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Title: Section 2303  •  Size: 9925

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2303.1 Standard of Quality. The standards listed below labeled a "U.B.C. standard" are also listed in Chapter 35, Part II, and are part of this code. The other standards listed below are recognized standards (see Sections 3502 and 3503).

1. Grading rules.

1.1 U.B.C. Standard 23-1, Classification, Definition and Methods of Grading for All Species of Lumber

1.2 Standard Grading Rules for Canadian Lumber, United States Edition, NLGA

1.3 Standard Grading Rules No. 17, WCLIB

1.4 Standard Grading Rules, WWPA

1.5 Grading Rules, NHPMA

1.6 Grading Rules, SPIB

1.7 Standard Specifications for Grades of California Redwood Lumber, RIS

1.8 Standard Grading Rules, NELMA

2. Structural glued-laminated timber.

2.1 ANSI/AITC Standard A190.1 and ASTM D 3737, Design and Manufacture of Structural Glued-laminated Timber

2.2 Standard Specifications for Structural Glued-laminated Timber of Softwood Species, AITC 117; Manufacturing, AITC 117; Design and Standard Specifications for Hardwood Glued-laminated Timber, AITC 119.

2.3 AITC 200 of the American Institute of Timber Construction, ANSI/AITC 190.1, Tests for Structural Glued-laminated Timber.

2.4 AITC 500, Determination of Design Values for Structural Glued-laminated Timber in accordance with ASTM D 3737, American Institute of Timber Construction.

3. Preservative treatment by pressure processes and quality control.

Standard Specifications C1, C2, C3, C4, C9, C14, C15, C16, C22, C23, C24, C28 and M4, AWPA

4. Product standards.

4.1 U.B.C. Standard 23-2, Construction and Industrial Plywood

4.2 U.B.C. Standard 23-3, Performance Standard for Wood-Based Structural-Use Panels

4.3 U.B.C. Standard 23-4, Mat-formed Wood Particleboard

4.4 ANSI 05.1, Wood Poles-Specifications and Dimensions

4.5 ASTM D25, Round Timber Piles

4.6 ANSI/AHA A194.1, Cellulosic Fiber Insulating Board (Fiberboard)

4.7 ANSI/AHA 135.6, Hardboard Siding

5. Design.

ASTM D 5055, Structural Capacities of Prefabricated Wood I-Joists

6. Fire retardancy.

6.1 U.B.C. Standard 23-5, Fire-retardant-treated Wood Tests on Durability and Hygroscopic Properties

6.2 U.B.C. Standard 23-6, Fire-retardant-treated Wood

7. Adhesives and glues.

7.1 ASTM D 3024, Dry Use Adhesives with Protein Base, Casein Type

7.2 ASTM D 2559, Wet Use Adhesives

7.3 APA Specification AFG-01, Adhesives for Field Gluing Plywood to Wood Framing

7.4 ASTM D 1101 and AITC 200 in Testing of Glue Joints in Laminated Wood Product.

8. Design values.

8.1 ASTM D 1990, Establishing Allowable Properties for Visually-Graded Dimension Lumber from In-Grade Tests of Full-Size Specimens.

8.2 ASTM D 245-88, Establishing Structural Grades and Related Allowable Properties for Visually Graded Lumber.

8.3 ASTM D 2555-88, Standard Test Methods for Establishing Clear Wood Strength Values.

2303.2 Minimum Capacity or Grade. Minimum capacity of structural framing members may be established by performance tests. When tests are not made, capacity shall be based on allowable stresses and design criteria specified in this code.

Studs, joists, rafters, foundation plates or sills, planking 2 inches (51 mm) or more in depth, beams, stringers, posts, structural sheathing and similar load-bearing members shall be of at least the minimum grades set forth in Table 23-I-A-1, 23-I-A-2 or 23-I-A-3. Approved end-jointed lumber may be used interchangeably with solid-sawn members of the same species and grade. Such use shall include, but not be limited to, light-framing joists, planks and decking.

Wood structural panels shall be one of the grades specified in U.B.C. Standard 23-2 or 23-3.

2303.3 Dried Fire-retardant-treated Wood. Approved fire-retardant-treated wood shall be dried, following treatment, to a maximum moisture content as follows: solid-sawn lumber 2 inches (51 mm) in thickness or less to 19 percent, and plywood to 15 percent.

2303.4 Metal-plate-connected Wood Trusses. Metal-plate-connected wood trusses shall conform to the provisions of Section 2311.6 and Division III.

2303.5 Size of Structural Members. Sizes of lumber and structural glued-laminated timber referred to in this code are nominal sizes. Computations to determine the required sizes of members shall be based on the net dimensions (actual sizes) and not the nominal sizes.

2303.6 Shrinkage. Consideration shall be given in the design to the possible effect of cross-grain dimensional changes considered vertically which may occur in lumber fabricated in a green condition.

2303.7 Fabrication. Preparation, fabrication and installation of wood members and their fastenings shall conform to accepted engineering practices and to the requirements of this code.

2303.8 Workmanship. All members shall be framed, anchored, tied and braced so as to develop the strength and rigidity necessary for the purposes for which they are used.

2303.9 Rejection. The building official may deny permission for the use of a wood member where permissible grade characteristics or defects are present in such a combination that they affect the serviceability of the member.

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