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Rebar Chair
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Product Details
A rebar chair is a plastic or metal support used to hold reinforcing steel (rebar) at the correct height inside concrete forms. It ensures the rebar stays off the ground and is properly positioned so the concrete fully surrounds it.
️ What a Rebar Chair Does
✔ Keeps rebar elevated from the ground
Ensures proper concrete cover (usually 1"–3" depending on code).
✔ Prevents movement during concrete pour
Keeps the reinforcement in the correct place so the structure stays strong.
✔ Increases structural strength
Correct spacing prevents corrosion and ensures load transfer.
✔ Used in slabs, foundations, sidewalks, driveways
Every concrete slab with rebar needs chairs.
Types of Rebar Chairs
1. Plastic Rebar Chairs
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Most common
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Corrosion-proof
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Used in slabs and foundations
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Heights vary: 1", 1.5”, 2”, 3”, 4”, 6” etc.
2. Metal Rebar Chairs (Wire Chairs)
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Used in commercial construction
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Heavy-duty
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Ideal when concrete cover requirements are strict
3. High-Chair / Double Mat Chairs
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Used when there are two layers of rebar
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Supports the top mat above the bottom mat
4. Slab Bolster
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Long strip that supports rebar continuously
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Perfect for floors and large slabs
Where Rebar Chairs Are Used
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Concrete slabs
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Sidewalks
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Driveways
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Basement floors
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Garage floors
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Foundations & footings
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Commercial slabs-on-grade
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Reinforced walls (with special chairs)
Common Sizes (USA Hardware Stores)
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1"
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1-1/2"
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2"
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2-1/2"
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3"
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3-1/2"
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4"
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5"–6"
Most common in retail stores: 1", 2", 3" plastic rebar chairs.
✔ Riztech Simple Customer Explanation
“Rebar chairs keep the rebar lifted and in the correct position so the concrete fully covers it. Otherwise the rebar will rust or weaken the structure.”
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Rebar Chair
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