As per the NYC DOB Building code section BC 1704.5 under the Concrete construction section. This section provides guidelines on how to perform the Masonry Masonry construction shall be inspected and verified in accordance with the requirements of Sections 1704.5.1 through 1704.5.3, depending on the structural occupancy category of the building or structure. Please read the table below which outlines all the required items to perform this inspections shall not be required for:1.Masonry fireplaces, masonry heaters, or masonry chimneys installed or constructed in accordance with Section 2111, 2112, or 2113, respectively.
2- Alterations to existing masonry, where the quantity of replaced masonry is less than 10 square feet (0.93 m2) in any 100 square feet (9.3 m2) of wall area when specifically exempted on the approved construction document.
1704.5.1 Empirically designed masonry, glass unit masonry, and masonry veneer in buildings in structural occupancy category IV. The minimum inspection program for empirically designed masonry, glass unit masonry, and masonry veneer (designed by Section 2109,2110, or chapter 14, respectively, or by Chapter 5,6 or7 ofTMS402/ACI 530/ASCE 5), in structures classified as structural occupancy category IV,( in accordance with table 1604.5), shall comply with Table 1704.5.1.
1704.5.2 Masonry in buildings less than three stories in height in structural occupancy category I, II, or III. The minimum special inspection program for structures classified as structural occupancy categories I, II, or III, in accordance with Table 1604.5, which are three stories or less in height, shall comply with Table 1704.5.1.
1704.5.3 Masonry in buildings three stories or more in height, and engineered masonry in structural occupancy category IV. The minimum special inspection program for masonry designed by Section 2107 or 2108, or by chapters other than Chapters 5, 6 or 7 of TMS 402/ACI 530/ASCE 5, in structures classified as structural occupancy category IV, in accordance with Table 1604.5, and masonry in buildings more than three stories in height, shall comply with Table 1704.5.3
Alterations to existing masonry walls where the quantity of masonry involved in any one given location does not exceed 50 contiguous square feet (4.64 m2) shall be permitted to be subject to level 1 special inspection in accordance with Table 1704.5.1 when specifically identified as such on the approved construction documents by the registered design professional of record.