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Terms Used in the Post Frame Industry

Anchor Bolts: Bolts used to anchor structural
members to a foundation. Commonly used in
post-frame construction to anchor posts to the
concrete foundation.
Bay: The area between adjacent primary frames
in a building. In a post-frame building, a bay is
the area between adjacent post-frames.
Bearing Height: Vertical distance between a
pre-defined baseline (generally the grade line)
and the bearing point of a component.
Bearing Point: The point at which a component
is supported.
Bottom Chord: An inclined or horizontal member
that establishes the bottom of a truss.
Cladding: The exterior and interior coverings
fastened to the wood framing.
Clear Height: Vertical distance between the
finished floor and the lowest part of a truss, rafter,
or girder.
Collars: Components that increase the bearing
area of portions of the post foundation, and thus
increase lateral and vertical resistance.
Components and Cladding: Elements of the
building envelope that do not qualify as part of
the main wind-force resisting system. In post frame
buildings, this generally includes individual purlins and
girts, and cladding.
Diaphragm: A structural assembly comprised of
structural sheathing (e.g., plywood, metal cladding)
that is fastened to wood or metal framing
in such a manner the entire assembly is capable
of transferring in-plane shear forces..
Eave: The part of a roof that projects over the
sidewalls. In the absence of an overhang, the
eave is the line along the sidewall formed by the
intersection of the wall and roof planes.
Fascia: Flat surface (or covering) located at the
outer end of a roof overhang or cantilever end.
Flashing: Sheet metal or plastic components
used at major breaks and/or openings in walls
and roofs to insure weather-tightness in a structure.
Footing: Support base for a post or foundation
wall that distributes load over a greater soil area.
Gable: Triangular portion of the end wall of a
building directly under the sloping roof and
above the eave line.
Gable Roof: Roof with one slope on each side.
Each slope is of equal pitch.
Gambrel Roof: Roof with two slopes on each
side. The pitch of the lower slope is greater
than that of the upper slope.
Girder: A large, generally horizontal, beam.
Commonly used in post-frame buildings to support
trusses whose bearing points do not coincide
with a post.
Girt: A secondary framing member that is attached
(generally at a right angle) to posts. Girts
laterally support posts and transfer load between
wall cladding and posts.
Glued-Laminated Timber: 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.
Grade Line (grade level): The line of intersection
between the building exterior and the top of
the soil, gravel, and/or pavement in contact with
the building exterior. For post-frame building
design, the grade line is generally assumed to
be no lower than the lower edge of the splashboard.
Header: A structural framing member that supports
the ends of structural framing members
that have been cut short by a floor, wall, ceiling,
or roof opening.
Hip Roof: Roof which rises by inclined planes
from all four sides of a building.

Knee Brace: Inclined structural framing member
connected on one end to a post/column and on
the other end to a truss/rafter.
Laminated Assembly: A structural member
comprised of dimension lumber fastened together
with mechanical fasteners and/or adhesive.
Loads: Forces or other actions that arise on
structural systems from the weight of all permanent
construction, occupants and their possessions,
environmental effects, differential settlement,
and restrained dimensional changes.
Dead Loads: Gravity loads due to the
weight of permanent structural and nonstructural
components of the building, such
as wood framing, cladding, and fixed service
Snow Load: A load imposed on a structure
due to accumulated snow.
Wind Loads: Loads caused by the wind
blowing from any direction.
Lumber Grade: The classification of lumber in
regard to strength and utility in accordance with
the grading rules of an approved (ALSC accredited)
lumber grading agency.
Main Wind-Force Resisting System: An assemblage
of structural elements assigned to
provide support and stability for the overall
structure. Main wind-force resisting systems in
post-frame buildings include the individual post frames,
diaphragms and shear wall.
Manufactured Component. A component that
is assembled in a manufacturing facility. The
wood trusses and laminated columns used in
post-frame buildings are generally manufactured
Mechanically Laminated Assembly: A laminated
assembly in which wood laminations have
been joined together with nails, bolts and/or
other mechanical fasteners.
Metal Cladding: Metal exterior and interior coverings,
usually cold-formed aluminum or steel
sheet, fastened to the structural framing.
NFBA: National Frame Builders Association.
Nominal size: The named size of a member,
usually different than actual size (as with lumber).
Orientated Strand Board (OSB): Structural
wood panels manufactured from reconstituted,
mechanically oriented wood strands bonded
with resins under heat and pressure.
Plywood: A built-up panel of laminated wood
veneers. The grain orientation of adjacent veneers
are typically 90 degrees to each other.
Pole: A round, unsawn, naturally tapered post.
Post: A rectangular member generally uniform
in cross section along its length. Post may be
sawn or laminated dimension lumber. Commonly
used in post-frame construction to transfer
loads from main roof beams, trusses or rafters
to the foundation.
Post Embedment Depth: Vertical distance between
the bottom of a post and the lower edge
of the splashboard.
Post Foundation: The embedded portion of a
structural post and any footing and/or attached
Post Foundation Depth: Vertical distance between
the bottom of a post foundation and the
lower edge of the splashboard.
Post-Frame: A structural building frame consisting
of a wood roof truss or rafters connected to
vertical timber columns or sidewall posts.
Post-Frame Building: A building system whose
primary framing system is principally comprised
of post-frames.
Post Height: The length of the non-embedded
portion of a post.
Pressure Preservative Treated (PPT) Wood:
Wood pressure-impregnated with an approved
preservative chemical under approved treatment
and quality control procedures.
Primary Framing: The main structural framing
members in a building. The primary framing
members in a post-frame building include the
columns, trusses/rafters, and any girders that
transfer load between trusses/rafters and columns.
Purlin: A secondary framing member that is
attached (generally at a right angle) to rafters/
trusses. Purlins laterally support rafters and
trusses and transfer load between exterior cladding
and rafters/trusses.

Rafter: A sloping roof framing member.
Rake: The part of a roof that projects over the
end walls. In the absence of an overhang, the
rake is the line along the end wall formed by the
intersection of the wall and roof planes.
Ridge: Highest point on the roof of a building
which describes a horizontal line running the
length of the building.
Roof Overhang: Roof extension beyond the
end wall/sidewall of a building.
Roof Slope: The angle that a roof surface
makes with the horizontal. Usually expressed in
units of vertical rise to 12 units of horizontal run.
Secondary Framing: Structural framing members
that are used to (1) transfer load between
exterior cladding and primary framing members,
and/or (2) laterally brace primary framing members.
The secondary framing members in a
post-frame building include the girts, purlins and
any structural wood bracing.
Shearwall: A vertical diaphragm in a structural
framing system. A shear wall is any end wall,
sidewall, or intermediate wall capable of transferring
in-plane shear forces.
Soffit: The underside covering of roof overhangs.
Soil Pressure: Load per unit area that the foundation
of a structure exerts on the soil.
Span: Horizontal distance between two points.
Splashboard: A preservative treated member
located at grade that functions as the bottom
girt. Also referred to as a skirtboard, splash
plank, bottom plank, and grade girt.
Stitch (or Seam) Fasteners: Fasteners used to
connect two adjacent pieces of metal cladding,
and thereby adding shear continuity between
Top Chord: An inclined or horizontal member
that establishes the top of a truss.
Truss: An engineered structural component,
assembled from wood members, metal connector
plates and/or other mechanical fasteners,
designed to carry its own weight and superimposed
design loads.