Fiberglass (GFRP) rebar usually costs more per metre than plain steel rebar of a similar size, but the material price is only part of the comparison. GFRP is sold by length rather than weight, it is far lighter to handle, it can't rust, and it competes most strongly against corrosion-protected steel in structures exposed to road salt or seawater. Whether it is the cheaper choice depends on the structure, the exposure and how long it needs to last.
This guide explains how GFRP is priced, what moves the price, and how to compare it with steel without getting misled by a per-foot number.
How GFRP rebar is priced
Steel rebar is bought by the tonne. GFRP is different:
- Straight bar is usually quoted by length, per metre or per foot, for each bar diameter. Manufacturer literature puts GFRP at roughly a quarter of the weight of steel bar, so a per-tonne price would hide how much bar you are actually getting.
- Bent shapes are usually quoted by the piece. GFRP is made with a thermoset resin that cures permanently, so bends are formed at the factory during production. Manufacturer guidance is that standard bent shapes can't be bent in the field, which makes stirrups, hooks and corner bars a separate product with their own pricing.
- Freight is lighter but still real. Lower weight helps on shipping and handling, but long straight lengths still need a truck that can carry them.
When you see "fiberglass rebar price per foot" online, it is almost always for straight bar of one diameter, often from the US retail market. It says little about the cost of a Canadian job that needs a mix of sizes and bent shapes and has to meet CSA requirements.
What drives the price of GFRP rebar
Bar diameter. Larger bars use more glass fibre and resin per metre and cost more per metre.
Grade and modulus. CSA S807 classifies GFRP bars by grade based on stiffness (modulus of elasticity). Higher-modulus bars are a different product and can price differently. Ontario's provincial specification for GFRP in transportation work, OPSS.PROV 1640, calls for Grade III bars with D1 durability under CSA S807. Building projects follow the engineer's specification.
Straight vs bent. Bent bars are made to order in specific shapes and cost more per unit of reinforcement than straight bar. A design that leans heavily on stirrups and hooks costs more to supply in GFRP than one that is mostly straight bar.
Qualification and paperwork. Bars that must meet CSA S807, come from a manufacturer on the MTO Designated Sources for Materials list, or arrive with lot-by-lot quality control reports carry the cost of that testing and documentation. Our post on fiberglass rebar and the CSA S807 and S806 standards explains what those standards cover.
Quantity and production runs. GFRP is manufactured in production lots. Larger orders, and orders that fit a manufacturer's existing runs, price better than small one-off quantities of unusual sizes or shapes.
Lead time. Bent shapes and less common diameters may need to be produced for your order. A tight schedule can limit options.
GFRP vs steel: comparing the right things
A fair comparison looks at the whole job, not the price per metre.
Against plain black steel
Per metre, plain uncoated steel is typically the lowest-cost reinforcement for ordinary building work where corrosion is not a significant concern. For a basement slab or interior footing, GFRP is rarely chosen on cost.
Against corrosion-protected steel
Where reinforcement is exposed to chlorides, such as bridge decks, parking structures, balconies and marine work, the alternatives are epoxy-coated, galvanized or stainless steel bar. That is where GFRP competes. Epoxy coatings can be damaged in handling and need touch-up, and stainless steel is a premium material. A comparison on these jobs often looks very different from a comparison with black bar. Our article on GFRP vs steel rebar covers the performance side of that choice.
Design differences change the quantity
GFRP is much less stiff than steel and does not yield before it breaks. Engineers design GFRP-reinforced concrete under CSA S806 for buildings or CSA S6 for bridges, and deflection and crack control often govern. The result can be more bars, larger bars or closer spacing than the steel design. Comparing equal sizes of steel and GFRP bar per metre is not a real comparison. Compare the cost of the steel design with the cost of the GFRP design.
GFRP in part of the structure
Some designs use GFRP only where exposure is worst, for example in the elements or layers closest to salt and water, and steel elsewhere. Whether that is appropriate is the engineer's decision, not a purchasing one, but if your drawings mix the two, the quote should price each material from its own bar list. It also means two products to schedule, so check that the GFRP and steel deliveries line up with the pour sequence.
Installed cost
On site, some costs go down and some go up:
- Lighter handling. Crews can carry and place GFRP more easily, which can speed up placing.
- Cutting. GFRP is cut with a saw or abrasive blade rather than sheared. Manufacturer guidance is not to shear it.
- Ties and supports. Plastic-coated tie wire or non-metallic ties are typical, and at least one manufacturer recommends closer support spacing than for steel.
- No field bending. Every bent piece has to be detailed and ordered correctly in advance, so mistakes can't be fixed on site with a bender.
Life-cycle cost
The case for GFRP rests on durability. A Minnesota Department of Transportation assessment of GFRP-reinforced bridge decks found that a GFRP deck was less costly than a steel-reinforced deck over the same service life, mainly because of lower maintenance, and that the advantage grew with longer service lives. That kind of result applies to exposed structures where steel corrosion drives repair costs, not to every slab.
When GFRP is worth pricing
It makes sense to price GFRP alongside steel when:
- The structure is exposed to de-icing salts or seawater and is expected to last a long time.
- The design needs reinforcement that is non-magnetic or non-conductive, for example near sensitive equipment.
- Corrosion repairs would be disruptive or expensive to carry out later.
- The owner or a transportation authority already specifies it.
For ordinary residential foundations and interior slabs, steel is normally the practical choice.
How to get an accurate GFRP quote
Send your supplier:
- The GFRP design drawings and specification, including bar diameters, grade and any durability class.
- A bar list or schedule showing straight lengths and every bent shape, or the drawings for a take-off.
- Documentation requirements, such as CSA S807 compliance, MTO DSM listing or quality control reports.
- Your schedule and delivery address.
If you are still deciding between steel and GFRP, ask for both priced from their own designs. For what to specify and how ordering works, see our guide to buying GFRP rebar in Ontario.
Get GFRP pricing
GFRP pricing depends on diameter, shapes, quantity and documentation, so we quote it job by job rather than publishing a rate. Send us your drawings or bar list and we'll price GFRP, and steel for comparison if you want it. See our rebar products for the straight, fabricated and GFRP bar we supply.
Frequently asked questions
Is GFRP rebar cheaper than steel?
Per metre of bar, GFRP generally costs more than plain black steel rebar. It can compare well against corrosion-protected options such as stainless steel, and over the life of an exposed structure it can come out ahead because it does not corrode.
Is fiberglass rebar more expensive than steel?
Up front, usually yes when compared with uncoated steel of a similar size. Lower handling weight, no coating damage to repair and less long-term maintenance can narrow or reverse the gap, depending on the structure and exposure.
Why is fiberglass rebar priced per foot or per metre instead of per tonne?
GFRP is much lighter than steel, so pricing by weight would not reflect what you are buying. Suppliers commonly quote straight bar by length and bent shapes by the piece.
Can I swap steel rebar for the same size of GFRP to save money?
No. GFRP is far less stiff than steel and is designed under different CSA standards, so the bar size and spacing usually change. Any substitution needs a design by the engineer.
