GRP Trench Covers
Durable, Non-Corrosive Covering Solutions for Trenches, Ducts, and Channels
Sui Generis GRP Trench Covers offer a strong, lightweight, and corrosion-resistant solution for safely covering open trenches, ducts, channels, and utility voids. Manufactured from Glass Reinforced Polymer (GRP) composite, these trench covers are engineered for use in a variety of commercial, industrial, and infrastructure environments.
Whether you’re managing a construction site, utility upgrade, or ongoing facility maintenance, our trench cover systems provide a reliable, long-lasting alternative to steel, timber, or concrete. Designed for both pedestrian and light vehicular traffic, Sui Generis GRP covers are ideal for use both indoors and outdoors.
Why Choose GRP Composite for Trench Cover Applications?
Glass Reinforced Polymer (GRP) is a composite material made from a polymer resin reinforced with glass fibres. It offers significant advantages over traditional materials thanks to its high strength-to-weight ratio, corrosion resistance, and long-term durability.
Unlike steel, GRP composite does not rust, conduct electricity, or degrade when exposed to water, oils, or chemicals. It also requires no protective coatings or galvanisation. Our trench covers are finished with an aggressive anti-slip gritted surface that delivers excellent slip resistance, even in wet or oily conditions, helping to improve safety on site.
Key features include:
- Lightweight and easy to handle, reducing the need for lifting equipment
- Non-metallic and electrically non-conductive, ideal for power, water, and telecoms applications
- Chemical, impact and UV-resistant, suitable for tough environments
- Zero maintenance required, with long-term performance built in
- Fire-retardant options available to meet regulatory standards
We also offer sustainable FRP composite trench covers, made using low-impact resins and recycled materials, providing an environmentally conscious alternative without compromising on performance.
Typical Applications for GRP Trench Covers
Sui Generis GRP trench covers are used across multiple sectors and industries, including:
- Utilities: water, gas, electricity, and telecoms
- Chemical and processing plants
- Construction and civil engineering projects
- Manufacturing and industrial sites
- Transport hubs and depots
- Energy generation and renewables
- Food and beverage production
- Waste management facilities
Applications include the covering of drainage trenches, service ducts, inspection chambers, cable troughs, gullies, bund channels, and plant room voids.
Easy to Install, Safer to Handle
Compared to traditional trench covers made from steel or concrete, GRP composite panels are significantly lighter – often less than 25% of the weight of steel. This makes manual handling safer, and reduces the need for cranes or lifting equipment.
Trench covers can be installed onto concrete rebates, steel frames, or fixed using GRP angle brackets and clips. Optional hinged and lockable panels are available where regular access or security is required.
Cutting and adjusting panels is quick and easy with standard power tools, with no need for hot works. This makes on-site modifications simple, especially on fast-moving construction or refurbishment projects.
Design & Manufacturing Service
Sui Generis offers a full in-house design, fabrication, and installation service. From your initial enquiry through to delivery or on-site fitting, we ensure your trench cover system meets your specifications and performance needs.
Our team will assist with technical drawings, load assessments, and fixing details. Panels can be supplied pre-cut and labelled for fast installation, or fully installed by our experienced site operatives.
We also provide custom options such as:
- Colour-coded panels for utility type or zoning
- Anti-slip coatings in high-visibility finishes
- Load rating customisation
- Sustainable composite material selection
GRP Trench Cover Options
Our composite trench covers are available in a wide range of sizes, thicknesses, and surface finishes to suit both standard and bespoke applications. All panels can be joined using GRP or stainless-steel clips, and cut to fit on-site where needed.
Standard Mesh Panels
- Panel sizes: 1985 x 996mm, 3010 x 996mm or 3660 x 1220mm
- Thickness: 25mm, 38mm, or 50mm
- Colours: Green (RAL 6029), Grey (RAL 7035), Yellow (RAL 1003)
Solid Top Panels
- Designed for sealed surface applications
- Available in pedestrian or light vehicle load ratings
- Gritted anti-slip surface as standard
Built for Compliance and Safety
Our GRP trench covers are engineered to meet relevant health and safety standards, with strong load performance, high slip resistance, and options to suit confined spaces or electrically sensitive zones. As a trusted provider to industry and construction, Sui Generis is committed to safe design and safe working.
Our installation teams are fully trained and certified, holding qualifications including:
- CSCS, SSSTS, and CITB H&S Awareness
- Confined Space and Emergency First Aid
- PASMA, IPAF, and Working at Height
- Asbestos Awareness and EUSR Hygiene
We maintain a proactive, safety-first approach across all site services and projects.
Key Benefits of GRP Trench Covers from Sui Generis
- Manufactured from durable GRP composite
- Excellent slip resistance in wet and oily conditions
- Non-corrosive, chemical and UV resistant
- Electrically non-conductive and fire retardant options available
- Lightweight for easy manual handling and installation
- Zero maintenance – long lifespan with no rust, rot, or peeling
- Sustainable composite options available
- Custom sizes and finishes to suit your site
- Made in the UK to your specifications