Carpenter Red Seal Exam Prep · Question
What is the primary reason for placing 'chairs' or 'spacers' under rebar in a concrete slab-on-grade?
Chairs and spacers are used to precisely position the rebar (reinforcing steel) at the specified height within the concrete element, ensuring the correct concre
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Question: What is the primary reason for placing 'chairs' or 'spacers' under rebar in a concrete slab-on-grade?
Answer options:
- To tie the rebar together securely.
- To suspend electrical conduit within the slab. ✅ To ensure the rebar is positioned correctly within the concrete cover.
- To provide a non-slip surface for workers during concrete placement.
Correct answer: To ensure the rebar is positioned correctly within the concrete cover.
Explanation: Chairs and spacers are used to precisely position the rebar (reinforcing steel) at the specified height within the concrete element, ensuring the correct concrete cover is achieved.
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- When interpreting a foundation plan, a dashed line with 'P. WALL' typically represents which of the following?
- A site plan shows contour lines with an interval of 0.5 m. If two adjacent contour lines are labelled 124.0 m
- According to the National Building Code of Canada (NBC) 2020, what is the primary consideration for the requir
- Two offset stakes are driven at 2.0 m from the proposed edge of a concrete slab. The first stake is marked 'Cu
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