Galvanized vs. Fiberglass Rebar: We Weigh the Pros and Cons
In this article:
You can’t afford to underestimate the importance of quality rebar. In so many cases, your success hinges on using the right materials for rebar. It’s crucial because it provides strength to concrete, and it’s vital that the rebar lasts for decades, even in harsh environments.
But what about galvanized vs. fiberglass rebar?
Each option carries distinct advantages and disadvantages; however, when examined closely, you’ll see that galvanized rebar provides some powerful benefits, including the convenience of being able to bend on site.
We understand that there can be no compromises when it comes to the structural integrity of your project. At South Atlantic, we have you covered with dependable rebar that meets or exceeds ASTM standards, so there will be no worries about flaking or cracking. Want to learn more about our reliable, on-time delivery? Please contact us for a quote.
In this article, we’ll take a closer look at galvanized vs. fiberglass rebar, their comparative costs and their main advantages and disadvantages.
What Are the Pros/Cons of Fiberglass Rebar?
There are some positive aspects of fiberglass rebar, but when you take a closer look, you’ll find that it also has several disadvantages.
Pros/Cons of Fiberglass Rebar
|
Pros |
Cons |
|
Corrosion-proof |
Is very brittle when compared to steel |
|
Lightweight |
Can’t be bent on site |
|
Long service life |
Is more expensive |
|
Reduced transportation and labor costs |
Requires special tools |
What Are the Pros/Cons of Galvanized Rebar?
If you take a closer look, you’ll discover that the benefits of galvanized rebar can easily outweigh any disadvantages.
The Pros/Cons of Galvanized Rebar
|
Pros |
Cons |
|
Extremely corrosion resistant |
Heavier than fiberglass |
|
Compatible with construction codes |
If paired with incompatible materials, it increases the corrosion risk |
|
Can be shaped and cut on-site |
Can present safety hazards if welding is needed. A706 Weldable rebar should be used if welding is needed and proper precaution should be used. |
|
Zinc coating provides protection, even if scratched |
Higher initial cost (but more economical over the long term due to lower maintenance and longevity) |
Can Fiberglass Rebar Easily Bent on a Work Site?
No, it cannot. It’s rigid, and as a result, may crack or even snap when forced to bend. This is why it’s important to do extensive pre-construction planning.
Not all galvanized rebar should be bent after galvanizing.
- Class 1 / Type 1 coatings are specific to galvanizing after fabrication and can occasionally be bent after galvanizing, but some cracking or flaking is expected due to the thickness of the galvanized coating. It can be repaired in accordance with A780 but is not cause for rejection.
- Class 2 / Type 2 coatings are designed to be fabricated after galvanizing without cracking or flaking of the coating
Following these guidelines will help ensure that the zinc coating is not compromised.
Which Is a More Cost-Effective Rebar Option?
Fiberglass will generally have a higher upfront cost. It may have a lower labor cost because it is lighter and as a result, easier to transport. But that advantage dissolves when you consider that its pre-fabrication needs will add planning expense to your project (and as we mentioned earlier, fiberglass cannot be bent at the work site).
Galvanized rebar can last upwards of 70 years, and in many cases, outlive the structure itself.
You Don’t Have to Compromise Strength for Flexibility; South Atlantic Has You Covered
You won’t have to worry about getting your materials when you need them. With on-time delivery to all 50 states, we position you for success. Our rebar won’t flake or crack, so you can depend upon our reliability.
We invite you to contact us for a quote and discover why national brands have trusted us for more than 50 years.
Key Takeaways
- Rebar quality is critical because it provides structural strength to concrete and must endure harsh environments for decades.
- Fiberglass rebar is corrosion-proof and lightweight, but is brittle, cannot be bent on-site, and requires special tools.
- Galvanized rebar is extremely corrosion-resistant, compatible with construction codes, and can be bent directly on the job site.
- Fiberglass rebar cannot be bent on-site without risking cracking or snapping, making extensive pre-construction planning essential.
- While fiberglass may have lower labor costs due to its lighter weight, its pre-fabrication requirements add planning expenses that offset this advantage.
- Galvanized rebar can last upwards of 70 years, often outliving the structure itself, making it more cost-effective over the long term despite a higher initial cost.
- Even if the zinc coating on galvanized rebar is scratched, it still continues to provide corrosion protection.
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Sources:
American Galvanizers Association, “Testing Galvanized Rebar,” https://galvanizeit.org/reinforcing-steel-online-seminar/design-and-specification/testing-galvanized-rebar

