NYC Concrete Safety Manager (CSM), in depth

What the CSM does, day to day

A NYC Concrete Safety Manager (CSM) is a DOB-certified individual responsible for the safety of all concrete operations on a NYC Major Building under BC §3310.10. The CSM is in addition to (not instead of) the project's Site Safety Manager (§3310). On smaller projects, one person holding both credentials may cover both roles legally and practically. On larger or higher-complexity projects, dedicated personnel are safer.

BC §3310.10 establishes the CSM credential requirement. BC §3315 defines the operational requirements the CSM enforces: pre-pour inspection, formwork and shoring standards, pour card documentation, stripping conditions, and reshoring removal sequence.

The federal frame for concrete and masonry construction safety is OSHA 29 CFR 1926 Subpart Q. NYC's §3315 and §3310.10 add local-specific requirements on top of the federal floor, including the CSM credential requirement itself, which has no federal equivalent.

The CSM's daily work centers on three operations: formwork, pours, and stripping/reshoring. Each is inspected, documented in the CSM logbook, and signed off before the next operation begins. A CSM who's not present for a pour, or who doesn't inspect formwork before concrete is placed, has failed the role.

Formwork inspection

Formwork is the temporary structure that holds wet concrete in place until it cures. It bears the full weight of the freshly placed concrete, the workers walking on it, and any equipment on the pour deck. Inadequate formwork has caused some of the most consequential construction events in NYC history. Multi-story collapses with fatalities are not historical anomalies. They're the reason §3310.10 and §3315 exist.

The engineering reference for formwork design is ACI 347 ("Guide to Formwork for Concrete"), published by the American Concrete Institute. ACI 347 governs how formwork is designed and constructed to safely carry the imposed loads. The CSM reads the project's formwork drawings against ACI 347 principles and the structural engineer's specifications.

The CSM's pre-pour formwork inspection covers:

• Geometry and dimensions. Formwork dimensions match the structural drawings. Ties, walers, and supports are spaced as designed.
• Tie integrity. Every tie in place and properly torqued. Missing or loose ties produce blowouts under placement pressure.
• Support condition. Vertical shores plumb, base plates on solid bearing, no visible damage or eccentricity.
• Bracing. Diagonal bracing in place per the formwork engineer's plan and ACI 347.
• Embeds and openings. Sleeves, anchors, blockouts, and openings located correctly per drawings.
• Surface preparation. Release agent applied, debris cleared, water removed from the deck.
• Reinforcement. Rebar tied, spaced, and chaired per the structural drawings and ACI 318 ("Building Code Requirements for Structural Concrete"). Coordinated with the project's special inspector.

The CSM signs off in the logbook only when these conditions are confirmed. Pour cannot begin until sign-off is recorded.

Shoring and reshoring

Shoring is the temporary support placed beneath a pour deck to bear the weight of the pour and the cure period. Reshoring is the partial replacement support placed beneath stripped formwork to bear the partial load of an immature concrete deck while it continues to cure.

Both operations are governed by BC §3315 and the project's engineer-of-record strip-and-reshore plan. The ACI 347 guidance on shoring and reshoring loads is the engineering reference.

The CSM verifies:

• Shoring layout matches the formwork engineer's plan and BC §3315 requirements
• Shore capacity is sufficient for the design load at the pour stage
• Installation sequence is correct: shores in place before form load is applied
• Reshoring sequence is staged correctly through the building's vertical concrete sequence
• Removal sequence matches the structural engineer's strip-and-reshore plan

A common mistake on NYC sites: removing shores before the concrete has reached the strength specified by the structural engineer. The result is a deck that deflects under its own weight, sometimes catastrophically. The CSM's logbook entry on shoring condition is the primary documentation that the sequence was followed.

Pour day discipline

On pour day, the CSM is on site from before the first truck arrives until pour completion. BC §3315 requires pre-pour inspection and sign-off before placement begins.

Verification at delivery, per the project's quality control plan:

• Mix tickets. Verify the delivered mix matches the specification for the pour. ACI 318 governs concrete mixture proportioning requirements.
• Slump tests. Performed and documented per the project's QC plan and ASTM standards referenced in the specifications.
• Air content tests. For air-entrained mixes, measured and documented.
• Temperature. Concrete temperature within the specified range. Cold-weather and hot-weather concreting both have specific temperature limits referenced in OSHA 29 CFR 1926 Subpart Q and the project specifications.
• Time on truck. From batch plant to delivery, within the time limit specified in the mix design.
• Visual inspection. No visible segregation, contamination, excessive water addition, or unusual appearance.

Trucks that fail any of these get rejected. Rejecting a truck of concrete backs up the pour schedule and costs money. That's exactly what the CSM is there to do when the situation requires it.

During the pour, the CSM monitors:

• Placement rate. Pours that go too fast can blow out formwork. Pours that go too slow risk cold joints between successive placements.
• Vibration. Proper consolidation without over-vibration or segregation. OSHA 29 CFR 1926 Subpart Q addresses concrete placement safety requirements for the workers involved.
• Finishing. Appropriate to the specification: broom finish, trowel finish, exposed aggregate.
• Ambient conditions. Wind, sun, rain, and temperature each affect cure rate and surface quality.

Sign-off in the CSM logbook records every inspection performed, every test result, rejected loads, and the final accepted pour.

Stripping and reshoring removal

Forms are stripped after the concrete has reached a specified strength, typically a percentage of the 28-day design strength confirmed through field-cured cylinder breaks at a DOB-accepted testing laboratory. BC §3315 governs the stripping operation.

The structural engineer specifies the minimum strength for each strip operation in the strip-and-reshore plan. ACI 318 specifies minimum curing periods and strength requirements for structural concrete.

The CSM verifies:

• Break test results from the testing lab match or exceed the engineer's specified strip strength for this pour
• Stripping sequence does not impose unsupported loads on the newly stripped deck
• Reshoring is confirmed in place and bearing properly before forms come away
• Final reshore removal waits until the deck has reached full design strength, the building above is bearing properly on the completed structure, and the structural engineer's sign-off is in hand

A frequent NYC failure mode is reshoring removal before the deck has fully matured. The CSM's logbook discipline, specifically the break test records and the sequence sign-offs, is the project's primary defense against this.

Common failure modes

The patterns we see, in order of frequency:

1. Premature stripping. Forms removed before concrete has reached the specified strip strength. Result: deck deflection, cracking, in worst case structural failure.
2. Inadequate shoring sequence. Shores removed in the wrong order or before minimum strength. Result: load redistribution to immature concrete below.
3. Cold-weather pour failures. Concrete placed in cold conditions without adequate curing heat or enclosure. Result: low ultimate strength, freeze damage. OSHA 29 CFR 1926 Subpart Q and ACI 306 govern cold-weather concrete requirements.
4. Hot-weather pour failures. Concrete placed in high temperatures without retarder or hydration controls. Result: rapid set, plastic shrinkage cracking. ACI 305 governs hot-weather concrete.
5. Tie failures during placement. Inadequate tie torque or missing ties produce blowouts.
6. Reinforcement placement errors. Rebar not tied or chaired correctly produces deflection under service loads. Caught pre-pour by the CSM and the special inspector per ACI 318 requirements.
7. Documentation gaps. Pours that happened but weren't fully logged. Result: no defense if a structural problem surfaces later.

Each of these is preventable with a CSM doing the role at field level.

Dual SSM + CSM credentials

Many NYC managers hold both the DOB SSM and the DOB CSM credential. This unlocks a few project structures:

• One-person coverage on smaller projects. Where pour scope is limited, one dual-credentialed manager can cover SSM (§3310) and CSM (§3310.10) duties legally and practically.
• Higher pay band. SSM is a hiring priority for credentialed CSMs. Dual-credential holders command higher rates.
• Coverage continuity. A single manager who knows the project from foundation through topping-out provides better continuity than two separate managers.

For very large concrete operations (multiple cranes, simultaneous decks, mat pours over 1,000 cubic yards), dedicated personnel are safer. Dual coverage is a sizing call made per project.

How ACI standards fit in

NYC §3310.10 and §3315 reference the engineering discipline of structural concrete construction. The reference standards:

• ACI 318 ("Building Code Requirements for Structural Concrete"). Published by the American Concrete Institute. The structural design code: governs what the concrete must do, minimum strength requirements, reinforcement detailing, and durability. CSMs read project drawings against ACI 318.
• ACI 347 ("Guide to Formwork for Concrete"). Published by the American Concrete Institute. The formwork engineering reference: governs how formwork is designed and constructed to safely carry concrete loads. CSMs read formwork plans against ACI 347.
• ACI 301 ("Specifications for Structural Concrete"). Project specifications frequently reference ACI 301 for concrete quality requirements.
• ACI 305 / ACI 306. Hot-weather and cold-weather concreting guides respectively, referenced when ambient conditions approach the limits for standard placement.

A NYC CSM doesn't have to be an ACI Concrete Field Testing Technician (though many are). They do need to read and work from the project's formwork and structural drawings against these standards.

Bottom line

The NYC CSM is the credentialed individual responsible for concrete operations on a Major Building under §3310.10 and §3315. Formwork inspection before pour (against ACI 347), mix and test verification at delivery (per ACI 318 and project specs), monitoring during placement (per OSHA 29 CFR 1926 Subpart Q and §3315), sign-off on stripping and reshoring removal (per the structural engineer's strip-and-reshore plan): every operation is documented in the CSM logbook. Failure modes are catastrophic when they happen. The CSM's job is to make sure they don't.

Skilled Safety Management staffs DOB-certified CSMs on NYC concrete operations, including dual SSM + CSM coverage where project scope allows.

Frequently asked questions

Working on a NYC project? Skilled Safety Management staffs licensed Site Safety Managers, Coordinators, Concrete Safety Managers, and FDNY Fire Safety Managers throughout the five boroughs. Send your project details through our contact form or call (212) 498-8863 for a fixed-fee proposal in 24 hours.