- High-Capacity 116 Sq. In. Free Area: Engineered with a massive 116 square inches of open drainage space, maximizing water intake efficiency to prevent pooling during severe downpours while filtering debris.
- 32-Rib "Old Style" High-Flow Geometry: Features a classic heavy-duty pattern comprising 32 robust ribs and 32 precision-spaced slots, providing balanced multi-directional flow and exceptional load distribution.
- Heavy-Duty Forged Cast Iron: Cast from high-strength commercial-grade iron to deliver exceptional ruggedness and impact resistance against shifting rooftop debris, tools, and extreme elements.
- Signature Green Protective Coating: Finished with a durable, weather-resistant green Duco coating that protects the underlying metal from rust, corrosion, standing water, and typical jobsite grime.
Price: $759.95
Item #316-4116-DOME
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Description
The Josam 4116 Old Style Cast Iron Dome is a cast iron, green-coated replacement dome for compatible Josam roof drains. The design provides a large free area to maintain flow while screening debris. Dimensions and performance values are taken directly from Josam’s official submittal for part 029350.
Key Features
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Cast iron construction with green coating
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Old style dome design with 32 ribs and 32 slots
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Large free area rated at approximately 116 square inches
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Outside diameter approximately 14-1/16 inches
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Height approximately 5-3/8 inches
Specifications
Manufacturer: Josam Company
Model/SKU: 4116 (Josam drawing no. 029350)
Material: Cast iron, coated
Color: Green
Outside diameter: approximately 14-1/16 inches
Height: approximately 5-3/8 inches
Free area: approximately 116 square inches
Rib/slot count: 32 ribs and 32 slots
Quantity: Kits sold individually
Gate: Not included (sold separately)
How To
- Remove the existing dome from the compatible Josam roof drain body and clean the seating surface.
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Position the 4116 dome over the drain opening and align it with the ring or locking points.
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Secure the dome per the drain body’s instructions, ensuring it is fully seated and stable.
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Inspect for gaps and confirm debris cannot bypass the dome.
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Run water to verify proper flow through the dome’s slots and overall drainage performance.
FAQs
Q: What roof drains is the 4116 dome intended to fit?
A: It is an old style Josam cast iron dome used on compatible Josam roof drains in the same series; confirm fit with the drain body’s submittal before ordering.
Q: What are the key dimensions of the 4116 dome?
A: The manufacturer lists an outside diameter of about 14-1/16 inches and a height of about 5-3/8 inches.
Q: How much free drainage area does this dome provide?
A: The Josam submittal indicates approximately 116 square inches of free area.
Q: Does this dome include clamp rings or mounting hardware?
A: No. It is the dome component only; any clamp ring or other hardware is sold separately.
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