How do I mark out my floor penetrations before the concrete floor is poured

Plain-English answer

Use a high-precision Total Station surveying laser tool or pull precise layout measurements manually off the primary structural surveyor baseline grid marks on the wood form decks.

Fasten your wooden or foam structural block-out boxes securely to the deck forms at those exact coordinate locations, and double-check your measurements right before the concrete mixer trucks begin pouring out the slab.

Field checklist

• Use a high-precision Total Station surveying laser tool or pull precise layout measurements manually off the primary structural surveyor baseline grid marks on the wood form decks.
• Fasten your wooden or foam structural block-out boxes securely to the deck forms at those exact coordinate locations, and double-check your measurements right before the concrete mixer...

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Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.

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