As defined by the NYC Building code structural stability of the existing building is
“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, where the stability or integrity of a structural system is to be temporarily diminished, or where otherwise required by the commissioner, shall be subject to special inspections in accordance with Sections 1704.20.6 through 1704.20.10 of Chapter 17 of NYC Building code”
Excerpts from the NYC Building Code regarding Structural stability inspection
1704.20.6 Inspection program.
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 documents in accordance with Section 1704.20.7.
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. At a minimum, the site must be inspected twice, once at a pre-construction meeting with the contractor and once during construction operations.
1704.20.7 Design documents.
Design documents, including shop drawings, sketches and written descriptions of proposed work regarding structural stability 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 job site, and at the office of the special inspector, available for use and review at all reasonable times, until the work subject to special inspection is complete. In the case of alteration to existing structures, the structural stability design documents shall be reviewed by the registered design professional of record.
1704.20.7.1 Monitoring.
The design documents shall include any requirements for monitoring of the subject structure and/or adjacent structures, as determined by the registered design professional responsible for the design. The monitoring plan shall be specific to the buildings to be monitored and operations to be undertaken, and shall specify the scope and frequency of monitoring, acceptable tolerances, and reporting criteria for when tolerances are exceeded.
1704.20.8 Inspection during 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 1704.1.2. In the event unsafe conditions are discovered, the commissioner and the registered design professional employed by the contractor shall be immediately notified by the special inspector.
1704.20.9 Records of special inspections.
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 are taken to maintain safe conditions, if work is stopped for any reason.
1704.20.10 Special requirements for work in occupied multiple dwellings.
[Repealed](Repealed L.L. 2017/154, 8/30/2017, eff. 12/28/2017)
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