Property Inspection Services

Full Compliance Of Your Construction Projects

Twin Peaks, Inc. Special Inspections Agency License and Certification

TPI is a NYC DOB Class I Special Inspections Agency (License No. 000317) for all special inspection categories. Our inspection and testing services are accredited by International Accreditation Services (IAS), an independent accreditation body operating under the International Code Council (ICC).

TPI is accredited by the International Standard Organization for the operation of various inspections under ISO/IEC 17020:2012 Conformity Assessment. As part of this accreditation program, IAS has evaluated and verified the efficacy of our technicians, equipment, and TPI’s written documentation of its quality program, calibration procedures, personnel training, and impartiality.

TPI’s Non-Destructive Testing (NDT) services meet all the requirements of ASTM E543 and are outlined in TPI’s written procedures; they were audited and approved by a certified ASNT NDT Level III professional. All work performed by Twin Peaks, Inc. and its sub-consultants will follow these established quality procedures
and requirements.

Twin Peaks, Inc. has specialized in special inspections throughout New York City and the tri-state area since 1992. Our engineers and project managers have an average of 15-20 years of experience in the field, with concentrations in structural concrete, masonry, steel, geotechnical, SOE, mechanical, energy code, Life Safety Systems, and many more areas. These professionals will work tirelessly to ensure that your construction project is safe and built in conformance with the approved plans, specifications, and building codes.

Our Quality Assurance Promise

Special inspections are required to verify the quality of methods and materials used in construction projects. We maintain a high standard of quality for our clients and make the process as smooth and simple as possible.

Our project managers help clarify the Quality Assurance process and help our clients efficiently run the project. TPI monitors compliance at each stage of construction and immediately notifies clients of issues to enable the swift resolution that is necessary to keep projects on schedule and within the budget.

TPI provides objective verification for its clients’ projects to comply with the NY Building Code, and with the quality materials and methods specified in their plans. Our approach to fulfilling our clients’ needs comes from the vast number of qualified inspectors at our company.

Home Inspection

Detailed Special Inspections Checklist:

01. NYC Building Code Special Inspections
  • Structural Steel Welding
  • Structural Steel: Details
  • Structural Steel: High Strength Bolting
  • Structural Cold-Formed Steel
  • Concrete: Cast-In-Place
  • Concrete: Precast
  • Concrete: Prestressed
  • Masonry
  • Wood: Installation of High-Load Diaphragms
  • Wood: Installation of Metal-Plate-Connected Trusses
  • Wood – Installation of Prefabricated I-Joists
  • Subgrade Inspection
  • Subsurface Conditions: Fill Placement & In-Place Density
  • Subsurface Investigations (Borings/Test Pits) TR4
  • Deep Foundation Elements TR5
  • Helical Piles (BB # 2014-020) TR5H
  • Vertical Masonry Foundation Elements
  • Wall Panels, Curtain Walls, and Veneers
  • Sprayed Fire-Resistant Materials
  • Mastic and Intumescent Fire-Resistant Coatings
  • Exterior Insulation and Finish Systems (EIFS)
  • Alternative Materials – OTCR Buildings Bulletin
  • Smoke Control Systems
  • Mechanical Systems
  • Fuel-Oil Storage and Fuel-Oil Piping Systems
  • High-Pressure Steam Piping (Welding)
  • High-Temperature Hot Water Piping (Welding)
  • High-Pressure Fuel-Gas Piping (Welding)
  • Structural Stability – Existing Buildings
  • Excavations—Sheeting, Shoring, and Bracing
  • Underpinning
  • Mechanical Demolition
  • Raising and Moving of a Building
  • Soil Percolation Test: Private On-Site Storm Water
  • Drainage Disposal Systems and Detention Facilities
  • Private On-Site Storm Water Drainage Disposal
  • Systems and Detention Facilities Installation
  • Individual On-Site Private Sewage Disposal Systems
  • Installation
  • Soil Percolation Test: Individual On-Site Private
  • Sewage Disposal Systems
  • Sprinkler Systems
  • Standpipe Systems
  • Heating Systems
  • Chimneys
  • Fire-Resistant Penetrations and Joints
  • Aluminum Welding
  • Flood Zone Compliance (attach FEMA elevation/dry flood proofing certificate where applicable)
  • Luminous Egress Path Markings TR7
  • Emergency and Standby Power Systems (Generators)
  • Seismic Isolation Systems
  • Concrete Sampling and Testing TR2
02. NYC Building Code Progress Inspections
  • Preliminary 28-116.2.1
  • Footing and Foundation
  • Lowest Floor Elevation
  • Structural Wood Frame
  • Energy Code Compliance Inspections TR8
  • Fire-Resistance Rated Construction
  • Public Assembly Emergency Lighting 28-116.2.2
  • Final* 28-
  • Directive 14 of 1975 and 1 RCNY §101-10
03. NYS Special Inspections
  • Structural Steel
  • Structural Steel: High Strength Bolting
  • Structural Cold Formed Steel
  • Reinforced Concrete
  • Masonry
  • Subsurface Conditions: Fill Placement & In-Place Density
  • Density
  • Sprayed Fire-Resistant Materials
  • Fire-Resistant Penetrations and Joints
  • Construction Materials Testing Inspections
  • Asphalt Compaction Inspection
  • Soil Compaction Inspection
  • Concrete Batch Plant Inspection
  • Asphalt Batch Plant Inspection
  • Concrete Field Sampling and Testing Inspections
  • Schmidt Hammer Test
  • Freeze Thaw Inspection
  • Core Drilling
  • Petrographic Analysis
  • Chloride Ion Test
  • GPR Testing
  • Windsor Probe
  • Dynamic and Static Coefficient of Friction
  • Soil Bearing Capacity
  • Floor Flatness Test
  • Vibration and Crack Monitoring
  • Environmental Lab Tests
  • Tile Pull Test
  • Soil Infiltration Test
  • Soil Percolation Test
  • Hydrostatic Pressure Test on Mechanical Closure Device
  • Marine Door and Flood Door Water Test
  • Shrinkage Test
  • Pull Test
  • Radiography Testing
  • Ultrasonic Testing
  • Magnetic Particle Testing
  • Liquid Penetrant Testing
  • Developing Welding Procedure Specifications
  • Welder Qualification
  • Destructive Testing
  • Positive Material Identification

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