N.Y.C. Admin. Code § EBC A103: Section EBC A103: Parapets and Chimneys

A103.1 Parapet and Chimney heights.

The maximum height of an unbraced unreinforced masonry parapet or chimney above the lower of either the level of anchors or the roof sheathing shall not exceed 3.0 times its thickness. Other ratios may be used if justified by a registered design professional. Parapets and chimneys not conforming to this chapter shall be removed, reduced in height if allowed, stabilized, strengthened, or laterally braced to ensure that the parapets and chimneys remain in their original positions and conform to this chapter.

A103.2 Lateral bracing.

If the parapet or chimney height exceeds the allowed maximum, and new lateral bracing is chosen as a remedy, then the lateral bracing system shall be as shown in Figures A1-4 through A1-6 as applicable. A registered design professional can provide alternative bracing details for loads conforming to the New York City Building Code. Parapet and chimney corrective work is to be performed in conjunction with the installation of roof connections.

A103.3 Existing coping connections.

The stability and strength of connections of parapet and chimney copings shall be evaluated by a registered design professional.

Figure A1-1 Schematic Typical Wall Tieback Detail - Type 1

Figure A1-2 Schematic Typical Wall Tieback Detail - Type 2

Figure A1-3 Schematic Typical Wall Tieback Detail - Type 2

Figure A1-4 Schematic Parapet Bracing Detail

Figure A1-5 Schematic Chimney Bracing Details

Figure A1-6 Schematic Chimney Bracing Details