Fiberglass Pit Covers

Fiberglass pit covers provide a combination of strength and corrosion resistance. Our fiberglass pit covers come in several different sizes and widths for public and residential use. Their slip-resistant surface and non-conductivity are among the many features of fiberglass pit covers, thus making this product the perfect choice for a wide range of applications. Additional sizes may be available upon request.

Fiberglass Pit Covers 1 Inch

Available in Gray or Green

Fiberglass Pit Covers 1.5 Inch

Available in Gray or Green

The Advantages of Fiberglass Pit Covers


Structural Durability

Fiberglass pit covers boast exceptional structural durability due to the combination of high-tensile strength glass fibers and a resilient resin matrix. This composite material is designed to withstand significant loads and utilizes the mechanical properties of glass fibers — including their high strength-to-weight ratio — to distribute weight and stress evenly across the cover’s surface. 


Additionally, unlike traditional construction materials, fiberglass does not succumb to fatigue under load. As such, its ability to maintain its dimensional stability and mechanical integrity over time makes fiberglass well-suited for pit covers.

Resistance to Vibration

The inherent design of fiberglass pit covers grants them a high resistance to vibration. The combination of glass fibers, randomly arranged or woven into fabrics embedded within a polymer matrix, creates a material with excellent damping properties. This trait allows a pit cover made of fiberglass to effectively absorb and dissipate vibrational energy, preventing the transmission of vibrations and ensuring the stability of the cover under dynamic loads.

Resistance to Corrosion

Fiberglass is an ideal choice for pit covers exposed to corrosive chemicals or harsh environmental conditions. The glass fiber-reinforced plastic is chemically inert, meaning it does not react with most chemicals, and the resin matrix offers an additional barrier against corrosive substances. This resistance is further enhanced by the addition of specific raw materials, such as calcium oxide, into the resin, which can neutralize acidic compounds. 


Such chemical resistance makes fiberglass covers suitable for use in pond, garden, and pool areas where exposure to moisture is common. Unlike metals that corrode or degrade over time when exposed to such environments, fiberglass maintains its structural and aesthetic qualities. This corrosion resistance ultimately reduces the need for frequent replacements, allowing a fiberglass pit cover to last for years.

Resistance to Heat

Fiberglass pit covers excel in resisting heat and high temperatures due to their composition as a thermal insulation material. The glass fibers themselves possess low thermal conductivity, making the composite material an effective insulator. In addition, the resin matrix can be formulated to withstand elevated temperatures. This trait prevents the degradation of the cover under continuous exposure to heat.


As such, this thermal resistance is particularly beneficial for resisting extreme temperatures. The ability of fiberglass to maintain its mechanical properties and dimensional stability at high temperatures surpasses that of many other materials, making it a preferred choice for creating safe and durable pit covers.

Low Maintenance

The low maintenance of fiberglass pit covers stems from their durable nature and resistance to environmental factors. Fiberglass’s resistance to corrosion, heat, and vibration negates the need for regular repairs or replacements, while its non-porous surface prevents the accumulation of dirt and debris, making cleaning straightforward.


Unlike covers made from materials susceptible to rust, decay, or fading, fiberglass remains aesthetically pleasing and functionally intact with little upkeep. In addition, the initial manufacturing process minimizes the need for custom adjustments or modifications post-installation.

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If You’re Interested in Fiberglass Pit Covers, Call Us Today

For a pit cover that resists thermal expansion and is a good electrical insulator, you can never go wrong with fiberglass. No matter what type of location or setting you need them for, a fiberglass pit cover can be relied on for years to come.

Call The Trench Grate Store today for further information on our fiberglass pit covers and to place an order.