Published 2026-10-22 · last updated 2026-10-22 · Remarkable Group
Concrete cover protects steel reinforcement against corrosion, among other things, alongside bonding and fire resistance. Non-corrosive reinforcement (carbon, AR glass, basalt) carries no corrosion risk, so that component of the cover requirement can be removed or reduced; bonding and fire resistance remain relevant. How much cover is needed, and whether that saves design space or weight, is determined by the structural engineer based on the applicable standard, not by this article.
Anyone who works with reinforcement soon encounters the term concrete cover: the layer of concrete between the outside of a structure and the reinforcement inside it. With non-corrosive reinforcement (carbon, AR glass, basalt), the role of that layer changes, but it does not automatically disappear. This article explains why, without stating a cover value or standard number itself: that is decided by the structural engineer, per project.
Concrete cover fulfils several roles at once for traditional steel reinforcement:
moisture, oxygen or chloride reach the steel and start corrosion. The thicker and denser the cover, the longer that takes.
heat of a fire; sufficient cover keeps the steel reinforcement below the temperature at which it loses its strength for longer.
the transfer of force between steel and concrete; too little cover can weaken that bond and therefore the cooperation between the materials.
Together with the load and the environment, these three requirements determine how much cover a structural engineer specifies for steel reinforcement.
Carbon, AR glass and basalt are not metals and therefore have no electrochemical corrosion process. The corrosion protection that fills part of the concrete cover requirement for steel does not apply in the same way to these materials.
That does not mean cover becomes unnecessary: bonding and, depending on the material and application, fire resistance still play a role. Remarkable states this on the REBAR carbon product page itself as "corrosion-resistant with reduced concrete cover requirements": reduced, not zero, and without a specific figure or standard reference. The same principle applies in essence to other non-corrosive reinforcement products such as ANTICRACK and GRID carbon, although the exact details differ per product and application.
The final concrete cover in a project is not a fixed figure that follows automatically from the material itself. The structural engineer determines it based on:
type;
without corrosion risk);
This article explains the principle (less cover is possible because corrosion drops out as a reason), not the outcome for a specific project. If in doubt, request the technical data sheet of the chosen product via the product page, and have the cover determined by the structural engineer.
Remarkable products: REBAR carbon (carbon reinforcement bar, literally stating "reduced concrete cover requirements" on the product page), ANTICRACK and GRID carbon (carbon reinforcement meshes).
See also Repairing cracks in masonry with non-corrosive reinforcement for the broader application of non-corrosive reinforcement in repair work.
Concrete cover is the layer of concrete between the outer surface of a structure and the reinforcement inside it. For steel reinforcement, that layer determines, among other things, how long it takes before moisture, oxygen (or chloride) reach the steel and corrosion can start.
No. Corrosion protection is one of the reasons for concrete cover, but not the only one: bonding between reinforcement and concrete, and fire resistance, remain relevant, even with carbon, AR glass or basalt. Non-corrosive reinforcement can remove or reduce the corrosion component of the cover requirement, but cover does not automatically disappear entirely.
The REBAR carbon product page lists as a feature "corrosion-resistant with reduced concrete cover requirements". Remarkable deliberately does not state a specific figure or standard number here; the cover needed in a specific design is determined by the structural engineer using the applicable standard.
The structural engineer, based on the applicable standard, the exposure class (environmental aggressiveness), the fire resistance requirement and the chosen reinforcement material. This article explains the principle; it does not replace a structural calculation.
Less cover can save space in a slender design, or leave more room for the reinforcement itself at the same outer dimension. Whether and how much that delivers in a specific project depends on the design and the structural engineer's decision; this article explains the principle, not a fixed saving.
Our specialists will gladly help you choose the right material.