Carpenter Red Seal Exam Prep · Question
A crew is tying rebar for a suspended slab. The rebar schedule calls for 15M bars at 200 mm on centre in both directions, top and bottom, with a specified concrete cover of 25 mm. What is the primary purpose of using 'chairs' to support the top layer of rebar?
Chairs, often made of plastic or wire, are used to hold rebar at the correct height within the formwork, thereby ensuring the specified concrete cover is mainta
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Question: A crew is tying rebar for a suspended slab. The rebar schedule calls for 15M bars at 200 mm on centre in both directions, top and bottom, with a specified concrete cover of 25 mm. What is the primary purpose of using 'chairs' to support the top layer of rebar?
Answer options:
- To prevent oxidation of the rebar ✅ To maintain the specified concrete cover between the rebar and the formwork
- To simplify the rebar tying process
- To distribute the load of the wet concrete evenly
Correct answer: To maintain the specified concrete cover between the rebar and the formwork
Explanation: Chairs, often made of plastic or wire, are used to hold rebar at the correct height within the formwork, thereby ensuring the specified concrete cover is maintained. This cover protects the rebar from corrosion and ensures adequate bond strength. They do not prevent oxidation directly, simplify tying, or distribute concrete load.
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