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Class Day Seventeen
Chapter 12
Light Gauge Steel
Frame Construction
Light Gauge is a term
Used In comparison to
hot rolled steel to form
structural shapes for
framing buildings. Hot
rolled steel is formed
at temperatures just
below melting point.
Cold Formed means that the members are formed
from a specific thickness and finish of sheet
steel, then pressed with a form to make the
shape desired. Cold rolled steel is formed at
room temperature
Light steel framing is a close parallel with wood
framing.
External dimensions of members are similar.
They are used as closely spaced studs, joists,
and rafters
Exterior sheathing and interior wallboard can
be attached directly to the framing members.
Manufactured according To strict standards. Zinc
coating prevents rust
Shapes are made to resist forces by forming to
resist load direction
A single sheet of paper is very weak when laid flat
across two supports . . .
But may be made much stronger when folded to a
different configuration . . .
Cold rolled studs and joists are formed in “C”
shapes, which provides lateral strength for studs
and vertical strength for joists and rafters.
Strength & Stiffness depends on
Configuration, Depth, & Thickness of
material
Depth
Thickness - Gauge
Studs are manufactured in standard sizes
Standard widths are 1 ½”, 3 5/8”, 6”, and 8”
Standard thickness of material is 26 gage, but
thicker material is available for structural
conditions.
Standard Length lengths are 2’ foot increments,
but custom lengths are available.
Joists are made in standard depths, 6”, 8”, 10”,
and 12”, and a variety of gauge thicknesses are
available. Span and loading tables are provided
by the manufacturers.
Gage compared to thickness:
26 gage = .0179 inch thick
1/64 inch = .0156 inch thick
2’0” oc
Punched for:
•Wiring
•Piping
•Bracing
Protective Conduit for Wiring
– Metal
– Plastic
ANCHORAGE
Steel studs fastened to bottom
track with Self-Tapping Screws
Light Gage steel joists are similar to Light Wood
Framing
and just as the same for wood joists, bridging
between members within spans and end blocking
is required to prevent the tendency to buckle or
twist under load.
Reinforcing the web
Of joist ends adds
Strength to joists under
Bearing walls
COMMON USES OF STEEL STUDS
Interior Partition Framing,
either load bearing or non
load bearing
Exterior Framing
Heavier gage studs
are required for
framing of walls that
Support floor and roof
loads.
Interior Partition Framing
Brick Veneer “Mockup” showing
Metal Stud Backup Wall
Channel
Bracing
Metal Studs as Support Structure for Exterior Gypsum
Sheathing
Metal Studs used as Support for EIFS
Exterior
Wall
Sheathing
Fastened with
Self-Tapping
Screws
Temporary
Bracing
Metal
Headers
EXTERIOR WALL FRAMING
Multi story building framed with exterior steel studs
Applied directly to the structural frame.
Metal Studs used at the “Grill
Area” in a restaurant kitchen
Long
Studs
Metal Studs are
available
in Sizes not
Possible in
Framing Lumber
STEEL ROOF AND FLOOR FRAMING
Sections of steel sections to be used as joists,
rafters, and trusses are similar in shape to steel
studs, in that the cross section assumes a “C”
shape, which is structurally oriented.
Units are made in standard sizes of 6”, 8”, 10”,
and 12”.
Methods of attachment are the same as for wall
framing, and assembly, bracing, and bridging is
similar to techniques used in wood framing.
Structural load tables are available from
manufacturer of steel joist products.
ADVANTAGES TO USING STEEL FRAMING
Easy to Install
Higher quality material
Dimensionally stable
Lighter in weight, longer straight lengths available
Insect resistant
Non-combustible
Less waste, Recyclable
Not subject to mold
DISADVANTAGES OF STEEL FRAMING
Steel conducts electricity.
Requires isolation from dissimilar materials such
as copper, which reacts with copper. Electrolysis
deteriorates zinc.
Thermal transmission – must have a thermal
break.
Installed cost of steel is more than wood.
Difficult to attach wall accessories unless
preparation made before installing wallboard.
I’M OUTTA HERE