Rebar and Reinforcing Spacers

Spacers and cover blocks for positioning reinforcing steel in concrete slabs, columns and structural elements.

7 active products

Rebar Chair Spacer / Cover Block

Code: R15

Konsa rebar chair spacers support horizontal reinforcement in suspended slabs, beams and floor slabs while maintaining the specified concrete cover. The concave seat accommodates rebar from 6 mm to 40 mm, with cover options from 15 mm to 150 mm. Sizes from 60 mm to 100 mm are manufactured with a wider base for improved stability on softer supporting surfaces. Typical usage is approximately 2–4 spacers per square metre, subject to the reinforcement layout and project requirements.

Concrete Chair Spacers / Cover Blocks

Code: CR30

Konsa concrete chair spacers provide stable support for reinforcement while maintaining the required concrete cover. Manufactured from 32 MPa concrete and supplied with blackened wire ties, the spacers are water-cured for 15 days and dry-cured for a further six days to develop their intended strength. Available cover sizes and spacer diameters are listed in the product specification table.

Heavy-Duty Plastic Chair Spacer

Code: H25

Konsa heavy-duty plastic chair spacers support horizontal reinforcement in slabs and precast concrete applications. Their small contact area helps minimise the visible footprint against the formwork, while the concave seat accommodates rebar from 6 mm to 50 mm. Cover heights range from 25 mm to 80 mm. Spacers can be supplied with galvanised binding-wire ties by adding “W” to the product code, and custom sizes are available subject to manufacturing requirements.

Wheel Spacer / Circular Spacer

Code: WS36

Konsa plastic wheel spacers clip onto reinforcing bar to maintain consistent concrete cover around vertical reinforcement. The circular design provides support through 360 degrees, making these spacers suitable for columns, walls and beams. Multiple models are available for different rebar diameters and cover requirements; select the correct product code from the specification table for the reinforcement used on the project.

Heavy-Duty Plastic Combination Chair Spacer

Code: C20

Konsa heavy-duty plastic combination chair spacers provide several cover heights from a single spacer, simplifying stock selection across slabs, walls, columns and precast concrete work. The compact formwork contact area and support for rebar from 6 mm to 40 mm make them a practical alternative to fibre-cement spacers. They can be supplied with or without galvanised binding-wire ties for faster placement and secure positioning.

Screed Chairs

Code: WPS

Konsa screed chairs create temporary, adjustable support for a screed rail during concrete slab construction. They are designed to carry a 50 mm scaffold tube used as the screed rail for roller-striker and slab-finishing operations. Chairs are typically positioned at approximately 1.5 m intervals, subject to site conditions and equipment loads. After levelling, the rail is removed, the threaded top section is unscrewed and the surface can be finished by hand.

Top Clip Rebar Spacer

Code: TCC20

Konsa top-clip rebar spacers clip onto reinforcing bars to maintain concrete cover. Available in multiple cover depths for common rebar diameters; confirm cover requirements before ordering.

Rebar Spacer Guide

Rebar spacers are used to position reinforcing steel at the required distance from formwork, shuttering, blinding or other surfaces before concrete is placed. Their purpose is to help maintain the specified concrete cover around the reinforcement and to keep reinforcing bars correctly positioned during construction.

Konsa supplies a range of rebar spacers and reinforcement support products for slabs, walls, columns, beams, precast applications and general reinforced concrete construction.

What Are Rebar Spacers?

Rebar spacers, also referred to as reinforcement spacers or concrete cover spacers, support reinforcing bars and mesh at a controlled distance from the surrounding formwork or surface.

The spacer creates the required separation between the reinforcement and the outside face of the finished concrete. This allows concrete to flow around the steel and helps the reinforcement remain in the position specified by the structural design.

Why Concrete Cover Matters

Concrete cover is the distance between the reinforcing steel and the finished surface of the concrete.

Maintaining the specified cover is important because it helps protect reinforcement from environmental exposure, assists with durability and ensures the steel remains in the position intended by the engineer.

If reinforcement moves during concrete placement, the finished cover may differ from the design requirement. Correctly selected and positioned spacers help reduce this movement.

Where Rebar Spacers Are Used

Reinforced concrete slabs
Foundations and footings
Beams
Columns
Reinforced concrete walls
Precast concrete elements
Mesh reinforcement
General concrete construction

Choosing the Correct Rebar Spacer

The correct spacer depends on the required concrete cover, reinforcement size, orientation of the reinforcement and the type of concrete element being constructed.

When selecting a spacer, consider:

Required concrete cover
Reinforcing bar or mesh size
Horizontal or vertical application
Formwork or supporting surface
Stability of the reinforcement during concrete placement
Project-specific engineering requirements

The engineer's drawings and project specifications should always determine the required cover.

Benefits of Using the Correct Reinforcement Spacer

Maintain Reinforcement Position
Helps hold reinforcing steel in its intended position before and during concrete placement.
Maintain Specified Cover
Provides controlled separation between reinforcement and the surrounding formwork or surface.
Improve Installation Consistency
Purpose-made spacers provide a more repeatable method of supporting reinforcement than improvised site solutions.
Support Different Applications
Different spacer designs can be selected for slabs, walls, columns, beams and other reinforced concrete applications.

Konsa Rebar Spacers

Konsa supplies rebar spacers and reinforcement support products for a wide range of reinforced concrete applications. Browse the construction products catalogue for the full range of reinforcement accessories.

The range includes different spacer configurations intended to suit various reinforcement layouts and concrete cover requirements.

Customers should select products according to their project drawings, reinforcement arrangement and specified concrete cover. Related reinforcement accessories, including mechanical rebar splicing and couplers, are available where project details require them.

View Rebar Spacer Products

Need help selecting a spacer?

Contact Konsa with your required concrete cover, bar size and application and our team can help identify suitable products from the available range.

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Rebar Spacer FAQs

What is a rebar spacer?

A rebar spacer is a purpose-made support used to position reinforcing steel at a controlled distance from formwork, shuttering or another surface before concrete is placed.

Why are rebar spacers used?

They are used to help maintain the required concrete cover and to support reinforcing steel in the position shown on the structural drawings.

How do I choose the correct spacer size?

The spacer should be selected according to the required concrete cover, reinforcing bar or mesh arrangement and the type of application. The project drawings and engineer's specification should determine the required cover.

Can the same spacer be used for every application?

No. Different reinforcement layouts and concrete elements may require different spacer designs. Slabs, walls, columns, beams and precast applications can have different support requirements.

Where should spacers be positioned?

Spacers should be positioned so that the reinforcement remains adequately supported and maintains the specified cover. Exact spacing and placement should follow the project design, engineering requirements and site conditions.

Can Konsa help identify a suitable spacer?

Yes. Customers can provide the required concrete cover, reinforcement size and application details and Konsa can help identify suitable products from its available range.