Twin Peaks Testing > Services > Special and Progress Inspections

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Property Inspection Services

Full Compliance Of Your Construction Projects

TwinPeaks Special Inspections Agency License and Certification

TPI is a NYC DOB Class I Special Inspection 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’s accredited in accordance with the International Standard Organization requirements for the operation of various types of bodies performing inspection 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 requirements of ASTM E 543 and are outlined in TPI’s written procedures, which were audited and approved by a certified ASNT NDT Level III professional. All work performed by Twin Peaks, Inc. and its subconsultants will follow these established quality procedures and requirements.

Special Inspections Services Experience Of Twinpeaks

Twin Peaks Inc. has been pioneering in special inspection in New York City and Tri-State areas since 1992. We draw on the strength of our pool of experienced and certified inspectors.Our engineers and project managers have an average 15-20 years of experience in the field, with concentrations in structural concrete, masonry, and steel, Geotechnical and SOE, Mechanical, Energy Code, and Life Safety Systems, many more. 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.

How We Work and Quality Assurance Promise

Special inspections are required to verify the quality of methods and materials used in construction. Where some inspectors are content to deliver the minimum services required, we at TPI apply our knowledge of the building code and the industry to manage the complexities of quality assurance, maintaining a high standard of quality for our clients and make the process as streamlined and simple as possible.

Our Project Managers help demystify the QA process and show clients how to make it best enhance their goals. TPI monitors compliance at each stage of construction and immediately notifies clients of issue to enable the swift resolution necessary to keep projects on schedule and under budget.

TPI provides objective verification that our clients’ projects are delivered as required by the building code, as designed by the Architects and Engineers of Record, and with the quality materials and methods specified in their plans. Our approach combines the large pool of manpower and resources of a large company with the focused, client-centered approach that has secured us repeat business from clients since 1992.

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
  • ChimneysFire-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 & Fill-in-place Density
  • Density
  • Spray Fire Resistant Materials
  • Fire Resistant Penetrations & 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
  • Smith 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

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