- Same as Peak
- ATTIC SCUTTLE
- Framed opening with removable cover providing access to the
- A structural support, usually a beam or wall that is designed by
the building designer to carry truss reaction loads to the
- BENDING MOMENT
- Term used in the analysis of the internal stresses across the
cross section of a member (chord or web) when it is subjected to
forces which cause it to bend.
- A term used to describe a gable shaped truss that is
clipped at the end.
- BOTTOM CHORD UPSET
- Same as BUTT CUT
- BOTTOM CHORD
- An inclined or horizontal member that establishes the bottom of
a truss. An example of an inclined bottom chord member is the bottom
chord of a scissors truss or a truss positioned between supports at
- BOTTOM CHORD BEARING
- Term usually used to describe the bearing condition of a
parallel chord truss that bears on its bottom chord.
- Wood or metal members that are placed between trusses
and joists in an angled position intended to spread the loads.
- BIRDSMOUTH CUT
- A long notch at the ends of a member to allow for an
overhang "over the wall height" less than the width of the member.
- BUILDING DESIGNER
- Registered architect or registered engineer who is responsible
for the design of the building.
- BUILDING OFFICIALS AND CODE ADMINISTRATORS INTERNATIONAL
- A model building code located in Country Club Hills, IL, serving
primarily the North Central and Northeast United States.
- BUILT-UP ROOF
- Roofing composed of three to five layers of asphalt.
- BUTT CUT
- Slight vertical cut at outside edge of truss bottom chord to
ensure uniform nominal span and tight joints.
- BUTT JOINT
- The interface at which the ends of two members or other
members meet in a square cut joint.
- Computer aided design and drafting (software).
- An upward curvature built into a truss bottom chord to
compensate for deflection due to loading conditions.
- The part of a truss that extends beyond its support,
exclusive of overhang.
- CENTER LINE SPAN
- Theoretical span sometimes used to design trusses.
- CLEAR SPAN
- (Clear Opening) GeneralIy indicates the inside or interior frame
to frame dimensions. Not to be confused with SPAN
- CLINCHED NAIL
- A nail selected to be longer than the member it is
driven through and which is bent back the dimension of its excess
- CLIPPED (CLIPPED END)
- Same as stubbed or stub truss.
- COLLAR BEAM
- Wooden member connecting opposite roof rafters.
- COLLAR TIE
- A horizontal member placed between two rafters a
specific vertical distance above the very top plate line for the
purpose of limiting outward thrust of the rafters.
- COMPOSITE LUMBER
- (Structural, wood composites) A family of materials that
contain wood in whole or fiber form bound together with an adhesive
of natural or synthetic form.
- COMPOUND CUT
- A double cut made across the member width.
- CONTRACT DOCUMENTS
- Architectural drawings (plans), specifications, etc., used
to produce a structure.
- CONVENTIONAL FRAMING.
- (Common Framing) Framing with conventional joists, rafters and
- Time-dependent deformation of a structural member under constant
- A ridge or drainage diverting roof framing. Generally found
on the high sloped end of a chimney.
- CUTTING SHEETS
- A diagram of lumber lengths and angles of cut for truss web
members and chords.
- CUTTING BILL
- See CUTTING SHEETS
- DIRECT NAIL
- To nail perpendicular to the member being nailed.
- Interior finish material sheet manufactured with gypsum
- The flat surface located at the outer end of a roof overhang
or cantilever end
- FEATHER CUT
- A heel cut which has been made with a zero butt cut (a sawn
member with a feathered edge).
- FlREPLACE TRUSS .
- A truss which has a modified shape to allow for penetration of a
roof chimney whose loads are supported by a fireplace master
(girder) truss. This truss requires special engineering.
- GABLE END FRAME
- A component manufactured to the profile of the mating
common truss. It has vertical "in-plane" members fastened to the
chords instead of diagonal web members. It is not a structural truss
and requires continuous support by a bearing wall or other load
bearing element such as a beam along the bottom chord.
- The portion of the roof above the eave line of a double
- A roof having two slopes on each side, the lower slope
usually steeper than the upper one.
- GIRDER TRUSS
- A truss designed to carry heavy loads from other
structural members framing into it. Usually a multiple ply truss.
- A computer and its peripherals (printer, plotter, etc.)
- A conventionally framed wood girder located between
stud, joist, rafter, or truss openings.
- HEEL JOINT
- The point on the truss where the top and bottom chords
- HIP MASTER
- Hip girder truss designed to carry prefabricated roof jacks or
common framing and hip corners.
- HYDRAULIC PRESS
- A press consisting of a "C" clamp hydraulic cylinder;
or an l-beam platen, or flat upper pressing platen, powered by
hydrauIic cylinders which are used to embed truss connector plates.
- INTERIOR BEARING
- Term used to describe supports which are interior to two
- The fixture which holds the truss in position until
rigidly fastened with connectors.
- See PANEL POINT
- A horizontal roof or floor framing member.
- Alternate expression for a truss web member cantilever
- KNEE BRACE
- A brace positioned between a column and truss panel points
when trusses are supported by columns lacking transverse bracing.
- LADDER PANEL
- Prefabricated wall panel fastened to the roof eave to create
a sloped overhang.
- LATERAL BRACING
- Members placed and connected at right angles to a chord or web
member of a truss.
- LET TAILS RUN
- When a piece of lumber making up the top chord is not
cut off to a specified overhang length, but retains the length of
the lumber used for the purpose of meeting specific overhang
requirements in the field.
- LEVEL RETURN
- Lumber filler placed horizontally from the end of an overhang to
the outside wall to form a soffit.
- Laminated Veneer Lumber.
- MITER CUT
- A single cut made at an angle to the member length.
- An electronic device used to transmit information from
one computer to another by means of telephone lines.
- Modulus of Elasticity.
- A force that produces rotation of a member and commensurate
- Metal plate connected wood truss.
- Machine stress rated lumber.
- NAIL-ON PLATE
- Light-gauge cold-formed steel truss connector plates with
pre-punched holes or, if cut to size, without holes having
identifying marks through which nails are driven by hand or
pneumatic means into the lumber. They are usually located on the
near face and far face of the joint.
- NAILER (Scab)
- A member fastened to another member by nails for
- NATIONAL DESIGN SPECIFICATION (NDS) FOR WOOD
- Publication of the American Forest & Paper Association
(AFPA) providing an appendix of lumber sizes, grades, species and
- NATIONAL DESIGN STANDARD FOR METAL PLATE CONNECTED WOOD
- A publication of the Truss Plate Institute (TPI) being
developed under the ANSI consensus process, to be designated as an
- NATIONAL EVALUATION REPORT (NER)
- Product acceptance research evaluation report prepared for
construction products that are not in the building code. This
evaluation report is prepared by the model building code group under
the Council of American Building Officials (CABO).
- NET FREE VENTILATED AREA
- Area required by building codes to allow for proper
ventilation in enclosed building spaces.
- NOMINAL SPAN
- Horizontal distance between outside edges of supports.
- A vertical and crosswise horizontal cut at the end of the
chord, joist or rafter.
- ON EDGE
- Vertical placement of a member's wide edge.
- ON THE FLAT
- Horizontal placement of a member's wide edge.
- OUT-TO-OUT SPAN
- Same as OVERALL SPAN
- A wood member nailed to a truss to form an overhang
beyond the wall line.
- OVERALL SPAN
- Outside of frame dimensions (not outside of veneer
- The extension of the top chord of a truss beyond the outside of
the bearing support.
- Parallel chord trusses.
- Licensed registered professional engineer.
- PANEL POINT
- The location on a truss where the web members intersect
the top and bottom chord.
- The chord segment defined by two adjacent joints.
- PANEL LENGTH
- The distance between joints measured along the chord center
- Point on the truss where the sloped chords meet.
- Common nail length. Originally, nails were sold by "penny
weight", or price per hundred.
- PIGGY BACK TRUSS
- A truss made in two pieces usually consisting of a hip type
truss with a triangular cap fastened to it. Designed when shipping
or manufacturing limitations are affected by overall truss height.
- The incline angle of the roof described as the ratio of the
total rise of the roof to the total width of the structure. For
example, a 10 foot rise and a 30 foot width gives a roof pitch of
one third. The roof pitch is also designated as the angle that the
top chord makes with the lower chord such as a 20 pitch or a 45
- PLACING DRAWING
- Line drawing used to located assumed placement
positions of roof and floor trusses by truss fabricator.
- PLUMB CUT
- Top chord end cut to provide for vertical (plumb)
installation of fascia.
- One truss of a girder truss.
- Purdue Plane Structures Analyzer. A wood structures computer
program developed at Purdue University. The latest edition is
- A term used to describe the device used to embed truss
- PRESS-ON PLATE
- A truss connector manufactured with pre-formed teeth that
are embedded into the lumber usually by an air or hydraulic press.
- PROFILE DRAWING
- Sketches of truss profiles used by mechanical engineer
to determine where mechanical ducts, piping, etc., are located.
- Parallel strand lumber.
- A horizontal member attached perpendicular to the truss top
chord for support of the roofing (i .e., corrugated roofing or
plywood and shingles).
- A sloping roof framing member.
- Edge of a roof with the intersection of the gable.
- RAKE OVERHANG PANEL
- Prefabricated overhang panel that extends over the edge of
the roof and is fastened to the gable end truss.
- REVIEW ENGINEER
- Term used to define the truss engineer who checks and
certifies computer generated designs of the truss fabricator. The
review engineer may be an employee experienced in the design and
testing of trusses, and assigned this responsibility by a truss
plate manufacturer. He may also be an independent consultant
experienced in the design and testing of metal plate connected
trusses, and contracted by the truss fabricator to perform such
services. Computer generated designs are assumed to be reviewed and
checked on the review engineer's computer.
- The horizontal line made by the top surfaces of the two
sloping roof surfaces
- RIDGE VENT
- A prefabricated and formed metal strip placed along the apex of
the roof to allow exhaust ventilation in combination with intake
soffit or gable end ventilation.
- Vertical distance form the bottom of the bottom chord
to bottom (inside) of the top chord.
- ROLLER PRESS
- A press that embeds connector plates by forcing them through
two opposing rollers.
- ROOF SCUTTLE
- Framed opening in commercial roofs surrounded by a hinged door
used for access to a commercial roof.
- Roof drain.
- SET BACK
- The distance from the outside edge of the wall exclusive of
veneer to the face of a hip master (girder) truss.
- SHOP DRAWING
- Drawings of roof trusses prepared by the truss fabricator from
truss engineering drawings used to fabricate trusses.
- SHOULDER JOINT
- Same as BREAK POINT JOINT.
- Two inch dimension Lumber inserted between the top and
bottom chords at the heel joint in the plane of the truss to
reinforce the top or bottom chord.
- The incline angle of the roof described in inches of rise
per foot of run (e.g., 6/12).
- SLOPED SOFFIT
- Sloped overhang with no level return .
- SOFFIT VENTS
- Prefabricated soffit material with perforated openings created
for the purpose of providing intake ventilation.
- The underside of a roof overhang or truss cantilever end.
- Computer programs used to create management and
engineering information, etc.
- Term generally used to communicate out-to-out span or
overall span of a truss design. Sometimes also indicates center line
to centerline of bearing.
- SPLICE POINT
- The point at which two chord members are joined
together to form a single member. It may occur at a panel point or
between panel points.
- SQUARE CUT
- End of top chord perpendicular to the slope of the member.
Cut made at 90 to the length of the member.
- STACKED CHORDS
- Term used for agricultural trusses when two members are
positioned on top of each other to create a bottom chord.
- Lumber industry terminology for lumber graded with
respect to its strength in bending when loaded on the narrow face.
Used for cross members in floors or ceilings.
- Two inch dimensional framing member attached perpendicular to
floor trusses often through the chase opening and placed vertically
against the vertical web.
- STUB TRUSS
- Same as BOB TAILED TRUSS
- STUDDED GABLE
- Terminology for a gable end truss built as a wall and resembling
a stud wall built in the shape of a triangle. Chords are usually ON
- The surface upon which the roofing membrane is placed.
- A brace consisting of two inch dimension lumber nailed
directly to the member requiring a brace, and with the width of the
member perpendicular to the width of the brace.
- Term used to describe outward horizontal force.
- A nail driven at an angle to the member.
- TOP CHORD BEARING
- The bearing condition of a parallel chord truss that bears
on its top chord extension. Can also apply to a sloping chord truss
bearing on a top chord extension.
- TOP PLATE
- Framing consisting of two members ON THE FLAT hat form the top
of exterior stud bearing walls of platform frame construction. A
single member ON THE FLAT in non-bearing wall construction.
- TOP CHORD
- An inclined or horizontal member that establishes the top member
of a truss.
- A conventionally framed wall usually consisting of fastened
multiple studs in a framed wall opening, used to carry the header
- An engineered structural component, assembled from wood
members, metal connector plates and other mechanical fasteners,
designed to carry its own weight and super imposed design loads. The
truss members form a semi-rigid structural framework and are
assembled such that the members form triangles.