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When comparing fiberglass rebar (GFRP) to steel rebar, cost is often one of the most discussed factors among engineers, contractors, and developers. While steel has been the traditional choice in reinforced concrete structures, GFRP rebar is gaining popularity due to its corrosion resistance and longevity. But is fiberglass rebar really cheaper than steel in the long run? Let’s break it down.
Steel rebar is typically less expensive per linear foot or kilogram compared to fiberglass rebar. Depending on the market:
Steel rebar: $0.40 – $0.70 per lb
GFRP rebar: $0.80 – $1.20 per lb
On the surface, GFRP rebar appears more expensive. However, the price per strength or performance unit tells a different story.
Fiberglass rebar is much lighter—up to 75% lighter than steel. This reduces:
Shipping costs
Labor fatigue
Equipment needs on-site
As a result, installation is faster and less costly in terms of labor hours.
One of the biggest cost-saving factors of fiberglass rebar lies in its resistance to corrosion. In corrosive environments such as marine or chemically exposed areas, steel rebar requires costly protective coatings or ongoing maintenance.
GFRP rebar does not rust, eliminating:
Future repair costs
Premature structure failure
Downtime or disruptions
When accounting for a full 30–50 year structure lifespan, fiberglass rebar often turns out to be 25–40% more cost-effective than steel rebar.
This includes:
No corrosion-related repairs
Lower maintenance
Higher design life
| Factor | Steel Rebar | Fiberglass Rebar (GFRP) |
Initial Price (per lb) | $0.50–$0.70 | $0.90–$1.20 |
Weight | High | Low |
Corrosion Resistance | Low | Excellent |
Long-Term Maintenance | High | Minimal |
Life Cycle Cost (Est.) | 100% | ~70–80% |
While GFRP rebar may have a higher upfront cost, its lower maintenance, ease of installation, and corrosion resistance make it the more economical choice for long-term projects—especially in aggressive environments like coastal regions, wastewater plants, or bridges.
For contractors focused on lifecycle savings and structural longevity, fiberglass rebar is a smart investment.
