Wash Bays Built for Heavy Equipment Fleets in Detroit
Wheel loaders, dump trucks, and excavators need a place to get clean without contaminating the storm system. We pour wash bay slabs engineered for the weight and traffic, sloped to capture every drop of wash water into trench drains that feed an oil-water separator before discharge. Detroit Concrete handles the full scope: slab design, drainage routing, separator integration, and chemical-resistant finishes for harsh detergents.
A wash bay is not just a concrete pad. It is a contained system where hydrocarbons, sediment, and cleaning agents concentrate into a single stream that must be processed before it leaves the property. Local storm-water regulations mandate that wash water pass through an oil-water separator; the concrete slab has to be engineered to deliver water to that separator reliably, without pooling or bypassing.
We size the slab thickness for the heaviest equipment that will operate in the bay, establish slope in all directions toward strategically positioned trench drains, integrate the separator into the drain system, and apply chemical-resistant surface treatments if your wash cycle includes degreasers or alkaline detergents. The result is a bay that handles daily traffic and harsh chemistry without surface breakdown.
We measure the bay footprint, identify the heaviest equipment that will use it, confirm the discharge location for the separator, and design the slab thickness, slope geometry, and drain routing as one integrated system.
Excavate and prepare subgrade
The bay area is excavated to the engineered depth, subgrade is compacted to specification, gravel base is placed and leveled, and trench drain lines are routed before any forms are set.
Form, reinforce, and pour
Forms are positioned with the engineered slope built in, rebar is placed for equipment loads, and the concrete is poured and finished with a broom texture for foot grip during wash operations.
Verify slope and install separator
We test slope with water during and after cure to confirm drainage to trench drains, install drain grates, connect the oil-water separator to the discharge line, and run a full system test before handoff.
The critical detail
Slope Determines Whether Your Wash Bay Drains
A wash bay without proper slope is a concrete pad that holds water. Every inch of the slab must slope toward a trench drain, and that slope must be consistent so water does not collect in corners or low spots. We verify slope during the pour using a level and water flow tests, then again after the concrete cures. If slope is wrong, it cannot be fixed after cure without tearing out the slab.
Coordinate the wash bay with the rest of your site infrastructure, including fuel station concrete if you have one, and confirm discharge routing with your environmental compliance team. The bay is one piece of a larger containment strategy across our industrial concrete portfolio.
Trench drains, oil-water separators, slope verification and storm-water compliance.
Storm-water regulations require hydrocarbons to be removed before wash water enters the storm system. Oil-water separators are the engineered solution; without them, the wash bay's discharge violates discharge limits and can trigger fines or shutdowns.
During the pour with a level and a water flow test, then again after cure. Every direction across the bay must carry water to a trench drain; pooling anywhere means the slope is wrong and needs correction before the slab cures.
Sometimes, if it can be sloped (often it cannot), drained (usually needs new trenches cut), and routed to a separator (almost always new work). The economics often favor a purpose-built bay; we will assess case-by-case.
Yes if degreasers or harsh detergents are part of the wash cycle. Standard concrete surface degrades under repeated alkaline or solvent exposure; chemical-resistant treatment extends slab life dramatically.
Several weeks from excavation through cure and separator install. The full schedule is in the quote, including time for the environmental discharge connection if regulatory review is required.
New wash bay with proper slope to trench drains and the oil-water separator we needed for compliance. Discharge passes regulatory inspection, equipment gets washed faster, no more puddles in corners.
Z. K5
Fleet Manager, Detroit
★★★★★
They engineered for our wheel loaders and dump trucks, the heaviest stuff we run. Slab has held under daily traffic, drainage works through every wash. Right tool for the actual fleet.
Y. K5
Operations Director, Warren
★★★★★
Wash bay with chemical-resistant surface for the degreaser we use. Three years of operation, no surface degradation, separator processes hydrocarbon properly. Compliance side covered.
Q. K5
Mining Operations, Ann Arbor
★★★★★
They tested the slope with water before signing off. Pooled in one corner; they corrected it before cure. Final result drains perfectly. Real install discipline.
X. K5
Construction Yard Manager, Sterling Heights
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Describe your equipment fleet, wash chemistry, and site discharge location. We will engineer the slab and send a written quote within one business day.
