prevent siphon and backflow issues.
• Sealing and Fastening: Tighten clamping rings and verify gasket seals without over-tightening to avoid damage.

Code and Compliance Considerations

Roof drain installations must meet local and national codes, including plumbing, roofing, and floodplain requirements. Some standards commonly referenced include the International Plumbing Code (IPC), International Residential Code (IRC), and regional building codes in the United States. When specifying Zurn side outlet roof drains, it is important to confirm:

• Drainage Capacity: Flow rates should match roof area and rainfall intensity in the project’s region.
• Material Compatibility: Ensure chosen materials resist corrosion and chemical exposure appropriate to the building environment.
• Sealing Requirements: Proper flashing details and gasket materials must be used to prevent leaks around the roof penetrations.
• Maintenance Access: Adequate access for inspection and cleaning is required by code and best practices.

Maintenance, Cleaning, and Troubleshooting

Regular maintenance extends the life of Zurn side outlet roof drains and reduces the risk of clogs and leaks. Recommended practices include:

• Periodic Cleaning: Remove debris from the strainer and verify the outlet is free of obstructions after heavy storms.
• Seal Inspection: Check gaskets and seals for signs of wear or cracking and replace as needed.
• Leak Detection: Inspect the drain area for moisture around the roof and along the flashing, especially after temperature fluctuations.
• Backwater Valve Checks: If a backwater device is installed, test functionality according to the manufacturer’s guidelines.
• Winter Considerations: In freezing climates, ensure proper insulation and heat tracing where required to prevent ice blockage.

Performance Tips and Best Practices

• Sizing Strategy: Size the drain to handle the 25–100-year rainfall event for the project location to avoid overtopping.
• Outlet Routing: Favor short, straight runs with minimal bends to reduce head loss and improve flow efficiency.
• System Integration: Coordinate with gutters, downspouts, and overflow paths to ensure balanced drainage.
• Inspection Frequency: Schedule seasonal inspections and post-storm checks to identify potential issues early.

Comparisons with Other Roof Drain Solutions

Compared with center-discharge models, Zurn side outlet roof drains offer advantages for specific roof geometries and piping layouts. Side outlet designs can simplify tradeoffs between deck space and drainage efficiency, particularly when space constraints limit vertical drain arrangement. For projects with tight roof-to-piping interfaces, a side outlet drain may reduce the need for extra elbows and transitions, potentially lowering installation time and materials cost.

Warranty, Support, and Availability

Zurn products typically include a manufacturer’s warranty that covers defects in materials and workmanship for a defined period. Availability varies by region and distributor, with common channels including plumbing supply houses, roofing suppliers, and Zurn-authorized distributors. When purchasing, obtain product data sheets, installation manuals, and any recommended spare parts to ensure long-term serviceability.

Practical Buying Guide

• Define Roof Area and Local Rainfall: Use this to estimate required drainage capacity.
• Choose Material and Finish: Cast iron with protective coatings for durability; brass where chemical exposure is a concern.
• Verify Outlet Size: Match to existing piping and the intended side outlet run.
• Assess Access for Maintenance: Ensure sufficient clearance around the drain for strainer removal and cleaning.
• Consult Specs: Review Zurn datasheets for flow rate, dimensions, and installation instructions.