Best Side Outlet Roof Drain: Top Picks for Quick Roof Drain Installations
Answering your search for a side outlet roof drain, this guide highlights five solid options suited for different roof types and climates. Best for durable, long-lasting installations are the Marathon RD-200-SO models; choose Copperlab if you need no-hub configurations with optional overflow; Zurn Wilkins fits traditional cast-iron systems; the Marathon Economy Aluminum Retrofit is ideal for retrofit projects; and GXTPGHK’s cast iron variants offer an economical option for steady performance. Below is a quick buying table and concise product overviews to help you compare at a glance.
| Product | Best For | Key Benefit |
|---|---|---|
| Marathon RD-200-SO Small Body Side Outlet Roof Drain | New installations requiring durable cast iron with side outlet | Heavy-duty epoxy coated, integral gravel stop, standard dome |
| Copperlab Side Outlet Roof Drain Fitting Size: 4″ No Hub | Three-inch and four-inch no-hub piping systems | Flexible configurations, optional overflow |
| Copperlab Side Outlet Roof Drain with Overflow Fitting Size: 3″ No Hub | Overflow-capable setups for flat roofs | Overflow option available, multiple clad options |
| Zurn Wilkins ZC100-4NH Roof Drain | Traditional threaded side outlet with no hub compatibility | Cast iron, durable coating, multiple thread sizes |
| Marathon Economy Aluminum Retrofit Roof Drain | Retrofit projects needing lighter weight | Heavy gauge spun aluminum, bolt-down strainer |
Marathon RD-200-SO Small Body Side Outlet Roof Drain
- Brand: Marathon Roofing Products
- Material: Epoxy coated cast iron
- Features: Flashing clamp, integral gravel stop, self-locking polyethylene dome, no hub outlet
- Best for: New or replacement roofs needing heavy-duty side outlet drainage
The Marathon RD-200-SO is designed for harsh climates and heavy use. It offers a robust side outlet connection and included components that simplify installation. A potential limitation is that its heavy metal construction may require more effort during handling on elevated roofs.
Marathon RD-200-SO Small Body Side Outlet Roof Drain
- Brand: Marathon Roofing Products
- Features: Same core design as RD-200-SO with flashing clamp and gravel stop
- Best for: Customers comparing equivalent RD-200-SO models from Marathon
Designed for reliable performance, this variant emphasizes compatibility with common roofing assemblies. Use when you want a proven side-outlet solution with standard dome and outlet options. Consider the standardization across Marathon family products to simplify stocking and maintenance.
Marathon RD-200-SO Small Body Side Outlet Roof Drain
- Brand: Marathon Roofing Products
- Features: Same as other RD-200-SO listings
- Best for: Budget-conscious buyers seeking standard side outlet performance
Note: The three Marathon RD-200-SO variants share core construction. Select the listing that matches your outlet and flashing needs. Best for straightforward installations where no hub and dome configurations are already defined.
Copperlab Side Outlet Roof Drain Fitting Size: 4″ No Hub
- Brand: Copperlab
- Size/Outlet: 4″ No Hub
- Features: Optional overflow, available in TPO/PVC clad variants
Best for: Roofs with no-hub piping needing a side outlet; overflow options add safety against heavy rain. Limitation: Overflow feature appears as an option and may require additional components for full integration.
Copperlab Side Outlet Roof Drain with Overflow Fitting Size: 3″ No Hub
- Brand: Copperlab
- Size/Outlet: 3″ No Hub
- Features: Overflow option; multiple clad versions
Best for: Retrofit or new flat-roof installations where overflow capacity is desired. Choose this if you need a compact 3″ no-hub solution with overflow potential. Limitation: Fewer rigid specs on overflow setup without additional details.
Zurn Wilkins ZC100-4NH Roof Drain
- Brand: Zurn Wilkins
- Outlet: 3″ Threaded Side Outlet, No Hub option
- Features: Dura-Coated cast iron body
Best for: Systems requiring a threaded side outlet with durable iron construction. Better for projects needing compatibility with threaded piping and established Zurn Wilkins components. Caution: Inline compatibility with existing no-hub assemblies may require adapters.
Marathon Economy Aluminum Retrofit Roof Drain
- Brand: Marathon Roofing Products
- Material: Heavy gauge spun aluminum
- Features: Bolt down 4” tall aluminum strainer, 16” diameter flange, 12” outlet length
Best for: Retrofit projects where a lighter weight drain is advantageous. Choose this to reduce roof load while maintaining a robust drainage path. Limitation: Aluminum construction may require different maintenance considerations compared to cast iron.
Buying Guide
What roof drain outlet type do I need?
Side outlet drains are ideal when the drainage path runs parallel to the roof edge or when space above the roof deck is limited. If you already have a hubless or hubbed piping system, match the outlet type (no hub vs hub) to your existing connections.
Which material is best for durability and climate?
Cast iron offers exceptional durability and long life in severe climates, but heavier weight can complicate installation. Aluminum retrofit drains are lighter and easier to handle for retrofit projects, though may require different maintenance considerations. Consider local weather conditions and roof pitch when choosing between metals.
How important is overflow?
Overflow options help prevent ponding and potential roof damage during heavy rain. If you have a flat or low-slope roof with high rainfall, prefer models with an overflow feature or a compatible overflow kit.
What sizing matters most?
Ensure the drain matches your pipe size (commonly 3″ or 4″). No-hub and threaded connections should align with your existing piping. Measure the roof drain flange diameter to ensure a proper seal with your drain basket or strainer.
What installation considerations should I plan for?
Look for included flashing hardware, gravel stops, and dome components. Proper flashing and clamping reduce water leakage at the roof edge. For retrofits, ensure flange diameter and mounting depth fit your roof assembly.
What are common trade-offs?
Cast iron drains provide maximum durability but are heavier and may require more robust lifting. Aluminum drains lighten the load but may require specific sealants or coatings. Balance weight, cost, and compatibility with existing roof systems.
What should I confirm before purchasing?
- Compatible outlet size (3″ vs 4″)
- Hub vs no-hub configuration
- Availability of overflow option
- Diameter of flange and length of outlet for retrofit fit
FAQ
- Q: Do side outlet roof drains fit all roof types? A: They fit most flat and low-slope roofs, but verify flange size and outlet compatibility with your piping.
- Q: Is an overflow essential? A: It helps prevent ponding during heavy rainfall, especially on flat roofs.
- Q: Which material should I choose for a retrofit? A: Aluminum is lighter and easier to handle for retrofits; cast iron is more durable in harsh climates.
- Q: Can I use a side outlet drain with existing hub connections? A: Yes, if your piping matches the outlet style (hub or no-hub), but adapters may be needed for some configurations.
- Q: What maintenance is required? A: Regularly inspect the grille and gravel stop, clear debris, and ensure the flashing remains sealed.