WOOD

Municipal Code of Chicago tit. 14B, ch. 14B-23

in effect

Municipal Code of Chicago § 14B-23-2300 Defined terms.

14B-23-2300 Defined terms. Where provisions of Chapter 23 of IBC are adopted by reference, the following terms shall be reset in italic type: "accreditation body"; "braced wall line"; "braced wall panel"; "cripple wall"; "diaphragm"; "drag strut"; engineered wood rim board"; "fiberboard"; "gable"; "hardboard"; "hold-down"; "naturally durable wood"; "particleboard"; "performance category"; "prefabricated wood I-joist"; "risk category"; "structural composite lumber"; "tie-down" and "wood structural panel."

Municipal Code of Chicago § 14B-23-2301 General.

14B-23-2301 General. The provisions of Section 2301 of IBC are adopted by reference without modification.

Municipal Code of Chicago § 14B-23-2302 Design requirements.

14B-23-2302 Design requirements. The provisions of Section 2302 of IBC are adopted by reference without modification.

Municipal Code of Chicago § 14B-23-2303 Minimum standards and quality.

14B-23-2303 Minimum standards and quality. The provisions of Section 2303 of IBC are adopted by reference with the following modifications: 1. Revise Section 2303.1.1 and its subsections to read: "2303.1.1 Sawn lumber. Sawn lumber used for load-supporting purposes, including end-jointed or edge-glued lumber, machine stress- rated or machine-evaluated lumber, shall be identified by the grade mark of a lumber grading or inspection agency accredited by an accreditation body that complies with DOC PS 20 or approved equivalent. Grading practices and identification shall comply with rules published by an agency certified in accordance with the procedures of DOC PS 20 or approved equivalent procedures. 2303.1.1.1 Certificate of inspection. In lieu of a grade mark on the material, a certificate of inspection as to species and grade issued by a lumber grading or inspection agency meeting the requirements of this section shall be accepted for precut, remanufactured or rough-sawn lumber and for sizes larger than 3 inches (76 mm) nominal thickness. 2303.1.1.2 End-jointed lumber. Where approved for use, end-jointed lumber may be used interchangeably with solid-sawn members of the same species and grade. End-jointed lumber used in an assembly required to have a fire-resistance rating shall have the designation "Heat Resistant Adhesive" or "HRA" included in its grade mark." 2. Revise Section 2303.1.3 to read: "2303.1.3 Structural glued-laminated timber. Structural glued-laminated timbers shall be manufactured and identified as required in ANSI/AITC A 190.1 and ASTM D3737." 3. Revise Section 2303.1.4 to read: "2303.1.4 Structural glued cross-laminated timber. Where approved for use, cross-laminated timber shall be manufactured and identified in accordance with ANSI/APA PRG 320." 4. Revise Section 2303.1.5 to read: "2303.1.5 Wood structural panels. Wood structural panels, where used structurally (including those used for siding, roof and wall sheathing, subflooring, diaphragms and built-up members), shall conform to the requirements for their type in DOC PS 1, DOC PS 2 or ANSI/APA PRP 210. Each panel or member shall be identified for grade, bond classification, and Performance Category by the trademarks of an approved agency. The Performance Category value shall be used as the "nominal panel thickness" or "panel thickness" whenever referenced in this code. Wood structural panel components shall be designed and fabricated in accordance with the applicable standards listed in Section 2306.1 and identified by the trademarks of an approved agency indicating conformance to the applicable standard. In addition, wood structural panels where permanently exposed in outdoor applications shall be of exterior type, except that wood structural panel roof sheathing exposed to the outdoors on the underside is permitted to be Exposure 1 type." 5. Revise Section 2303.1.6.2 by replacing "an approved roof covering" with "a roof covering." 5.1. Revise Section 2303.1.6.3 by replacing "an approved" with "a". 6. Delete Section 2303.1.6.3.1. 7. Revise Section 2303.1.11 to read: "2303.1.11 Structural log members. Stress grading of structural log members of nonrectangular shape, as typically used in log buildings, shall be in accordance with ASTM D3957. Such structural log members shall be identified by the grade mark of an approved agency. In lieu of a grade mark on the material, a certificate of inspection as to species and grade issued by a lumber grading or inspection agency meeting the requirements of this section shall be permitted." 8. Revise Section 2303.2.2 by replacing "approved" with "acceptable." 9. Revise Section 2303.2.5 by replacing "an approved method" with "a method." 10. Revise Section 2303.2.9 to read: "2303.2.9 Type I and II construction applications. See Section 603.1 for allowed uses of fire-retardant-treated wood in buildings of Type I or II construction." 11. Revise the first sentence of Section 2303.4.1.1 to read: "The written, graphic and pictorial depiction of each individual truss shall be provided to the registered design professional in responsible charge for approval prior to installation." 12. Delete Section 2303.4.1.4 and its subsections. 13. Revise Section 2303.4.6 by deleting the last sentence. (Amend Coun. J. 2-19-20, p. 14473, Art. II, § 83)

Municipal Code of Chicago § 14B-23-2304 General construction requirements.

14B-23-2304 General construction requirements. The provisions of Section 2304 of IBC are adopted by reference with the following modifications: 1. Revise note c to Table 2304.8(3) to delete "approved." 2. Revise note a to Table 2304.8(4) to delete "approved." 3. Delete Section 2304.10.5.2. 4. Revise Section 2304.10.6 to delete "approved." 5. Revise note b to Table 2304.11 to delete "approved." 6. Revise the first two sentences of Section 2304.11.1.1 to read: "Minimum dimensions of columns shall be in accordance with Table 2304.11. Columns shall be continuous or superimposed throughout all stories." 7. Revise Section 2304.11.1.2 to read: "2304.11.1.2 Floor framing. Minimum dimensions of floor framing shall be in accordance with Table 2304.11. Wall plate boxes or hangers shall be provided where wood beams, girders or trusses rest on masonry or concrete walls. Where intermediate beams are used to support a floor, they shall rest on top of girders, or shall be supported by a metal hanger into which the ends of the beams shall be closely fitted. Where traditional heavy timber detailing is used, these connections shall be permitted to be supported by ledgers or blocks securely fastened to the sides of the girders." 8. Delete Section 2304.11.2.1. 9. Revise Section 2304.11.3.1 to read: "2304.11.3.1 Cross-laminated timber floors. Where approved for use, cross-laminated timber floors shall comply with this section. Cross-laminated timber floors shall be not less than 4 inches (102 mm) in actual thickness. Cross-laminated timber floors shall be continuous from support to support and individual panels shall be mechanically fastened to one another. Cross- laminated timber floors shall be permitted to be connected to walls without a shrinkage gap providing swelling or shrinking is considered in the design. Corbelling of masonry walls under the floor shall be permitted to be used." 10. Revise Section 2304.11.4 to replace "approved hardware" with "other approved hardware." 11. Revise Section 2304.11.4.1 to read: "2304.11.4.1 Cross-laminated timber roofs. Where approved for use, cross-laminated timber roofs shall comply with this section. Cross-laminated timber roofs shall be not less than 3 inches (76 mm) in actual thickness, and shall be continuous from support to support. Individual panels shall be mechanically fastened to one another." 12. Revise Sections 2304.12.1.1, 2304.12.1.2, 2304.12.1.3, 2304.12.1.4 and 2304.12.1.5 to replace "naturally durable or preservative-treated wood" with "naturally durable wood or preservative-treated wood." 13. Revise Sections 2304.12.2.1, 2304.12.2.2, 2304.12.2.3, 2304.12.2.4 and 2304.12.2.5 to replace "naturally durable or preservative-treated wood" with "naturally durable wood or preservative-treated wood." 14. Delete the exception to Section 2304.12.2.3. 15. Revise Section 2304.12.3, excluding the exception, to read: "2304.12.3 Wood in contact with the ground or fresh water. Wood used in contact with exposed earth shall be naturally durable wood for both decay and termite resistance or preservative treated wood in accordance with AWPA U1 for soil or fresh water use." 16. Delete Section 2304.12.4.

Municipal Code of Chicago § 14B-23-2305 General design requirements for lateral force-resisting systems.

14B-23-2305 General design requirements for lateral force-resisting systems. The provisions of Section 2305 of IBC are adopted by reference with the following modification: 1. Revise Section 2305.2 by replacing "approved method" with "accepted engineering practice."

Municipal Code of Chicago § 14B-23-2306 Allowable stress design.

14B-23-2306 Allowable stress design. The provisions of Section 2306 of IBC are adopted by reference with the following modifications: 1. Revise Section 2306.1.3 by replacing "an approved method" with "a method." 2. Revise note g to Table 2306.3(1) by replacing "Seismic Design Category D, E or F" with "Seismic Design Category D." 3. Revise note e to Table 2306.3(2) by replacing "Seismic Design Category D, E or F" with "Seismic Design Category D."

Municipal Code of Chicago § 14B-23-2307 Load and resistance factor design.

14B-23-2307 Load and resistance factor design. The provisions of Section 2307 of IBC are adopted by reference without modification.

Municipal Code of Chicago § 14B-23-2308 Conventional light-frame construction.

14B-23-2308 Conventional light-frame construction. The provisions of Section 2308 of IBC are adopted by reference with the following modifications: 1. Delete the last sentence of Section 2308.1. 2. Revise Table 2308.2.1 to read: TABLE 2308.2.1 ALLOWABLE STORY HEIGHT SEISMIC DESIGN CATEGORY | ALLOWABLE STORIES ABOVE GRADE PLANE a A or B | Three stories C | One story a. Where cripple walls exceed 14 inches (356 mm) in height, the allowable number of stories above grade plane shall be reduced by one. 2.1. Revise Section 2308.2.3 by deleting item 3. 3. Delete Section 2308.2.4. 4. Revise Section 2308.2.6 by deleting "assigned to Seismic Design Category B, C, D or F." 5. Revise Section 2308.3.1 by replacing "approved anchors" with "other anchors." 6. Delete Section 2308.3.1.1. 7. Delete Section 2308.3.1.2. 8. Revise Table 2308.4.1.1(1) by deleting the columns for snow loads of 50 psf and 70 psf and the heading rows "GROUND SNOW LOAD (psf)" and "30". 8.1. Revise note d to Table 2308.4.1.1(1) by replacing "an approved framing anchor" with "a framing anchor." 8.2. Delete note e to Table 2308.4.1.1(1). 9. Revise note d to Table 2308.4.1.1(2) by replacing "an approved framing anchor" with "a framing anchor." 9.1. Delete Table 2308.4.2.1(1). 10. Revise Section 2308.4.2.3 by deleting "in an approved manner." 11. Revise Section 2308.4.4.1 to read: "2308.4.4.1 Openings in floor diaphragms in Seismic Design Category B or C. Openings in horizontal diaphragms in Seismic Design Category B or C with a dimension that is greater than 4 feet (1219 mm) shall be constructed with metal ties and blocking in accordance with this section and Figure 2308.4.4.1(1). Metal ties shall be not less than 0.058 inch [1.47 mm (16 galvanized gage)] in thickness by 1 1/2 inches (38 mm) in width and shall have a yield stress not less than 33,000 psi (227 Mpa). Blocking shall extend not less than the dimension of the opening in the direction of the tie and blocking. Ties shall be attached to blocking in accordance with the manufacturer's instructions but with not less than eight 16d common nails on each side of the header-joist intersection." 12. Delete Section 2308.4.4.2 and its exception. 13. Delete Section 2308.4.10. 14. Revise the first two sentences of Section 2308.5.5.1 to read: "Headers shall be provided over each opening in exterior bearing walls. The size and spans in Table 2308.4.1.1(1) are permitted to be used for Group R-5 occupancies." 15. Revise Table 2308.5.11 by deleting the row for "Hardboard panel siding" and adding a row to read: "Cement board sheathing | 1/2 inch | 16 inches on center" 15.1. Revise Section 2308.6.1 by deleting the last sentence. 15.2. Revise Table 2308.6.1 by deleting the row for a two-story building in Seismic Design Category C and all rows for Seismic Design Categories D and E. 16. Revise Table 2308.6.3(5) by deleting all rows for "direct to studs" siding. 17. Revise Section 2308.6.5.1 by deleting "approved." 18. Revise Section 2308.6.6.1 to read: "2308.6.6.1 Cripple wall bracing in Seismic Design Categories A, B and C. For the purposes of this section, cripple walls in Seismic Design Categories A, B and C having a stud height exceeding 14 inches (356 mm) shall be considered to be a story and shall be braced in accordance with Table 2308.6.1. Spacing of edge nailing for required cripple wall bracing shall not exceed 6 inches (152 mm) on center along the foundation plate and the top plate of the cripple wall. Nail size, nail spacing for field nailing and more restrictive boundary nailing requirements shall be as required elsewhere in the code for the specific bracing material used." 19. Delete Section 2308.6.6.2. 20. Revise Section 2308.6.7.2 by deleting "approved." 21. Revise Section 2308.6.8.1 by deleting all text after the first exception, including the subsequent exceptions. 22. Delete Section 2308.6.8.2. 23. Revise Section 2308.6.8.3 by replacing "Seismic Design Categories B, C, D and E" with "Seismic Design Categories B and C." 24. Delete Section 2308.6.10.2. 24.1. Revise the subtitle of Table 2308.7.1 (2) by deleting "limited." 24.2. Revise the subtitle of Table 2308.7.2(3) by deleting "Ground snow load = 30 psf,". 24.3. Delete Table 2308.7.2(4). 24.4. Revise the subtitle of Table 2308.7.2(5) by deleting "Ground snow load = 30 psf,". 24.5. Delete Table 2308.7.2(6). 24.6. Revise Table 2308.7.3.1 by deleting the columns for no snow load, deleting the columns for ground snow load = 50 psf, deleting the heading rows for "GROUND SNOW LOAD (pounds per square foot)" and "30 pounds per square foot," and deleting note g. 25. Revise the title of Table 2308.7.5 by deleting "approved." 26. Revise Table 2308.7.5 by: a. Revising the first column in the upper portion of the table to read: "RISK CATEGORY I or II III" b. Deleting the rows for V asd = 100 and 110. c. Revising note h by deleting "approved." d. Deleting note g. 27. Revise Section 2308.7.6.1 by replacing "Seismic Design Categories B, C, D and E" with "Seismic Design Categories B or C." 28. Revise Section 2308.7.11 by deleting "approved." (Amend Coun. J. 2-19-20, p. 14473, Art. II, § 84)

Municipal Code of Chicago § 14B-23-2309 Wood frame construction manual.

14B-23-2309 Wood frame construction manual. The provisions of Section 2309 of IBC are adopted by reference without modification.

Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2667379Fetched: 10/24/2026