The helper rolled out 6x6 wire mesh on the poly, and the foreman says they'll hook it up with a rake as they pour the 4-inch slab.

Three code violations (ACI 318/IRC R403):

1. Mesh on poly = zero cover. 6×6 W2.9/W2.9 on vapor barrier puts steel at slab bottom. ACI 318-19 §20.5.1.3 requires ¾" clear cover for slabs on ground. Wire must be supported on chairs/blocks before pour. "Hooking with a rake" is prohibited (ACI 301 §5.3.3); it bends wires, creates voids, and yields random depth—usually still on poly.

1. Corner rebar on dirt = zero cover & continuity failure. Thickened-edge footing corners require continuous reinforcement (IRC R403.1.3.5). Bars on grade violate 3" cover (ACI 318 §20.6.1.3) against earth. They also cannot develop lap splices or corner tension if not suspended.

1. No support system. Both mat and footing steel need chairs, dobies, or plastic spacers placed before concrete. Raking is not a placement method.

Fix now:

• Stop pour. Lift mesh onto ¾"-high chairs (2'–3' grid).
• Prop corner bars on 3"-high dobies/blocks; ensure laps per Table R403.1.3.5.
• Verify all steel position before mud hits forms.

Several critical issues here violate ACI 318 and standard concrete practice:

1. Wire mesh on poly (vapor barrier): Placing welded wire reinforcement (WWR) directly on polyethylene sheeting is incorrect. The mesh must be supported above the vapor barrier to achieve proper embedment depth (typically mid-slab for crack control). If left on the poly, it will settle or be displaced during pouring, ending up too low — reducing effectiveness and risking corrosion due to moisture entrapment. Use chairs or dobies to support mesh at the correct height (usually 1–2 inches from the bottom for a 4" slab).

1. Hooking mesh with a rake during pour: Raking mesh into place during pour is unacceptable and unsafe. It displaces the reinforcement, creates inconsistent cover, and risks worker injury. Mesh must be pre-placed and secured on chairs before pouring. Raking can also damage the vapor barrier.

1. Corner rebar lying on dirt in thickened edge: Rebar must have minimum 3 inches of concrete cover when cast against soil (ACI 318-19 §20.6.1.3). Lying on dirt means zero cover — leading to rapid corrosion, spalling, and structural failure. Thickened edges (grade beams) require rebar to be supported on chairs or blocks to maintain position and cover.

Corrective action:

• Remove mesh, install proper supports (chairs/dobies) at correct height.
• Re-place mesh flat and secure before pour.
• Lift corner rebar, place on dobies to achieve 3" min. cover against soil.
• Do not allow raking of reinforcement during pour — it’s a quality and safety violation.

If the foreman insists on current method, halt work — this risks slab cracking, premature deterioration, and potential rejection by inspector. A licensed concrete contractor or engineer should review. (Word count: 248)