Concrete vs. Fiberglass Reinforced Plastic: Which Material is Lighter?

Concrete vs. Fiberglass Reinforced Plastic: Which Material is Lighter?

Are you trying to decide between using concrete or fiberglass reinforced plastic for your project? Both materials have their own unique benefits and drawbacks, but one key factor to consider is weight. In this article, we will explore the differences in weight between concrete and fiberglass reinforced plastic to help you make an informed decision for your next construction or design project.

Weight Comparison of Concrete and Fiberglass Reinforced Plastic

When comparing the weight of concrete and fiberglass reinforced plastic (FRP), it is important to consider the factors that affect the weight of each material.

Factors affecting the weight of concrete

  1. Density: Concrete is a dense material, typically weighing around 150 pounds per cubic foot. The density of concrete can vary depending on the mix design and the aggregates used.

  2. Reinforcement: Concrete is often reinforced with materials such as steel rebar to increase its strength. While this reinforcement improves the structural integrity of concrete, it also adds to its overall weight.

  3. Thickness: The thickness of concrete structures can also impact their weight. Thicker concrete walls or slabs will be heavier than thinner ones.

Factors affecting the weight of fiberglass reinforced plastic

  1. Resin content: The weight of FRP is largely determined by the amount of resin used in the composite material. Higher resin content will result in a heavier FRP product.

  2. Fiber type and orientation: The type and orientation of the fibers used in FRP can also impact its weight. For example, carbon fibers are lighter than glass fibers, so a carbon fiber reinforced plastic product will be lighter than one reinforced with glass fibers.

  3. Thickness: Similar to concrete, the thickness of FRP structures will affect their weight. Thicker FRP panels or components will be heavier than thinner ones.

In general, fiberglass reinforced plastic is lighter than concrete due to its lower density and the ability to tailor the material composition for specific weight requirements. However, both materials have their own strengths and weaknesses that should be considered when choosing between them for a particular application.

Advantages of Lightness in Construction Materials

Ease of transportation and installation

Lightweight construction materials such as fiberglass reinforced plastic are easier to transport compared to heavier materials like concrete. This can result in cost savings for transportation and make the installation process quicker and more efficient.

Reduced structural load on foundations

Using lighter materials in construction can help reduce the overall structural load on foundations. This can lead to a longer lifespan for the building and lower maintenance costs in the long run. Additionally, lighter materials may require less extensive foundation work, saving time and money during the construction process.

Impact on overall project cost

Choosing lighter construction materials can have a significant impact on the overall project cost. Lighter materials are often cheaper to transport and easier to work with, resulting in lower labor and installation costs. Additionally, the reduced structural load on foundations can lead to cost savings in terms of foundation design and construction. Overall, opting for lighter materials like fiberglass reinforced plastic can help keep project costs down and improve the efficiency of the construction process.

Applications of Lightweight Materials in Various Industries

Construction industry

In the construction industry, the use of lightweight materials such as fiberglass reinforced plastic (FRP) has gained popularity due to its ease of handling and installation. FRP is lighter than traditional materials like concrete, making it ideal for applications where weight is a concern, such as in building facades, structural components, and even bridges. The lightweight nature of FRP also reduces the overall load on a structure, leading to cost savings and increased durability.

Aerospace industry

The aerospace industry is another sector that heavily relies on lightweight materials for its applications. Materials like carbon fiber composites are used in aircraft construction due to their high strength-to-weight ratio. These lightweight materials help reduce the overall weight of the aircraft, leading to improved fuel efficiency and performance. Additionally, the use of lightweight materials in aerospace applications allows for greater payload capacity and longer flight ranges.

Automotive industry

In the automotive industry, the use of lightweight materials has become increasingly important as manufacturers strive to improve fuel efficiency and reduce emissions. Materials like aluminum, carbon fiber, and FRP are being used in the construction of vehicles to reduce weight without compromising on strength and safety. Lightweight materials not only make vehicles more fuel-efficient but also improve handling and performance. As the demand for electric vehicles continues to grow, the use of lightweight materials will play a crucial role in extending battery range and overall vehicle efficiency.


In conclusion, both concrete and fiberglass reinforced plastic have their own unique advantages and disadvantages when it comes to weight. While fiberglass reinforced plastic is generally lighter than concrete, the choice between the two materials ultimately depends on the specific needs of the project. Factors such as durability, cost, and ease of installation should also be taken into consideration when selecting the most suitable material for a particular application. By weighing these factors carefully, project managers and engineers can make an informed decision on whether to use concrete or fiberglass reinforced plastic for their next construction project.