Restaurant & Commercial Kitchen Drainage

The problem: kitchens are washed, not mopped

A commercial kitchen floor is designed to be hosed down every night. If the water has nowhere to go, it pools behind the line, under the dish machine, and at the walk-in door — and standing water in a food-service space is exactly what a health inspector is walking in to find. Add grease film on quarry tile and you have the slip-and-fall zone every operator dreads.

A trench drain run along the cookline or across the dish pit collects wash water continuously instead of forcing it toward a single point drain. Just as important as capacity is cleanability: grates have to lift out for the nightly scrub, channel surfaces need to rinse smooth without trapping food solids, and anything that corrodes has no business in a kitchen. That's why stainless steel edging and grates are the default answer in food service.

One scope note: interior floor sinks and point drains under equipment are plumbing fixtures set by your plumber to the local code. Trench systems complement them — they capture the wash-down water those points can't reach. And wherever kitchen drainage carries grease-laden water, it must route through a grease interceptor per your local plumbing code; plan that connection before the slab is cut.

Why stainless is the food-service default

Stainless steel earns its place in kitchens for three reasons: it doesn't corrode under salt, sanitizer, and acidic food waste; its smooth surface releases grease and solids in the nightly wash instead of holding them; and it presents well at inspection. Galvanized and painted steel lose all three arguments within a couple of years of daily washdown. Where budget pushes back, a polymer concrete channel with stainless edge rails and stainless grates gives you the cleanable contact surfaces without pricing the entire run in solid stainless.

Load class: light inside, heavier out back

Inside the kitchen, traffic is people, carts, and pallet jacks — the lower load classes handle it, and a heavy vehicular grate would just be money wasted. At the loading area and dumpster pad, box trucks and the grease-recycling truck change the math. Use our Load Class Recommendation Guide to match each zone: Class A–B inside, Class C (H-20) where trucks roll.

Recommended systems

Josam stainless steel trench systems — including the Lite Line and Pro Plus series — are also available on request; mention them when you request a quote and we'll spec and price the line alongside the ACO options.

Planning resources

• Load Class Recommendation Guide — the class-by-class reference for each zone.
• Channel Drain Resources — installation and selection guides.

Prefer to talk it through? Call 803-324-3225, email [email protected], or use the contact form.