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Title: Section 2302  •  Size: 10052

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2302.1 Definitions. The following terms used in this chapter shall have the meanings indicated in this section:

AFPA is the American Forest and Paper Association, 1111 19th Street, N.W., Suite 800, Washington, D.C. 20036 (formerly NFoPA, National Forest Products Association).

AHA is the American Hardboard Association, Inc., 520 North Hicks Road, Palatine, Illinois 60067.

AITC is the American Institute of Timber Construction, 11818 S.E. Mill Plain Boulevard, Suite 415, Vancouver, Washington 98684.

APA is the American Plywood Association, 7011 South 19th Street, Tacoma, Washington 98411.

AWPA is the American Wood Preservers Association, Post Office Box 849, Stevensville, Maryland 21666.


BLOCKED DIAPHRAGM is a diaphragm in which all sheathing edges not occurring on framing members are supported on and connected to blocking.

BRACED WALL LINE is a series of braced wall panels in a single story which meets the requirements of Section 2326.11.3.

BRACED WALL PANEL is a section of wall braced in accordance with Section 2326.11.3.

CONVENTIONAL LIGHT-FRAME CONSTRUCTION is a type of construction whose primary structural elements are formed by a system of repetitive wood-framing members. Refer to Section 2326 for conventional light-frame construction provisions.

DIAPHRAGM is a horizontal or nearly horizontal system acting to transmit lateral forces to the vertical resisting elements. When the term ``diaphragm'' is used, it includes horizontal bracing systems.

FIBERBOARD is a fibrous-felted, homogeneous panel made from lignocellulosic fibers (usually wood or cane) and having a density of less than 31 pounds per cubic foot (497 kg/) but more than 10 pounds per cubic foot (160 kg/).

GLUED BUILT-UP MEMBERS are structural elements, the sections of which are composed of built-up lumber, wood structural panels or wood structural panels in combination with lumber, all parts bonded together with adhesives.

GRADE (Lumber), the classification of lumber in regard to strength and utility in accordance with the grading rules of an approved lumber grading agency.

HARDBOARD is a fibrous-felted, homogeneous panel made from lignocellulosic fibers consolidated under heat and pressure in a hot press to a density not less than 31 pounds per cubic foot (497 kg/).

NELMA is the Northeastern Lumber Manufacturers Association, 4 Fundy Road, Falmouth, Maine 04105.

NHPMA is the Northern Hardwood and Pine Manufacturers Association (serviced by NELMA), 4 Fundy Road, Falmouth, Maine 04105.

NLGA is the National Lumber Grades Authority, Post Office Box 97, Granges, B.C., Canada V0S 1E0.

NOMINAL SIZE (Lumber), the commercial size designation of width and depth, in standard sawn lumber and glued-laminated lumber grades; somewhat larger than the standard net size of dressed lumber, in accordance with U.B.C. Standard 23-1 for sawn lumber.

NORMAL LOADING, a design load that stresses a member or fastening to the full allowable stress tabulated in this chapter. This loading may be applied for approximately 10 years, either continuously or cumulatively, and 90 percent of this load may be applied for the remainder of the life of the member or fastening.

PARTICLEBOARD is a manufactured panel product consisting of particles of wood or combinations of wood particles and wood fibers bonded together with synthetic resins or other suitable bonding system by a bonding process in accordance with U.B.C. Standard 23-4.

PLYWOOD is a panel of laminated veneers conforming to U.B.C. Standard 23-2 or 23-3.

RIS is the Redwood Inspection Service, 591 Redwood Highway, Suite 3100, Mill Valley, California 94941.

ROTATION is the torsional movement of a diaphragm about a vertical axis.

SPIB is the Southern Pine Inspection Bureau, 4709 Scenic Highway, Pensacola, Florida 32504.

STRUCTURAL GLUED-LAMINATED TIMBER is any member comprising an assembly of laminations of lumber in which the grain of all laminations is approximately parallel longitudinally, in which the laminations are bonded with adhesives.

SUBDIAPHRAGM is a portion of a larger wood diaphragm designed to anchor and transfer local forces to primary diaphragm struts and the main diaphragm.

TREATED WOOD is wood treated with an approved preservative under treating and quality control procedures.

WCLIB is the West Coast Lumber Inspection Bureau, 6980 S.W. Varnes Road, Post Office Box 23145, Portland, Oregon 97223.

WOOD OF NATURAL RESISTANCE TO DECAY OR TERMITES is the heartwood of the species set forth below. Corner sapwood is permitted on 5 percent of the pieces provided 90 percent or more of the width of each side on which it occurs is heartwood. Recognized species are:

Decay resistant:
Redwood, Cedars, Black Locust
Termite resistant:
Redwood, Eastern Red Cedar

WOOD STRUCTURAL PANEL is a structural panel product composed primarily of wood and meeting the requirements of U.B.C. Standard 23-2 or 23-3. Wood structural panels include all-veneer plywood, composite panels containing a combination of veneer and wood-based material, and matformed panels such as oriented strand board and waferboard.

WWPA is the Western Wood Products Association, 1500 Yeon Building, Portland, Oregon 97204.

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