APEX / PEAK
The uppermost point of a truss.
A structural support, usually a wall,
that occurs at the top or bottom chord or between
the end points of a truss.
A horizontal or inclined (ie. Scissor
truss) member that establishes the lower edge
of a truss.
May refer to Lateral, Temporary or Permanent
Bracing indicating members installed to resist
Extension of the bottom chord beyond
its support – exclusive of overhang.
Horizontal distance between outer edges
of supports – also truss span.
Any permanent load such as the weight
of roofing, flooring, sheathing, insulation, or
ceiling material, as well as the weight of the
Gable truss in which the top chord has
been dropped vertically in order to allow outlookers
to form an overhang.
Truss specifically designed to carry additional
loads such as other trusses, beams or stick framing.
Point on a truss at which the bottom
and top chords generally meet, measurement is
taken from the bottom of the bottom chord to the
top of the top chord vertically.
Refers to trusses used to create a hip
roof as shown in sample.
A member placed and connected at right
angles to a chord or web member of a truss.
Any loading which is not of a permanent
nature (eg. Snow, wind)
Vertical distance from bottommost part
of the bottom chord to uppermost point of the
The extension of the top chord of a truss
beyond the heel measured horizontally.
where a web or webs intersect a chord.
Point on a truss where the sloped chords
Reinforcing members that are installed
in a system that are intended to remain permanently.
Where a truss may be too tall to build
and/or deliver it may be divided into two separate
parts with a ‘piggyback’ resting on
top of a base truss.
Inches of vertical rise for each 12
inches of horizontal run.
Top chord at overhang is cut plumb to
the building in order to allow for installation
Line formed by truss apexes.
Distance between centerlines of trusses
– usually 24” O.C.(on center).
Horizontal distance between outside edges
The point at which two members are joined
to create a continuous member, a top or bottom
Reduction of overall length (or height)
of a truss without changing the remaining portion
of the truss.
Members installed to brace system during
erection and installation.
An inclined or horizontal member that
establishes the upper edge of a truss –
rafter in conventional frame.
A self-contained triangulated frame designed
to clear span between supports.
Members that join the top and bottom
chords to form the triangular patterns that give
the truss strength.
parts of a truss diagram