Floor Sinks

A floor sink is a raised basin fixture with defined walls and a visible bowl, designed to receive direct discharge from mops, equipment, or indirect waste lines. Floor drains are flush-mounted grates set directly into the floor surface for general area drainage. Floor sinks provide an air gap that prevents contamination through backflow, making them required by plumbing codes for indirect waste connections. They also offer easier cleaning access and comply with food service sanitation standards, unlike standard floor drains.

Floor sink sizing depends on your cleaning equipment and water volume. Standard mop buckets work with 20x16-inch or 20x20-inch bowls. Larger facilities using industrial mop systems benefit from 24x24-inch or 28x20-inch models. Bowl depth matters too: 8-inch depths suit routine mopping, while 12-inch deep basins handle heavy-duty operations and prevent splashing. Consider your space constraints, drain location, and frequency of use when selecting dimensions.

Most commercial plumbing codes require floor sinks for indirect waste connections where there's potential for contamination. This includes discharge from food preparation equipment, mop sinks, condensate drains, and certain HVAC systems. The raised basin provides an air gap that prevents backflow into potable water systems. Requirements vary by jurisdiction and application, so consult your local plumbing inspector or building department for specific code compliance needs in your facility.

16-gauge stainless steel is the industry standard for commercial floor sinks, offering excellent durability and corrosion resistance for high-traffic facilities. This thickness withstands repeated impacts from mop buckets, cleaning equipment, and heavy use without denting or degrading. Thinner gauges may reduce upfront costs but compromise longevity. For institutional and food service applications requiring NSF compliance and multi-decade service life, 16-gauge construction is the recommended specification.

Regular maintenance extends floor sink lifespan and prevents odors. Rinse the basin daily after use and clean weekly with mild detergent and warm water. Avoid abrasive cleaners that scratch stainless steel. Check the drain basket regularly, removing debris to maintain proper flow. Quarterly, flush the trap with enzymatic drain cleaner to prevent buildup. Inspect the free-flow drain and splash guard for damage. Stainless steel naturally resists corrosion, but prompt cleaning of spills prevents staining and maintains sanitary conditions.

Floor sink installation requires plumbing expertise and typically needs licensed professional installation. The process involves concrete cutting, drain pipe connection, proper trap installation, and ensuring code-compliant air gaps. Improper installation can cause leaks, drainage issues, or code violations. While technical documentation (DWG files, specifications) is available for planning, hire a licensed plumber familiar with commercial fixture installation and local plumbing codes to ensure proper, warrantied installation that passes inspection.