Fiberglass Rebar Vs Steel Cost: Which One Saves You More?

When it comes to construction materials, cost-effectiveness is always a top concern. One question often asked by contractors and engineers is: Is fiberglass rebar cheaper than steel? In this article, we break down the true cost of fiberglass (GFRP) rebar vs steel rebar, including not just the purchase price but also installation and long-term performance.

1. Material Cost: GFRP vs Steel

On a per-foot or per-meter basis, GFRP rebar is generally more expensive than traditional carbon steel rebar. However, the price difference has narrowed in recent years as GFRP production becomes more efficient and demand increases.

Note: Stainless steel rebar, often used in corrosive environments, can cost $2.50 – $3.50 per foot, making GFRP a more economical corrosion-resistant alternative.

2. Installation Cost

GFRP rebar is lighter—about 75% lighter than steel—which reduces labor and transportation costs. Crews can handle and install fiberglass rods faster and with less equipment, especially on large job sites.

Moreover, fiberglass bars don’t require cutting and welding equipment, saving on specialized labor. In some cases, this translates to a 10–20% reduction in installation time and labor costs.

3. Maintenance and Lifecycle Cost

This is where fiberglass rebar shines.

• Corrosion resistance: Unlike steel, fiberglass does not rust, making it ideal for coastal, chemical, or humid environments.

• Longer life: GFRP structures require less repair over their service life—especially in water and chloride-exposed applications (e.g., bridges, tunnels, marine structures).

According to research, the total life cycle cost of fiberglass rebar can be 30–40% lower than that of steel in corrosive environments.

4. When GFRP Makes Economic Sense

While the initial cost of fiberglass rebar may be higher, it is more cost-effective in the long term for:

• Marine construction

• Bridges and highway infrastructure

• Chemical plants

• Parking garages

For projects where corrosion is not a concern, steel may remain the more economical option up front.

5. Conclusion

So, is fiberglass rebar cheaper than steel? The answer depends on your project's conditions. For short-term, low-risk applications, steel rebar is cheaper. But for structures requiring corrosion resistance and long-term durability, fiberglass rebar offers better value despite the higher upfront cost.