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MASONRY

Municipal Code of Chicago tit. 14B, ch. 14B-21
in effect

Municipal Code of Chicago § 14B-21-2100 Defined terms.

14B-21-2100 Defined terms. Where provisions of Chapter 21 of IBC are adopted by reference, the following terms shall be reset in italic type: "AAC masonry"; "adhered masonry veneer"; "bed joint"; "chimney"; "fireplace"; "fireplace throat"; "fire-resistance rating"; "hollow masonry unit"; "masonry unit"; "mortar"; "solid masonry unit"; "stone masonry"; "structural clay tile"; "surface-bonding mortar" and "wythe."

Municipal Code of Chicago § 14B-21-2101 General.

14B-21-2101 General. The provisions of Section 2101 of IBC are adopted by reference with the following modification: 1. Add new Section 2101.2.2 to read: "2101.2.2 Single-wythe exterior walls. Masonry units used in single-wythe exterior walls of buildings containing a Group R occupancy shall be tested in accordance with ASTM E514 and shall have integral water repellant included in the manufacturing process. Exception: Grade SW clay or shale masonry units. Mortar used in single-wythe exterior walls of buildings containing a Group R occupancy shall have a compatible water repellant added to the mixture." (Amend Coun. J. 10-7-20, p. 21791, Art. II, § 30)

Municipal Code of Chicago § 14B-21-2103 Masonry construction materials.

14B-21-2103 Masonry construction materials. The provisions of Section 2103 of IBC are adopted by reference with the following modifications: 1. Revise Section 2103.1, excluding the exception, to read: "2103.1 Masonry units. Concrete masonry units, clay or shale masonry units, stone masonry units, glass unit masonry and AAC masonry units shall comply with Article 2.3 of TMS 602. Architectural cast stone shall conform to ASTM C1364 and TMS 504. Calcium silicate-based masonry units shall conform to ASTM C73 or C744. Adhered manufactured stone masonry veneer units shall conform to ASTM C1670." 2. Add a new exception following Section 2103.1.1 to read: "Exception: Undamaged masonry units may be reused on the same site for the same purpose without needing to conform to the requirements for new masonry units."

Municipal Code of Chicago § 14B-21-2104 Construction.

14B-21-2104 Construction. The provisions of Section 2104 of IBC are adopted by reference with the following modification: 1. Revise the last sentence of Section 2104.1.2 to read: "Terra cotta and metal cornices shall be anchored to a structural frame of noncombustible material."

Municipal Code of Chicago § 14B-21-2105 Quality assurance.

14B-21-2105 Quality assurance. The provisions of Section 2105 of IBC are adopted by reference with the following modification: 1. Revise Section 2105.1 by replacing "approved" with "permitted."

Municipal Code of Chicago § 14B-21-2110 Glass unit masonry.

14B-21-2110 Glass unit masonry. The provisions of Section 2110 of IBC are adopted by reference with the following modification: 1. Revise Section 2110.1.1, excluding the exception, to read: "2110.1.1 Limitations. Solid or hollow glass block shall not be used in fire walls, party walls, fire barriers, fire partitions or smoke barriers, or for load-bearing construction. Glass blocks shall be erected with mortar and reinforcement in metal channel-type frames, structural frames, masonry or concrete recesses, embedded panel anchors as provided for both exterior and interior walls or other approved joint materials. Wood strip framing shall not be used in walls required to have a fire-resistance rating by other provisions of this code."

Municipal Code of Chicago § 14B-21-2111 Masonry fireplaces.

14B-21-2111 Masonry fireplaces. The provisions of Section 2111 of IBC are adopted by reference with the following modifications: 1. Delete the last sentence of Section 2111.3. 2. Delete the last sentence of Section 2111.4. 3. Revise Section 2111.14.3 to read: "2111.14.3 Exterior air intake. The exterior air intake shall be capable of providing all combustion air from the exterior of the building. The exterior air intake shall not be located within a garage, attic, basement or crawl space nor shall the air intake be located at an elevation higher than the firebox. The exterior air intake shall be covered with a corrosion-resistant screen of 1/4-inch (6.4 mm) mesh."

Municipal Code of Chicago § 14B-21-2112 Masonry heaters.

14B-21-2112 Masonry heaters. The provisions of Section 2112 of IBC are adopted by reference with the following modification: 1. Revise Section 2112.4 by replacing "Seismic Design Category D, E or F" with "Seismic Design Category D."

Municipal Code of Chicago § 14B-21-2113 Masonry chimneys.

14B-21-2113 Masonry chimneys. The provisions of Section 2113 of IBC are adopted by reference with the following modifications: 1. Delete the last sentence of Section 2113.3. 2. Revise Section 2113.5 to read: "2113.5 Corbeling. Masonry chimneys shall not be corbeled more than half of the chimney’s wall thickness from a wall or foundation, nor shall a chimney be corbeled from a wall or foundation that is less than 12 inches (305 mm) in thickness unless it projects equally on each side of the wall, except that on the second story of a two-story building of Group R-5 occupancy, corbeling of chimneys on the exterior of the enclosing walls is permitted to equal the wall thickness. The projection of a single course shall not exceed one-half the unit height or one-third of the unit bed depth, whichever is less." 3. Revise Section 2113.7 to read: "2113.7 Offsets. Where a masonry chimney is constructed with a fireclay flue liner surrounded by one wythe of masonry, the maximum offset shall be such that the centerline of the flue above the offset does not extend beyond the center of the chimney wall below the offset. Where the chimney offset is supported by masonry below the offset in accordance with accepted engineering practices, the maximum offset limitations shall not apply. Each individual corbeled masonry course of the offset shall not exceed the projection limitations specified in Section 2113.5." 4. Revise Section 2113.11.1.4 to read: "2113.11.1.4 Oil-fired appliances listed for use with L-vent. Flue lining and vent systems for use in masonry chimneys with oil-fired appliances listed for use with Type L vent shall be limited to flue lining systems complying with Section 2113.11.1 and listed chimney liners complying with UL 641 (see Section 2113.11.1.5 for marking)." 5. Revise Section 2113.11.2.2 by deleting "an approved." 6. Revise Section 2113.11.3.2 by deleting "an approved." 7. Revise Section 2113.11.3.4 by deleting "approved."
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2667229Fetched: 10/24/2026

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