Special Inspections

ZI Engineering, PC is qualified to perform special inspections in the following areas for class 2 under New York City Department of Building approval:

1704.7 Soils. The special inspections for existing site soil conditions, fill placement and load-bearing requirements shall be performed in accordance with Sections 1704.7.1 through 1704.7.3. The approved soils report, required by Section 1802.2, shall be used to determine compliance.

1704.7.1 Site preparation. Immediately prior to placement of the footings, foundations, fill or other supporting materials the special inspector shall determine that the site has been prepared in accordance with the approved soils report.

1704.7.2 During fill placement. During placement and compaction of the fill material, the special inspector shall determine that the material being used and the maximum lift thickness comply with the approved report, as specified in Section 1803.5.

1704.7.3 Evaluation of in-place density. The special inspector shall determine, at the approved frequency, that the in-place dry density of the compacted fill complies with the approved report.

1704.7.4 Special inspection of soils investigations, borings and test pits. Boring operations shall be subject to continuous special inspection to verify compliance with Section 1802. Soil sample recovery operations for test pits shall be subject to continuous special inspection to verify compliance with Section 1802. Exception: Existing boring, test pit and soil investigation records that have been deemed acceptable to the commissioner in accordance with Section 1802.4.2 are not subject to special inspection.

1704.7.4.1 Boring and /or test pit report. The special inspector’s report shall include statements attesting to the following: that borings were performed in accordance with the procedures established in Section 1802.5, that 50 percent or more of the borings were witnessed directly by the registered design professional designated for this special inspection, the identification of those borings, the name and address of the individual(s) that witnessed any other borings, the borings and/or test pits so inspected were made and carried to the depths indicated; that to the best of the special inspector’s knowledge and belief, the description and classification of the soils are a true description of the samples recovered from the respective borings and/or test pits: that such samples were recovered at the levels indicated; and that the boring and/or test pit work progressed in such manner that the samples recovered are reasonably representative of the subsurface conditions.

1704.8 Pile foundations. A special inspector shall be present when pile foundations are being installed and during tests. The special inspector shall make and submit to the commissioner records of the installation of each pile and results of load tests. Records shall include the cutoff and tip elevation of each pile relative to a permanent reference. A special inspector shall verify that pile installation procedures are in accordance with Section 1808.

1704.9 Pier foundations. Special inspection is required for all pier foundations designed in accordance with Section 1802.2.4. Exception: Piers for support of lightweight fences, recreational equipment, site furnishings and similar construction, unless special inspection is specifically noted as required on the approved construction documents.

1704.9.1 Underpinning operations. Special inspection is required for underpinning operations in accordance with Section 3301.3. See Section 1704.21.

1704.10 Wall panels, curtain walls and veneers. Special inspection is required for exterior architectural wall panels and the anchoring of veneers designed for installation on buildings above a height of 40 feet (12 192 mm). Special inspection of masonry veneer on such structures shall be in accordance with Section 1704.5.

1704.10.1 Special Inspection for wall panels, curtain walls and veneers. The special inspector shall become familiar with and retain a copy of the construction documents, shop drawings, instructions for the sequence of component installation, samples and/or mock-ups, if supplied. The special inspector shall field check the site conditions at the time the structure is prepared for component installation to verify: that the supporting structure is properly aligned and within deign tolerances, that required inserts are properly installed, that framing components are properly sized, aligned, and without structural defects or weakness, that anchors are properly placed, welded, bolted and finished as applicable, that weeps, flashings and tubes are in place and properly drained, that joinery and end dams are properly sealed per plans, that sealing materials with sufficient elongation capability are provided, that gaskets meet specifications, that materials are installed to compensate for horizontal and vertical movement in accordance with the design and the manufacturers guidelines and that any other observations pertinent to safety of performance of the wall system have been performed.

1704.10.2 Unsafe wall conditions. The special inspector shall report any immediate hazards to the department.

1704.11 Sprayed fire-resistant materials. Special inspections for sprayed fire-resistant materials applied to structural elements and decks shall be in accordance with Sections 1704.11.1 through 1704.11.5. Special inspections shall be based on the fire-resistance design as designated in the approved construction documents.

1704.11.1 Structural member surface conditions. The surfaces shall be prepared in accordance with the approved fire-resistance design and the approved manufacturer’s written instructions. The prepared surface of structural members to be sprayed shall be inspected before the application of the sprayed fire-resistant material.

1704.11.2 Application. The substrate shall have a minimum ambient temperature before and after application as specified in the approved manufacturer’s written instructions. The area for application shall be ventilated during and after application as required by the manufacturer’s written instructions.

1704.11.3 Thickness. The average thickness of the sprayed fire-resistant materials applied to structural elements shall not be less than the thickness required by the approved fire-resistant design. Individual measured thickness, which exceeds the thickness specified in a design by ¼ inch (6.4mm) or more, shall be recorded as the thickness specified in the design plus ¼ inch (6.4 mm). For design thicknesses 1 inch (25 mm) or greater, the minimum allowable individual thickness shall be the design thickness minus ¼ inch (6.4 mm). For design thicknesses less than 1 inch (25 mm), the minimum allowable individual thickness shall be the design thickness minus 25 percent. Thickness shall be determined in accordance with ASTM E 605. Samples of the sprayed fire-resistant materials shall be selected in accordance with Sections 1704.11.3.1 and 1704.11.3.2.

1704.11.3.1 Floor, roof and wall assemblies. The thickness of the sprayed fireresistant material applied to floor, roof and wall assemblies shall be determined in accordance with ASTM E 605, taking the average of not less than four measurements for each 1,000 square feet (93 m2) of the sprayed area on each floor or part thereof.

1704.11.3.2 Structural framing members. The thickness of the sprayed fireresistant material applied to structural members shall be determined in accordance with ASTM E 605. Thickness testing shall be performed on not less than 25 percent of the structural members on each floor.

1704.11.4 Density. The density of the sprayed fire-resistant material shall not be less than the density specified in the approved fire-resistant design. Density of the sprayed fire-resistant material shall be determined in accordance with ASTM E 605.

1704.11.5 Bond strength. The cohesive/adhesive bond strength of the cured sprayed fire-resistant material applied to structural elements shall not be less than 150 pounds per square foot (psf) (7.18 kN/m2). The cohesive/adhesive bond strength shall be determined in accordance with the field test specified in ASTM E 736 by testing inplace samples of the sprayed fire-resistant material selected in accordance with Sections 1704.11.5.1 and 1704.11.5.2.

1704.11.5.1 Floor, roof and wall assemblies. The test samples for determining the cohesive/adhesive bond strength of the sprayed fire-resistant materials shall be selected from each floor, roof and wall assembly at the rate of not less than one sample for every 10,000 square feet (929 m2) or part thereof of the sprayed area in each story.

1704.11.5.2 Structural framing members. The test samples for determining the cohesive/adhesive bond strength of the sprayed fire-resistant materials shall be selected from beams, girders, joists, trusses and columns at the rate of not less than one sample for each type of structural framing member for each 10,000 square feet (929 m2) of floor area or part thereof in each story.

1704.11.6 Inspection of existing sprayed fire-resistant materials during alterations in office spaces and spaces classified in occupancy Group B. In office spaces and spaces classified in occupancy Group B, where an alteration exposes any required sprayed fire-resistant materials on structural members or where, pursuant to an alteration, persons are required to enter or access areas in which such sprayed fireresistant materials are capable of being observed, the existing required sprayed fireresistant materials shall be subject to special inspection. Such inspection shall require a determination, based on visual inspection (i) that the existing sprayed fire-resistant materials as originally applied or installed comply with the applicable requirements of this code, including those for installation methods, materials, thickness and coverage; and (ii) that, since their original application, the integrity of the existing sprayed fireresistant materials has not been compromised, damaged or displaced by the current alteration or by any prior alteration or other event.

1704.12 Exterior insulation and finish systems (EIFS). Special inspections shall be required for all EIFS applications installed more than fifteen feet above adjacent finished grades.

1704.12.1 The special inspection shall include verification of: compliance with approved construction documents for attachment to structure, installation of waterproofing membranes, weeps, drains, mold prevention features and conformance with the manufacturers installation guidelines.

1704.13 Special cases. Special inspections shall be required for proposed work that is, in the opinion of the commissioner, unusual in its nature, such as, but not limited to, the following examples: 1. Construction materials and systems that are alternatives to materials and systems prescribed by this code. 2. Unusual design applications of materials described in this code. 3. Materials and systems required to be installed in accordance with additional manufacturer’s instructions that prescribe requirements not contained in this code or in standards referenced by this code.

1704.14 Special inspection for smoke control. Smoke control systems shall be tested by a special inspector in accordance with Section 1704.14.1 and 909.

1704.14.1 Testing scope. The test scope shall be as follows: 1. During erection of ductwork and prior to concealment for the purposes of leakage testing and recording of device location. 2. Prior to occupancy and after sufficient completion for the purposes of pressure difference testing, flow measurements and detection and control verification.

1704.15 Special inspection for mechanical systems. Mechanical systems regulated by the New York City Mechanical Code Sections 107 and 507 and Chapters 10, 11, and 12 shall be inspected for conformance with the approved construction documents.

1704.15.1 Tests for mechanical systems. Tests of mechanical systems shall be performed in accordance with New York City Mechanical Code Sections 507.16, 1011, 1108 and 1208. Exception: Listed and labeled self contained factory built equipment and appliances deemed to meet the design, manufacture and factory test requirements of this code shall be field tested in accordance with their manufacturers installation and operational test standards.

1704.15.2 Special Inspection of Mechanical Systems. Inspections of mechanical systems shall include the following as applicable to the system: 1. Visual certification that required components of such systems are complete in accordance with the manufacturers installation guidelines and the approved construction documents, 2. Supports, hangers, seismic bracing, and vibration isolation equipment are properly spaced and anchored to supporting structure, 3. Installation of required signage and safety instructions, 4. Electrical components are installed and electrical sign-off issued, 5. Ventilation balancing report is complete and in accordance with design documents, 6. Required labeling, operational instructions and safety signage properly posted, 7. All related special inspections for such systems are complete, 8. Noise producing mechanical equipment located within 100 feet (30 480 mm) of habitable room windows shall be tested at the equipment for compliance with the design STC rating of the equipment, 9. Required fire and smoke dampers are installed and functioning properly. Exception: Systems and equipment exempt from service equipment certificate of compliance in accordance with Section 109.3.8.2.1. 1704.16 Special inspection for fuel storage and fuel piping systems. Fuel oil storage equipment including tanks, pumps, valves, including transfer, return, fill and vent piping, hangers and bracing, fill and vent terminals, and related systems regulated by the New York City Mechanical Code Sections 1308, shall be inspected for conformance with the approved construction documents and the manufacturer’s installation standards. Testing of fuel storage tanks and piping shall be performed in accordance with New York City Mechanical Code Section 1308.1. Exceptions: 1. Testing for listed fuel oil storage tanks 660 gallons (2498 L) or less in capacity, supplied with a label or manufacturer’s certification attesting that the tank was factory tested to a testing standard indicated in New York City Mechanical Code Section 1308.1. 2. Systems and equipment exempt from service equipment certificate of compliance in accordance with Section 109.3.8.2.3.

1704.19 Structural safety during construction operations. Construction work consisting of structural alterations, excavation, underpinning, and demolition work that requires “design” as defined in Chapter 33, including: earth shoring, underpinning, protection of adjacent structures and buildings, shall be subject to special inspection in accordance with this section. All alterations to existing structures in which loads are transferred from one structural system of structural elements to another, such as installation of columns or girders, replacement of existing bearing walls, the creation of openings or slots in existing walls, girders or floors, alteration of arches, rigid frames, trusses in frame buildings, or where the stability or integrity of a structural system is to be temporarily diminished shall be subject to special inspections in accordance with this section. Exception: Construction operations not requiring “design” as defined in Chapter 33. 1704.19.1 General. Prior to commencement of work, the special inspector shall review the contractor’s proposed sequence of operations and determine the areas of work that require design. A written statement shall be prepared, mutually acceptable to the contractor and the special inspector, indicating: 1. The portions of work requiring design as defined in Chapter 33. 2. The names and addresses of the licensed professionals that have been engaged to supply design documents for applicable work. 3. The approximate dates for delivery of design documents. 4. A schedule of periodic special inspections, at agreed intervals, including adequate frequency to assure the contractor’s continued compliance with the proposed designs and sequence of construction operations.

1704.19.2 Site structural safety design documents. Design documents including: shop drawings, sketches and written descriptions of proposed work regarding site structural safety in construction operations shall be prepared by a registered design professional in the employ of the owner or the contractor. Such designs may be revised at any time by the registered design professional. Copies of the special inspection log book, the design documents and revisions thereof, shall be maintained at the jobsite, and at the office of the special inspector, available for use and review at all reasonable times, until the structural work is complete. In the case of alteration to existing structures, the design documents shall be reviewed by the registered design professional of record.

1704.19.3 Inspection for structural safety in construction operations. The special inspector shall visit the jobsite at agreed intervals, assess the ongoing work and verify that operations conform with the design documents. Deficiencies shall be reported as required by Section 1704.2. In the event unsafe conditions are discovered, the commissioner and the registered design professional employed by the contractor shall be immediately notified.

1704.19.4 Records of structural safety inspections in construction operations. The special inspection logbook shall be maintained at the special inspector’s office and shall contain the following information: 1. Project identification, application number and address. 2. Date and time of each inspection. 3. Names of personnel who performed each inspection. 4. Dates of off-site meetings, names of the participants and a summary of the conversations. 5. Any significant observations or instructions given related to any of the following: 5.1. Deviations from the design documents. 5.2. Anticipated field conditions. 5.3. Proper execution of the work. 5.4. Safe jobsite conditions. 5.5. Precautions taken to maintain safe conditions, if work is stopped for any reason.

1704.19.5 Special requirements for work in occupied multiple dwellings. When alteration or construction operations are performed at occupied multiple dwellings, the special inspector shall periodically verify compliance with a Tenant Protection Plan as provided for in Chapter 1 of Title 28 of the Administrative Code.

1704.20 Site storm drainage disposal and detention facilities. Storm water detention facilities, roof retention facilities and dry-well systems shall be inspected for conformance with the approved construction documents. Minor variations, based on actual site conditions shall be acceptable at the discretion of the registered design professional of record. Verification shall include: 1. Materials of construction. 2. Bedding of pipe and facilities. 3. Placement and installation of fill materials. 4. Volume of drywell and detention facilities. 5. Installation of volume flow control devices. 6. Workmanship and quality of installation. 7. Overall conformance with the approved construction documents. Hydrostatic testing of the detention system shall be required when the system is designed as watertight.

1704.20.1 Soil percolation tests. Soil percolation tests shall be performed at the site of a proposed individual on-site private sewage disposal system installation to determine the suitability of the soil and site. Such test shall be performed under the supervision of a special inspector. The results of the percolation tests shall be filed on forms provided by the department, stating the suitability of the site and the capacity of the subsoil for the proposed use. The registered design professional of record for the dry-well system shall be notified immediately if the results of the percolation test demonstrate that the approved system may not function as designed.

1704.21 Sprinkler system special inspection. New and altered sprinkler system shall be inspected in accordance with Section 903. The permit holder responsible for the sprinkler work shall perform all required acceptance tests, complete and sign the appropriate contractor’s material and test certifications. The special inspector shall witness all required tests, and shall verify that all installations of all materials, fittings, hangers, assemblies and signage are in accordance with the approved construction documents and that the contractor has transmitted required maintenance literature and instruction to the owner. The special inspector shall verify that the material and test certification forms have been transmitted to the Fire Department and the department. Exception: Special inspection of the hydrostatic test shall not be required when such test is witnessed by the department.

1704.22 Standpipe system special inspection. New and altered standpipe systems shall be inspected in accordance with Section 905 The permit holder responsible for the standpipe work shall perform all required acceptance tests, complete and sign the appropriate contractor’s material and test certifications. The special inspector shall witness all required tests, verify that installation of all materials, fittings, hangers, assemblies and signage are in accordance with the approved construction documents and that the contractor has transmitted required maintenance literature and instruction to the owner. The special inspector shall verify that the material and test certification forms have been transmitted to the Fire Department and the department. Exception: Special inspection of the hydrostatic test shall not be required when such test is witnessed by the department.

1704.23 Heating systems. Special Inspection shall be required for new and altered boilers and heating systems. All boilers and heating systems, including chimney connectors, shall be inspected for compliance with the approved construction documents. New heating systems shall be tested in accordance with New York City Mechanical Code Section 1011. Alterations to heating systems shall be subjected to applicable tests for the altered portions of the system and to verification of its satisfactory operation within the existing system. Exception: Tests and inspections need not duplicate any tests or inspections previously certified by the commissioner or a duly authorized insurance company.

1704.24 Chimneys. New and altered chimneys shall be subject to special inspection. The chimney shall be inspected to verify compliance with the approved construction documents, and proper clearance or isolation from adjacent combustible construction. Testing of the chimney shall be performed in accordance with Section 810 of the New York City Mechanical Code. Exception: A pressurized smoke test need not be performed on an existing negative pressure chimney if the lining of such chimney is not affected by alterations and the registered design professional specifies on the approved construction documents that such test need not be performed on such chimney.

1704.25 Through-penetration firestop systems, concealed draftstop and fireblock systems. All through-penetration firestopping, draftstopping and fireblocking shall be subject to periodic special inspection prior to concealment to determine compliance with the approved construction documents. Listed systems shall be inspected for compliance with their listing. Exception: Through-penetration firestop systems may be inspected in accordance with ASTM E2174-04 when authorized by the registered design professional of record and when the contractor applies the procedures established in that standard.

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