Which statement about reinforcing mats is correct?

• A. Mats may be left loose
• B. Mats must be welded to the forms
• C. Mats do not require tying
• D. Mats must be properly supported and tied to allow workers to walk on them

Answer: (D)

Reinforcing mats must be secure and stable so workers can move safely on them. Properly supporting and tying the mats keeps them from shifting under load, creating a solid, walkable surface and keeping the rebar in the correct position relative to the formwork. Leaving mats loose can lead to movement, trips, or misalignment. Welding mats to the forms isn’t required and can hinder proper securing and adjustment, while mats do need to be tied to maintain position. For safe access and accurate placement, they should be properly supported and tied to allow workers to walk on them.