For AI agents: read the machine-readable documentation index at /llms.txt or the single-file full reference at /llms-full.txt.
Form a Business

GYPSUM BOARD, GYPSUM PANEL PRODUCTS AND PLASTER

Municipal Code of Chicago tit. 14B, ch. 14B-25
in effect

Municipal Code of Chicago § 14B-25-2500 Defined terms.

14B-25-2500 Defined terms. Where provisions of Chapter 25 of IBC are adopted by reference, the following terms shall be reset in italic type: "cement plaster"; "exterior surfaces"; "gypsum board"; "gypsum panel products"; "gypsum plaster"; "gypsum veneer plaster"; "interior surfaces" and "wire backing."

Municipal Code of Chicago § 14B-25-2501 General.

14B-25-2501 General. The provisions of Section 2501 of IBC are adopted by reference with the following modification: 1. Revise Section 2501.2 to read: "2501.2 Other materials. Other wall or ceiling coverings may be approved by the building official and, if so, shall be installed in accordance with the recommendations of the manufacturer and the conditions of approval."

Municipal Code of Chicago § 14B-25-2502 Performance.

14B-25-2502 Performance. The provisions of Section 2502 of IBC are adopted by reference with the following modification: 1. Revise Section 2502.1 by adding the following at the end: "Where walls or ceiling coverings of gypsum materials will be permanently or periodically exposed to the exterior conditions, they must be designed for exterior exposure."

Municipal Code of Chicago § 14B-25-2504 Vertical and horizontal assemblies.

14B-25-2504 Vertical and horizontal assemblies. The provisions of Section 2504 of IBC are adopted by reference without modification.

Municipal Code of Chicago § 14B-25-2506 Gypsum board and gypsum panel product materials.

14B-25-2506 Gypsum board and gypsum panel product materials. The provisions of Section 2506 of IBC are adopted by reference with the following modifications: 1. Revise Table 2506.2 by inserting a row to read: "Abuse-resistant gypsum panel products | ASTM C1629" 2. Delete Section 2506.2.1.

Municipal Code of Chicago § 14B-25-2508 Gypsum construction.

14B-25-2508 Gypsum construction. The provisions of Section 2508 of IBC are adopted by reference with the following modifications: 1. Revise Section 2508.4 to read: "2508.4 Adhesives. Gypsum board and gypsum panel products secured to framing with adhesives in ceiling assemblies shall be attached using the fastening schedule recommended by the manufacturer. Expandable foam adhesives for fastening gypsum wallboard shall conform to ASTM D6464. Other adhesives for the installation of gypsum wallboard shall conform to ASTM C557." 2. Revise note b to Table 2508.6 to read: "Values shall be reduced 50 percent in Seismic Design Category D."

Municipal Code of Chicago § 14B-25-2509 Wet areas.

14B-25-2509 Wet areas. The provisions of Section 2509 of IBC are adopted by reference with the following modifications: 1. Revise Section 2509.1 to read: "2509.1 Finish materials. Shower areas, bathing areas and public toilet walls shall conform to Section 1209.2." 2. Revise Table 2509.2 by adding a row to read: "Fiber-reinforced gypsum panels | ASTM C1278"

Municipal Code of Chicago § 14B-25-2510 Lathing and furring for cement plaster (stucco).

14B-25-2510 Lathing and furring for cement plaster (stucco). The provisions of Section 2510 of IBC are adopted by reference with the following modifications: 1. Delete exception 2 to Section 2510.6. 2. Revise Section 2510.7 by deleting "approved."

Municipal Code of Chicago § 14B-25-2511 Interior plaster.

14B-25-2511 Interior plaster. The provisions of Section 2511 of IBC are adopted by reference with the following modifications: 1. Revise the exception to Section 2511.1 to read: "Exception: Gypsum veneer plaster and cement plaster specifically designed and recommended by the manufacturer for one-coat applications." 2. Revise the first two sentences of Section 2511.4 to read: "Condition of surfaces shall be as specified in Section 2510.7. Specially prepared gypsum plaster designed for application to concrete surfaces or acoustical plaster shall be permitted." 3. Revise Section 2511.5 by replacing "an approved" with "a." (Amend Coun. J. 2-19-20, p. 14473, Art. II, § 87)

Municipal Code of Chicago § 14B-25-2512 Exterior plaster.

14B-25-2512 Exterior plaster. The provisions of Section 2512 of IBC are adopted by reference with the following modifications: 1. Revise the first sentence of Section 2512.2 to read: "Only plasticity agents in amounts recommended by the manufacturer shall be added to Portland cement or blended cements." 2. Add an exception to Section 2512.9 to read: "Exception: Acrylic-based or siliconized acrylic-based finish coat systems manufactured for application as a finish coat over Portland cement based exterior stucco or plaster assemblies shall be allowed as a finish coat."

Municipal Code of Chicago § 14B-25-2513 Exposed aggregate plaster.

14B-25-2513 Exposed aggregate plaster. The provisions of Section 2513 of IBC are adopted by reference with the following modification: 1. Revise the first sentence of Section 2513.3 to read: "The bedding coat for interior surfaces or exterior surfaces shall be composed of one part Portland cement and one part Type S lime; or one part blended cement and one part Type S lime; or masonry cement; or plastic cement and not more than three parts of graded white or natural sand by volume."
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2667600Fetched: 10/24/2026

Starting a business in Illinois? Illinois LLC guide: costs and requirements