Wash bays demand concrete that slopes in every direction, drains to trench systems, and connects to oil-water separators before water leaves the property. We engineer the slab for the weight of your equipment, set the slope so water never pools, and integrate the separator system to meet storm-water rules. Free written estimate on every project.
Wash water from heavy equipment contains hydrocarbons, sediment, and detergents that cannot enter the storm system. Local regulations require that all wash water pass through an oil-water separator before discharge. The concrete slab has to be engineered to move wash water efficiently to the separator without pooling or bypassing the system.
We size the slab thickness for the heaviest equipment you run, slope the entire bay surface toward trench drains positioned for maximum capture, connect the drain system to the oil-water separator, and apply chemical-resistant finishes if your wash cycle includes degreasers or alkaline detergents. The result is a bay that handles daily operations and passes environmental inspection.
We measure the bay footprint, identify the heaviest equipment that will use it, determine the oil-water separator capacity needed, and engineer 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 concrete forms are set.
Form, reinforce, and pour
Forms are positioned with the engineered slope in every direction toward the trench drains, rebar is placed for equipment loads, and the concrete is poured and finished with a broom texture for foot grip during wash operations.
Test drainage and hand off
Trench drain grates are installed, the oil-water separator is connected to the discharge line, the system is tested with water to confirm slopes carry water to drains, and the bay is ready for operation.
The critical detail
Why Slope Cannot Be Fixed After Cure
A wash bay without proper slope is just a concrete pad that collects water. Every part of the bay surface must slope toward a trench drain, and the slope must be consistent so water flows continuously without pooling in corners or low spots. We verify slope during the pour using a level and water flow tests, not after the concrete cures. If slope is wrong, the only fix is tear-out and replacement.
Coordinate with your concrete supplier on timing and with environmental compliance on separator sizing and discharge routing. The wash bay is one piece of your larger industrial concrete footprint. Call us to discuss your fleet's specific wash chemistry and equipment weight.
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.
Client reviews
What Abbotsford Operations Say About Their Wash Bays
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, Abbotsford
★★★★★
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, Chilliwack
★★★★★
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, Mission
★★★★★
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, Langley
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