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definitions index
ACCREDITATION
BODY. 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 2308.12.4.
BRACED WALL
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 diaphragm.
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.
CRIPPLE WALL.
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 or wood 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 walnut.
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
with DOCPS 20 for sawn lumber and with the AF&PA NDS for
glued-laminated lumber.
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 interparticle bond is created by the
bonding system under heat and pressure.
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 shape.
PRESERVATIVE-TREATED
WOOD. Wood
(including plywood) pressure treated with preservatives in
accordance with Section 2303.1.8.
SHEAR WALL.
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
are:
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 and wood strands or wafers bonded
together with waterproof 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.
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