Class Day Seventeen. Chapter 12 Light Gauge Steel Frame Construction.

Class Day SeventeenClass Day Seventeen

Chapter 12Light Gauge Steel

Frame Construction

Light Gauge is a termLight Gauge is a termUsed In comparison toUsed In comparison tohot rolled steel to formhot rolled steel to formstructural shapes forstructural shapes forframing buildings. framing buildings. HotHot

rolled steel is formedrolled steel is formed at temperatures justat temperatures just below melting point.below melting point.

Cold Formed means that the members are formedCold Formed means that the members are formedfrom a specific thickness and finish of sheet steel, from a specific thickness and finish of sheet steel,

then pressed with a form to make the shape then pressed with a form to make the shape desired. desired. Cold rolled steel is formed at room Cold rolled steel is formed at room temperaturetemperature

Light steel framing is a close parallel with wood Light steel framing is a close parallel with wood framing.framing.

External dimensions of members are similar.External dimensions of members are similar.They are used as closely spaced studs, They are used as closely spaced studs,

joists, joists, and raftersand raftersExterior sheathing and interior wallboard Exterior sheathing and interior wallboard

can can be attached directly to the framing be attached directly to the framing members.members.

Manufactured according To strict standards. Zinc Manufactured according To strict standards. Zinc coating prevents rustcoating prevents rust

Shapes are made to resist forces by forming to Shapes are made to resist forces by forming to resist load directionresist load direction

A single sheet of paper is very weak when laid flat A single sheet of paper is very weak when laid flat across two supports . . . across two supports . . .

But may be made much stronger when folded to a But may be made much stronger when folded to a different configuration . . .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 Strength & Stiffness depends on Configuration, Depth, & Thickness of Configuration, Depth, & Thickness of

materialmaterial

Thickness - GaugeDepth

Studs are manufactured in standard sizesStuds are manufactured in standard sizes

Standard widths are 1 ½”, 3 5/8”, 6”, and 8” Standard widths are 1 ½”, 3 5/8”, 6”, and 8” Standard thickness of material is 26 gage, but Standard thickness of material is 26 gage, but

thicker material is available for structural thicker material is available for structural conditions.conditions.

Standard Length lengths are 2’ foot increments, Standard Length lengths are 2’ foot increments, but custom lengths are available. but custom lengths are available.

Joists are made in standard depths, 6”, 8”, 10”, Joists are made in standard depths, 6”, 8”, 10”, and 12”, and a variety of gauge thicknesses are and 12”, and a variety of gauge thicknesses are available. Span and loading tables are provided available. Span and loading tables are provided by the manufacturers. by the manufacturers.

Gage compared to thickness: Gage compared to thickness: 26 gage = .0179 inch thick26 gage = .0179 inch thick1/64 inch = .0156 inch thick1/64 inch = .0156 inch thick

Punched for:•Wiring•Piping•Bracing

2’0” oc

Protective Conduit for WiringProtective Conduit for Wiring– MetalMetal– PlasticPlastic

ANCHORAGE

Steel studs fastened to bottom track with Self-Tapping Screws

Light Gage steel joists are similar to Light Wood Light Gage steel joists are similar to Light Wood Framing Framing

and just as the same for wood joists, and just as the same for wood joists, bridging between members within spans and end bridging between members within spans and end blocking is required to prevent the tendency to blocking is required to prevent the tendency to buckle or twist under load.buckle or twist under load.

Reinforcing the webReinforcing the web

Of joist ends addsOf joist ends adds

Strength to joists underStrength to joists under

Bearing wallsBearing walls

COMMON USES OF STEEL STUDSCOMMON USES OF STEEL STUDS

Interior Partition Framing,Interior Partition Framing,

either load bearing or noneither load bearing or non

load bearingload bearing

Exterior FramingExterior Framing

Heavier gage studsHeavier gage studs

are required forare required for

framing of walls thatframing of walls that

Support floor and roofSupport floor and roof

loads.loads.

Interior Partition Framing

Brick Veneer “Mockup” showing Metal Stud Backup Wall

Metal Studs as Support Structure for Exterior Gypsum Sheathing

Channel Bracing

Metal Studs used as Support for EIFS

Exterior Wall

Sheathing

Fastened with Self-Tapping

Screws

Metal Headers

EXTERIOR WALL FRAMING

Temporary Bracing

Multi story building framed with exterior steel studsApplied 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 FRAMINGSTEEL ROOF AND FLOOR FRAMING

Sections of steel sections to be used as joists, Sections of steel sections to be used as joists, rafters, and trusses are similar in shape to steel rafters, and trusses are similar in shape to steel studs, in that the cross section assumes a “C” studs, in that the cross section assumes a “C” shape, which is structurally oriented.shape, which is structurally oriented.

Units are made in standard sizes of 6”, 8”, 10”, Units are made in standard sizes of 6”, 8”, 10”, and 12”.and 12”.

Methods of attachment are the same as for wall Methods of attachment are the same as for wall framing, and assembly, bracing, and bridging is framing, and assembly, bracing, and bridging is similar to techniques used in wood framing. similar to techniques used in wood framing.

Structural load tables are available from Structural load tables are available from manufacturer of steel joist products.manufacturer of steel joist products.

ADVANTAGES TO USING STEEL FRAMINGADVANTAGES TO USING STEEL FRAMING

Easy to InstallEasy to Install

Higher quality materialHigher quality material

Dimensionally stableDimensionally stable

Lighter in weight, longer straight lengths availableLighter in weight, longer straight lengths available

Insect resistantInsect resistant

Non-combustible Non-combustible

Less waste, RecyclableLess waste, Recyclable

Not subject to moldNot subject to mold

DISADVANTAGES OF STEEL FRAMINGDISADVANTAGES OF STEEL FRAMING

Steel conducts electricity.Steel conducts electricity.

Requires isolation from dissimilar materials such Requires isolation from dissimilar materials such as copper, which reacts with copper. Electrolysis as copper, which reacts with copper. Electrolysis deteriorates zinc. deteriorates zinc.

Thermal transmission – must have a thermal Thermal transmission – must have a thermal break.break.

Installed cost of steel is more than wood.Installed cost of steel is more than wood.

Difficult to attach wall accessories unless Difficult to attach wall accessories unless preparation made before installing wallboard.preparation made before installing wallboard.

I’M OUTTA HERE