Drainage Solutions
JWE designs and installs drainage systems for commercial kitchens, wet areas, and F&B renovation projects. Correct channel sizing, gradient to drain, and connection to building waste systems — coordinated with waterproofing and screed within the renovation programme.
Drainage That Fails Silently — Until It Does Not
Commercial drainage failure in a restaurant or food-preparation environment is not a minor inconvenience. A blocked floor drain during a lunch service floods the kitchen. A drain without correct gradient pools water under equipment, creating a hygiene non-compliance that a health inspector will action. A poorly connected waste line backs up into the handwash basin or the prep sink. These failures happen not because drainage is a complex engineering discipline — they happen because drainage in F&B and commercial renovation is routinely treated as an afterthought, installed by whoever is cheapest and fastest rather than whoever understands the performance requirements.
JWE installs drainage as an integrated component of commercial renovation projects, not as an add-on after the main works are done. This means the drainage channel positions and gradients are established before the floor screed is poured, the waterproofing membrane is applied over the correct substrate, and the grease trap connection is sized and positioned before wall finishes make access impossible. The result is a drainage system that functions correctly from the day the premises opens — not one that is rectified at cost after the first month of trading.
Floor Channel & Gradient Works
Kitchen and wet area floors require a minimum fall to drain — typically 1:80 for commercial kitchens. JWE hacks and screeds the floor substrate to establish the correct gradient, positions the drainage channel at the low point, and ensures the fall is consistent across the entire wet zone. Gradient is checked with a spirit level before the waterproofing layer is applied.
Waste Pipe Rerouting
When a commercial renovation changes the kitchen layout, existing waste pipe positions rarely match the new equipment positions. JWE reroutes waste pipework within floor screed and wall chases to connect to new drainage points — maintaining the gradient and access requirements of the building's main waste stack. Rerouting is done before close-up so the final connection is inspectable.
Grease Trap Connection & Sizing
Commercial kitchens are required to pass waste through a grease interceptor before connecting to the building sewage system. JWE sizes and positions grease traps to the drainage load of the kitchen, installs them with access for cleaning, and connects them to the main waste system. For outlets in shopping malls, grease trap specifications are often prescribed by the mall operator — JWE works to those specifications.
Drainage Blockage & Rectification
For existing commercial premises with drainage problems — slow drains, recurring blockages, pooling water on kitchen floors — JWE diagnoses the cause (incorrect gradient, insufficient channel size, blocked waste line, or missing trap) and rectifies it. Where the rectification requires hacking and re-screeding, this is coordinated with the minimum disruption to trading operations.
Common Questions
What is the minimum gradient required for a commercial kitchen floor?
Generally 1:80 (1.25%) for commercial kitchen floors, though this may vary by authority requirement and floor area. The gradient must be consistent — a flat spot between the drain channel and the equipment prevents water from clearing and creates pooling. JWE establishes the gradient before waterproofing, which locks in the fall for the life of the floor.
How long does drainage installation take in an F&B renovation?
For a typical F&B outlet (50-150 sqm kitchen), drainage hacking, rerouting, and initial screed takes 3-5 working days. This must be completed before waterproofing begins, which in turn must cure before tiling. In a well-sequenced programme, drainage is not the critical path — but if it is delayed, it delays everything that follows.
Can drainage works be done while the outlet is still trading?
Not for a full kitchen drainage installation — hacking the existing floor and creating dust and debris is incompatible with a food-handling environment. For mall outlets, works are typically scheduled during dark hours (mall closed) to avoid trading impact. JWE has extensive experience with night-work scheduling for F&B outlets in shopping centres.
F&B Expertise
Drainage That Meets Inspection Standards
JWE drainage installations are designed with health inspection compliance in mind — correct gradients, accessible grease traps, cleanable channel covers, and no pooling zones. For F&B chains with HACCP or food safety certifications, the drainage design is part of the compliance evidence.
Drainage Issue or New Installation?
Whether you have a drainage problem to fix or a new fit-out to commission, contact us with the project details and we will confirm scope and provide a quotation within 3 working days.
Request a QuoteOr call 012-9820888
Drainage Works Scope
- Floor gradient establishment & screed
- Commercial channel & floor drain installation
- Waste pipe rerouting & connection
- Grease trap sizing & installation
- Blockage diagnosis & rectification
- Night-work scheduling for trading outlets