Horizontal bars are centered by positioning chairs.

• A. True
• B. False
• C. Not specified
• D. Depends on bar size

Answer: (B)

Positioning reinforcing bars with chairs is about getting the bar at the correct height and keeping the required concrete cover, not about centering the bar horizontally within the form. Rebar chairs support the bars so they sit at the specified vertical position relative to the form, ensuring the cover from each face is correct and the bars stay in place during the pour. Horizontal centering within the panel is determined by the form geometry and the overall bar layout, not by the chairs alone. So the statement isn’t correct because chairs mainly establish vertical placement, while horizontal centering relies on the form dimensions and design.