Concrete Inspection NYC — BC 1704.4 Special Inspections
DOB-required concrete special inspections by an IAS-accredited Registered Special Inspection Agency. Reinforcement inspection, concrete placement monitoring, cylinder testing, batch plant inspection, and post-tensioning oversight throughout all NYC boroughs.
NYC Concrete Special Inspection Requirements
Concrete special inspection in NYC is governed by NYC Building Code BC 1704.4, which parallels ACI 318's quality assurance requirements. Because concrete's structural performance is determined by field conditions — mix design, water-cement ratio, temperature, consolidation, and curing — third-party inspection is essential to verify compliance before these variables are sealed permanently into the structure.
Our inspectors are ACI-certified and experienced with all phases of concrete construction: pre-placement reinforcement inspection, concrete delivery verification, placement monitoring, field testing, and curing oversight. We also coordinate with approved testing laboratories for compressive strength cylinder testing.
We perform concrete inspections for foundations, slabs on grade, elevated decks, walls, columns, and post-tensioned systems. Our inspectors are familiar with both standard cast-in-place and specialty concrete applications including high-strength concrete, self-consolidating concrete, and concrete in special exposure conditions.
Concrete Inspection Scope
FAQs: Concrete Special Inspections in NYC
What is concrete special inspection in NYC?
Concrete special inspection is mandatory third-party oversight required by NYC BC 1704.4. A Registered Special Inspection Agency verifies reinforcing steel placement, concrete delivery, field testing, placement, and curing — certifying compliance with ACI 318 and approved design documents.
When is concrete inspection required in NYC?
Required under BC 1704.4 for structural concrete over 2,500 psi, post-tensioned concrete, prestressed concrete, and concrete in special exposure conditions. The required inspection scope is defined in the TR1 Statement of Special Inspections filed through DOB NOW.
What tests are performed during NYC concrete inspections?
Concrete inspections include: slump tests (ASTM C143), compressive strength cylinder casting (ASTM C31/C39), temperature measurement, air content (ASTM C231), unit weight, and reinforcement verification. Batch plant inspections verify mix design compliance at the production source.