Question 1

What are bar chairs and spacers used for in concrete reinforcement?

Accepted Answer

Bar chairs and spacers support reinforcing bars and mesh at the correct elevation within concrete, helping to maintain proper concrete cover and improve structural durability.

Question 2

Why is correct concrete cover important?

Accepted Answer

Correct concrete cover protects steel reinforcement from corrosion, supports compliance with engineering specifications, and enhances the long-term durability of concrete structures.

Question 3

What types of spacers and chairs are available?

Accepted Answer

Common reinforcement accessories include plastic bar chairs, wire bar chairs, concrete chairs and spacers, available in a range of heights to suit different reinforcement requirements.

Question 4

How do I choose the right height for a bar chair or spacer?

Accepted Answer

Spacer height should be selected based on required concrete cover and slab thickness. Bar chairs commonly range from around 20 mm to 100 mm or more depending on reinforcement depth.

Question 5

Can plastic bar chairs be used with heavy reinforcement?

Accepted Answer

Yes. Plastic bar chairs provide stable, non-corrosive support for many slab, beam and footing applications, although very heavy reinforcement may require more rigid spacer solutions.

Question 6

What materials are bar chairs and spacers made from?

Accepted Answer

Bar chairs and spacers are commonly manufactured from plastic, welded wire or concrete, with plastic and coated wire options offering ease of installation and corrosion resistance.

Question 7

Are these reinforcing accessories compliant with Australian standards?

Accepted Answer

Reinforcement accessories used in Australian construction are designed to support compliance with relevant structural and building codes when installed correctly with reinforcing bars and mesh.

Question 8

How should spacers be placed before pouring concrete?

Accepted Answer

Spacers should be positioned at regular intervals to ensure reinforcement remains correctly located during concrete placement and curing, preventing sagging or movement.

Question 9

How many bar chairs are needed per square metre?

Accepted Answer

Bar chairs are typically spaced at approximately 0.8 to 1.5 metres apart, depending on reinforcement size and stiffness, to provide reliable support.

Question 10

What accessories support vertical reinforcement in walls and columns?

Accepted Answer

For vertical reinforcement such as walls and columns, ring spacers or wheel spacers are commonly used to maintain correct concrete cover and bar alignment.

Question 11

Do bar chairs help speed up concrete construction?

Accepted Answer

Yes. Using bar chairs and spacers allows reinforcement to be positioned quickly and consistently, reducing labour time and minimising installation errors.

Question 12

Can accessories like base plates be used with bar chairs?

Accepted Answer

Yes. Base plates can be used with bar chairs on soft or uneven ground to prevent sinking and help maintain accurate concrete cover before pouring.

Question 13

Are spacers reusable or disposable?

Accepted Answer

Most plastic and wire spacers are designed for single use and remain embedded in the concrete, while concrete spacers are rigid but also stay permanently in place.

Question 14

Can spacers be used for both slab and beam reinforcement?

Accepted Answer

Yes. Bar chairs and spacers are suitable for reinforcing bars and mesh in slabs, beams, footings and other structural concrete elements.

Question 15

Do these accessories come in packs with standard counts?

Accepted Answer

Yes. Bar chairs and spacers are typically supplied in packs containing multiple units at standard heights to suit common reinforcement coverage requirements.

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