International Building Code 2302.1
Definitions. The following words and terms shall, for
the purposes of this chapter, have the meanings shown herein.
ACCREDITATIONBODY. An approved, third-party organization
that is independent of the grading and inspection agencies,
and the lumber mills, and that initially accredits and
subsequently monitors, on a continuing basis, the competency
and performance of a grading or inspection agency related to
carrying out specific tasks.
BRACED WALL LINE. A series of braced wall panels in a
single story that meets the requirements of Section 2308.3 or
BRACEDWALL PANEL. A section of wall braced in accordance
with Section 2308.9.3 or 2308.12.4.
COLLECTOR. A horizontal diaphragm element parallel and
in line with the applied force that collects and transfers diaphragm
shear forces to the vertical elements of the lateral-
force-resisting system and/or distributes forces within the
CONVENTIONAL LIGHT-FRAME WOOD CONSTRUCTION.
A type of construction whose primary structural
elements are formed by a system of repetitive
wood-framing members. See Section 2308 for conventional
light-frame wood construction provisions.
CRIPPLEWALL. A framed stud wall extending from the top
of the foundation to the underside of floor framing for the lowest
occupied floor level.
DIAPHRAGM, UNBLOCKED. A diaphragm that has edge
nailing at supporting members only. Blocking between supporting
structural members at panel edges is not included. Diaphragm
panels are field nailed to supporting members.
DRAG STRUT. See “Collector.”
FIBERBOARD. A fibrous, homogeneous panel made from
lignocellulosic fibers (usually wood or cane) and having a density
of less than 31 pounds per cubic foot (pcf) (497 kg/m3) but
more than 10 pcf (160 kg/m3).
GLUED BUILT-UP MEMBER. A structural element, the
section of which is composed of built-up lumber, wood structural
panels orwood structural panels in combination with lumber,
all parts bonded together with structural adhesives.
GRADE (LUMBER). The classification of lumber in regard
to strength and utility in accordance with American Softwood
Lumber Standard DOC PS 20 and the grading rules of an
approved lumber rules-writing agency.
HARDBOARD. 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 pcf (497 kg/m3).
NAILING, BOUNDARY. A special nailing pattern required
by design at the boundaries of diaphragms.
NAILING, EDGE. A special nailing pattern required by
design at the edges of each panel within the assembly of a diaphragm
or shear wall.
NAILING, FIELD. Nailing required between the sheathing
panels and framing members at locations other than boundary
nailing and edge nailing.
NATURALLY DURABLE WOOD. The heartwood of the
following species with the exception that an occasional piece
with corner sapwood is permitted if 90 percent or more of the
width of each side on which it occurs is heartwood.
Decay resistant. Redwood, cedar, black locust and black
Termite resistant. Redwood and Eastern red cedar.
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 withDOCPS 20
for sawn lumber and with the AF&PA NDS for glued-laminated
PARTICLEBOARD. A generic term for a panel primarily
composed of cellulosic materials (usually wood), generally in
the form of discrete pieces or particles, as distinguished from
fibers. The cellulosic material is combined with synthetic resin
or other suitable bonding system by a process in which the
2006 INTERNATIONAL BUILDING CODE 421
interparticle bond is created by the bonding system under heat
PREFABRICATED WOOD I-JOIST. Structural member
manufactured using sawn or structural composite lumber
flanges and wood structural panel webs bonded together with
exterior exposure adhesives, which forms an “I” cross-sectional
PRESERVATIVE-TREATED WOOD. Wood (including
plywood) pressure treated with preservatives in accordance
with Section 2303.1.8.
SHEARWALL. A wall designed to resist lateral forces parallel
to the plane of a wall.
Shear wall, perforated. A wood structural panel sheathed
wall with openings, that has not been specifically designed
and detailed for force transfer around openings.
Shear wall segment, perforated. A section of shear wall
with full-height sheathing that meets the height-to-width
ratio limits of Section 2305.3.4.
STRUCTURAL COMPOSITE LUMBER. Structural member
manufactured using wood elements bonded together with
exterior adhesives. Examples of structural composite lumber
Laminated veneer lumber (LVL). A composite of wood
veneer sheet elements with wood fibers primarily oriented
along the length of the member.
Parallel strand lumber (PSL). A composite of wood
strand elements with wood fibers primarily oriented along
the length of the member.
STRUCTURAL GLUED-LAMINATED TIMBER. An
engineered, stress-rated product of a timber laminating plant,
comprised of assemblies of specially selected and prepared
wood laminations in which the grain of all laminations is
approximately parallel longitudinally and the laminations are
bonded with adhesives.
SUBDIAPHRAGM. A portion of a larger wood diaphragm
designed to anchor and transfer local forces to primary diaphragm
struts and the main diaphragm.
TIE-DOWN (HOLD-DOWN). A device used to resist uplift
of the chords of shear walls.
TREATED WOOD. Wood impregnated under pressure with
compounds that reduce its susceptibility to flame spread or to
deterioration caused by fungi, insects or marine borers.
WOOD SHEAR PANEL. A wood floor, roof or wall component
sheathed to act as a shear wall or diaphragm.
WOOD STRUCTURAL PANEL. A panel manufactured
from veneers, wood strands or wafers or a combination of
veneer andwood strands orwafers bonded together withwaterproof
synthetic resins or other suitable bonding systems.
Examples of wood structural panels are:
Composite panels. A wood structural panel that is comprised
of wood veneer and reconstituted wood-based material
and bonded together with waterproof adhesive;
Oriented strand board (OSB). A mat-formed wood structural
panel comprised of thin rectangular wood strands
arranged in cross-aligned layers with surface layers normally
arranged in the long panel direction and bonded with
waterproof adhesive; or
Plywood. A wood structural panel comprised of plies of
wood veneer arranged in cross-aligned layers. The plies are
bonded with waterproof adhesive that cures on application
of heat and pressure.