Light-Gauge Steel Framing Details: Cold-Formed Steel for Mid-Rise Multifamily and Commercial

Light-gauge steel framing (cold-formed steel, CFS) provides structural framing for mid-rise multifamily, commercial, and institutional construction. Cold-formed (vs hot-rolled structural steel) at room temperature into shapes — studs, joists, tracks. AISI (American Iron and Steel Institute) standards govern design including AISI S100 specification. Substantial advantages over wood for mid-rise including non-combustibility, dimensional stability, faster construction. Specialty subcontractors typical. Understanding CFS framing helps construction firms evaluate this growing structural option.

This post covers light-gauge steel framing details.

CFS Materials

CFS material specific:

CFS material specific characteristics. Cold-formed at room temperature into shapes from coiled steel. Galvanized for corrosion resistance (typically G60 or G90 zinc coating). Various gauges 12-25 gauge typical (heavier 12-16 ga structural, lighter 18-25 ga interior). Various depths 2.5-12 inch typical. Various profiles including C-stud, track, joist. AISI S100 specification governs design. ASTM A653 specifies material properties.

Applications

CFS applications:

CFS applications. Mid-rise multifamily 4-6 stories typical — substantial market vs wood Type V or concrete. Commercial low-rise. Institutional including schools, healthcare. Curtain wall framing (back-up framing for facade). Interior partitions substantial commercial application. Roof and floor joists. Specific to load requirements — heavier gauge for substantial loads.

Mid-Rise Construction

Mid-rise advantages:

Mid-rise advantages substantial. Non-combustible vs Type V wood reducing fire risk and insurance. Substantial fire ratings achievable through assemblies. Dimensional stability vs wood (no shrinkage from moisture). Faster construction than wood typical. Less labor than wood through prefabrication potential. Specific code provisions for CFS. Substantial market opportunity — mid-rise growing segment with CFS competitive vs alternatives.

Panelization

Panelization substantial benefit:

Panelization substantial CFS benefit. Wall panels prefabricated offsite — entire walls including framing, sheathing, sometimes electrical/plumbing rough-in. Floor cassettes prefabricated. Roof panels. Substantial schedule benefit — substantial work moved offsite. Quality control improved through factory environment. Specific to manufacturer including FrameCo, BuildSmart, Prescient, others. Substantial CFS market segment with substantial growth.

Connections and Hardware

Connections specific:

Connections and hardware specific to CFS. Self-drilling screws standard — various sizes per application. Welding sometimes for substantial connections. Specific clip systems (Simpson Strong-Tie, Cemco, others) for specific applications. Specific to load. Engineering specifies hardware per design. Substantial hardware vs wood — typically more connection points required.

Specialty Subcontractors

Specialty subcontractors typical:

Specialty subcontractors typical for CFS framing. CFS framing subcontractors specialize in this work. Specialty erection contractors handling panelized erection. Panelizer/manufacturer involvement when panelized. Specific to scope. Substantial industry with established players. AISI Cold-Formed Steel Engineers Institute (CFSEI) substantial industry organization.

Bottom Line

Light-gauge steel framing structural option for mid-rise multifamily, commercial, institutional. CFS materials cold-formed galvanized steel in various gauges and profiles. AISI S100 specification governs. Applications include mid-rise multifamily, commercial low-rise, institutional, curtain wall back-up. Mid-rise advantages include non-combustibility, dimensional stability, schedule. Panelization substantial benefit. Connections specific to CFS. Specialty subcontractors typical. For construction firms, CFS substantial structural option for specific markets. Quality specialty knowledge supports successful delivery.