Fibergrate Composite Structures Blog - UK

The Benefits of GRP Trench Drain Covers

Written by Fibergrate Marketing UK | 14-Apr-2025 10:00:00

Trench drain covers are an important component in a wide range of industries, playing a role in managing water drainage, protecting cables and utilities, and ensuring pedestrian and vehicle safety. However, traditional trench drain covers made from materials like steel and cast iron can present significant challenges. These challenges can include:

  • Corrosion: Exposed to water, chemicals, and harsh weather conditions, traditional metal covers are susceptible to rust and corrosion. This can lead to structural weakening, safety hazards, and the need for frequent replacements.
  • Heavy Weight: Steel and cast iron are heavy materials, making transportation, installation, and handling of trench drain covers a laborious and potentially costly task.
  • High Maintenance: Metal covers often require regular cleaning, painting, or repairs to maintain their structural integrity and appearance.

GRP Trench Drain Covers: A Durable and Versatile Alternative

Glass Reinforced Plastic (GRP) trench drain covers offer a compelling alternative to traditional materials. GRP is a composite material that combines the strength and rigidity of fibreglass fibres with a durable resin matrix. This results in a lightweight yet incredibly strong and durable material that provides a wide range of benefits for trench drain applications.

Corrosion Resistance of GRP vs Traditional Materials

One of the most significant advantages of GRP trench drain covers is their exceptional resistance to corrosion. Unlike steel and cast iron, GRP is not susceptible to rust from exposure to water, salts, chemicals, and other corrosive elements. This translates to long-term durability, minimising the risk of structural failures and ensuring the longevity of your trench drain system.

For instance, in applications like car washes, wastewater treatment facilities, or coastal environments, traditional metal covers corrode rapidly due to constant moisture and potential salt exposure. GRP trench drain covers, on the other hand, maintain their structural integrity and appearance in these challenging environments, significantly reducing the need for replacements and associated costs.

GRP Trench Drain Covers are Lightweight & Easy to Install

Another key benefit of GRP trench drain covers is their lightweight design. Compared to their heavy metal counterparts, GRP covers are significantly lighter, simplifying transportation, installation, and handling. This translates to:

  • Reduced Labour Costs: Lighter weight makes it easier for crews to manoeuvre and install trench drain covers, potentially saving time and labour costs. Steel is four times denser than GRP, and steel gratings can be two to two-and-a-half times heavier than GRP gratings. This is especially important in use cases where installations are temporary or are frequently moved, such as such as construction sites, industrial facilities, and temporary event spaces.
  • Improved Efficiency: Faster installation means less downtime for construction or maintenance projects.  
  • Versatility: The lighter weight makes GRP trench drain covers suitable for a wider range of applications, including areas with weight restrictions or limited access. 

In-House Expertise at Fibergrate

At Fibergrate, we understand the importance of a smooth and efficient installation process. That is why we offer a range of GRP trench drain cover materials in various sizes and load capacities, allowing for precise project specifications. This includes covered grating, and moulded and pultruded grating. Additionally, Fibergrate's team of expert in-house engineers can provide valuable assistance with custom design and certification drawings, ensuring your trench drain system meets all necessary requirements.

GRP Trench Drain Covers Offer High Strength to Weight Ratio

Despite their lightweight design, GRP trench drain covers possess exceptional strength and load-bearing capacity. The advanced composite structure of GRP can be engineered to handle a wide range of weight requirements, making them suitable for various applications. These include:

  • Installation in Pedestrian Traffic Areas: GRP trench drain covers can safely accommodate foot traffic in areas like sidewalks, walkways, or plazas.
  • Installation in Vehicular Traffic Areas: High-strength GRP covers can be designed to support vehicular loads in areas like parking lots, driveways, or industrial facilities. This strength is achieved while being less than half the weight of steel.
  • Heavy Equipment Access: For facilities requiring access to heavy machinery, Fibergrate offers GRP trench drain covers specifically designed to handle significant loads. For more on GRP’s suitability for handling heavy loads, read Fibergrate’s case study on installation of Utility Trench Covers for a  Water Treatment Plant in Dallas.

 

GRP grating is also highly impact-resistant, check out our drop test to get an idea of how GRP's impact resistance stacks up against steel's.

By choosing GRP trench drain covers, you ensure the system can withstand the anticipated loads without compromising safety or functionality.

Safety First: Slip-Resistant GRP Composite Trench Drain Covers

 

Traditional metal trench drain covers, when wet or contaminated, can become slippery and pose a significant safety hazard, increasing the risk of accidents and injuries.

GRP trench grate covers offer a superior solution by incorporating slip-resistant surfaces. These textured surfaces provide excellent traction even in challenging conditions, such as wet environments, oil spills, or debris accumulation. This significantly reduces the risk of slips and falls, protecting workers and visitors.

Key Safety Benefits of GRP Trench Grate Covers:

  • Enhanced Traction: Slip-resistant surfaces provide superior grip, even in wet or contaminated conditions.
  • Reduced Fall Risk: Minimise the likelihood of accidents and injuries caused by slips and falls.
  • Improved Safety for Pedestrians: Protect workers, visitors, and the general public from safety hazards.
  • Compliance with Regulations: GRP trench grate covers with slip-resistant surfaces can help meet safety regulations and industry standards.

Long Lifespan of Trench Drains: Plastic Composites Outshine Other Materials

Traditional metal trench drain covers often require regular maintenance, including cleaning, painting, or repairs to maintain their integrity and aesthetics. In contrast, GRP trench drain covers are very low on maintenance. Their non-corrosive properties minimise cleaning needs, and their durable construction eliminates the need for frequent repainting. This translates to significant cost savings over the lifespan of the trench drain system.

For example, in a commercial kitchen or food processing facility, frequent cleaning and sanitation processes pose challenges for maintaining traditional metal trench drain covers.

Trench Drain Covers by Fibergrate

By choosing GRP trench drain covers, you can significantly enhance the safety, durability, and efficiency of your infrastructure. GRP offers a compelling alternative to traditional materials, providing a lightweight, corrosion-resistant, and long-lasting solution.

Fibergrate is a leading manufacturer of GRP products for indoor and outdoor applications, offering a wide range of products to meet your specific needs. Our in-house engineering team can provide expert guidance and support to help with designing GRP solutions for custom drainage projects.

Contact Fibergrate today to learn more about how our products can benefit your project.