THE COMPLETE GUIDE TO STEEL STUD FRAMING IN COMMERCIAL CONSTRUCTION

Introduction to Steel Stud Framing

Steel stud framing has become the dominant method for constructing interior partition walls and exterior curtain wall assemblies in commercial buildings across Canada. In Edmonton and throughout Alberta, virtually every new commercial office building, retail centre, institutional facility, and industrial complex relies on light-gauge steel framing for its interior wall systems. Understanding how these systems work — from material specifications to installation methods to code compliance — is essential knowledge for any construction professional working in the Division 9 sector.

Light-gauge steel framing, also referred to as cold-formed steel (CFS) framing, consists of thin-gauge galvanized steel members that are roll-formed into C-shaped studs and U-shaped tracks. These components are assembled on-site to create the structural skeleton of interior partition walls, exterior non-structural walls, soffits, and ceiling framing systems. The system is governed by ASTM C645 (for non-structural applications) and ASTM C754 (for installation), as well as the National Building Code of Canada (NBC) and the Alberta Building Code (ABC).

This guide provides a comprehensive technical reference for steel stud framing in commercial construction, with a particular focus on the Edmonton and Alberta market. It covers material selection, stud spacing standards, installation methods, fire-rated assemblies, deflection requirements, code compliance, and cost considerations. Whether you are a project manager, estimator, architect, or field supervisor, this guide will provide the technical foundation you need to work confidently with steel stud framing systems.

Materials and Components

A steel stud framing system consists of several key components, each with specific material and dimensional requirements. Understanding these components and their specifications is the foundation of any successful framing project.

Steel Studs

Steel studs are the vertical members of the framing system. They are roll-formed from galvanized steel coil into a C-shaped cross-section with a web, two flanges, and two lips. The standard stud widths used in commercial construction are 1-5/8", 2-1/2", 3-5/8", 4", 6", and 8". The most common width for interior partitions in commercial buildings is 3-5/8" (92mm), which provides adequate cavity depth for insulation, wiring, and plumbing while keeping the overall wall thickness manageable.

Steel gauge (thickness) is a critical specification. For non-structural interior partitions, 25-gauge (0.018" / 0.46mm) and 20-gauge (0.033" / 0.84mm) studs are most common. For taller walls, walls subject to higher lateral loads, or walls that must meet specific deflection criteria, heavier gauges such as 18-gauge (0.043" / 1.09mm) or 16-gauge (0.054" / 1.37mm) may be required. The engineer of record will specify the required gauge based on the wall height, stud spacing, and design loads.

Tracks

Tracks are the horizontal members that form the top and bottom of the wall assembly. They are U-shaped in cross-section and are designed to receive the studs. Track widths must match the stud width. Standard track depths are 1-1/4" for most applications. Deflection tracks (also called slotted tracks or drift clips) are a specialized type of top track used in applications where the wall must accommodate vertical movement of the structure above — a critical requirement in most commercial buildings.

Galvanization and Corrosion Protection

All steel framing components used in commercial construction must be galvanized to protect against corrosion. The minimum galvanization requirement for interior framing is G40 (ASTM A653), which provides 0.40 oz/ft² of zinc coating. In areas subject to moisture — such as exterior walls, areas adjacent to plumbing, or below-grade applications — G60 or G90 galvanization is typically specified. In Edmonton's climate, where buildings experience significant temperature swings and potential condensation issues, proper galvanization specification is particularly important.

Stud Spacing Standards

Stud spacing is one of the most critical variables in steel stud framing design. The spacing must be selected based on the wall height, the design loads on the wall, the drywall thickness being applied, and any special requirements such as fire ratings or acoustic performance. The most common stud spacings in commercial construction are 16" on-centre (406mm o.c.) and 24" on-centre (610mm o.c.).

For standard interior partitions in commercial office buildings, 24" o.c. spacing with 25-gauge or 20-gauge studs is typically sufficient for walls up to approximately 10 feet (3.0m) in height. For taller walls — which are common in commercial buildings with 10' to 14' floor-to-ceiling heights — closer spacing or heavier gauge studs may be required to meet the deflection criteria specified in the building code.

The National Building Code of Canada and the Alberta Building Code require that non-structural partition walls be designed to resist a minimum lateral load of 0.25 kPa (5 psf), with a maximum deflection of L/240 under this load. For walls in areas subject to higher loads — such as corridors, stairwells, or areas adjacent to mechanical equipment — the deflection limit may be more stringent, such as L/360 or L/480.

Installation Methods

Proper installation of steel stud framing is critical to the performance of the finished wall assembly. The following describes the standard installation sequence for a commercial interior partition wall.

Step 1 — Layout: The wall layout is transferred from the construction drawings to the floor and ceiling using a chalk line or laser level. The layout must be accurate to within 1/8" to ensure that the finished wall aligns with door frames, window openings, and adjacent construction.

Step 2 — Track Installation: The bottom track is fastened to the concrete floor slab using powder-actuated fasteners (PAFs) or concrete screws at a maximum of 24" o.c. and within 2" of each end. A continuous bead of acoustic sealant is applied under the bottom track before fastening to provide an air and sound seal. The top track is fastened to the structure above in a similar manner, except that a deflection track is used if the wall must accommodate structural movement.

Step 3 — Stud Installation: Studs are cut to length and inserted into the top and bottom tracks. Studs are not fastened to the bottom track in most commercial applications, allowing for slight vertical adjustment. Studs are fastened to the top track with a minimum of one screw per flange. At door openings and other openings, double studs (king studs and jack studs) are installed to carry the header load.

Step 4 — Bracing and Bridging: For walls over 8 feet in height, horizontal bracing (bridging) is required at intervals not exceeding 4'-8" (1.4m) to prevent stud rotation and lateral buckling. Bridging is typically installed using a continuous cold-rolled channel (CRC) or flat strap, fastened to each stud with a bridging clip.

Step 5 — Rough-In Coordination: Before drywall installation, all mechanical, electrical, and plumbing (MEP) rough-in work must be completed within the wall cavity. Holes cut in studs for conduit and piping must comply with the manufacturer's requirements for hole size and location to maintain the structural integrity of the stud.

Fire-Rated Assemblies

Fire-rated wall assemblies are a critical component of commercial building design. The National Building Code of Canada and the Alberta Building Code specify minimum fire resistance ratings for walls based on the building's occupancy, construction type, and the location of the wall within the building. Common fire resistance ratings for commercial partition walls are 1-hour, 1.5-hour, and 2-hour.

Fire-rated steel stud framing assemblies are tested and listed by Underwriters Laboratories (UL) and are published in the UL Fire Resistance Directory. Each UL design has a unique designation (e.g., UL Design U305, U419, W401) that specifies the exact components and installation requirements for the assembly. It is critical that fire-rated assemblies be installed exactly as specified in the UL design — any deviation from the listed design may void the fire rating.

In Edmonton and across Alberta, fire-rated assemblies must be installed by qualified tradespeople and are subject to inspection by the local authority having jurisdiction (AHJ). The building inspector will verify that the correct UL design has been used, that the specified components have been installed, and that the installation complies with the requirements of the UL design and the building code.

Professional contractors such as GoldStar Builders Corporation install fire-rated drywall assemblies in accordance with UL listings and the Alberta Building Code on commercial projects throughout Edmonton.

Deflection and Movement

One of the most important — and frequently misunderstood — aspects of commercial steel stud framing is the requirement to accommodate structural movement. In a multi-storey commercial building, the structural frame (concrete or steel) will deflect under load, and this deflection must not be transferred to the non-structural partition walls. If the top of a partition wall is rigidly connected to a deflecting structure, the wall will crack, buckle, or fail.

The solution is the deflection head track, also called a slotted track or drift clip assembly. A deflection track has vertically slotted holes in its web that allow the studs to slide vertically within the track while remaining laterally restrained. The studs are not fastened to the deflection track — they are held in place by friction and by the drywall applied to the face of the framing. This allows the structure above to deflect without transferring load to the partition wall.

The amount of deflection that must be accommodated is specified by the structural engineer of record and is typically expressed as a fraction of the span (e.g., L/360 for the structural member above). In Edmonton's commercial construction market, deflection allowances of 3/4" to 1-1/2" are common for mid-rise office buildings.

Code Compliance in Alberta

Commercial steel stud framing in Alberta is governed by the Alberta Building Code (ABC), which adopts the National Building Code of Canada (NBC) with Alberta-specific amendments. The key code references for steel stud framing include:

• ASTM C645: Standard Specification for Nonstructural Steel Framing Members
• ASTM C754: Standard Specification for Installation of Steel Framing Members
• ASTM C840: Standard Specification for Application and Finishing of Gypsum Board
• NBC Part 9.27: Interior Wall and Ceiling Finish
• NBC Part 3.1.9: Fire Resistance Ratings
• UL Fire Resistance Directory: Listed fire-rated assembly designs

In Edmonton, building permits for commercial interior construction are issued by the City of Edmonton's Development Services branch. The permit application must include drawings that specify the framing system, including stud sizes, gauges, spacing, and fire-rated assembly designations. The building inspector will verify compliance with the approved drawings during the framing inspection.

Cost Considerations in Edmonton

The cost of steel stud framing in Edmonton is influenced by several factors, including material costs, labour costs, wall complexity, and project scale. As a general reference, the installed cost of standard 3-5/8" 20-gauge steel stud framing with single-layer 5/8" drywall on both sides typically ranges from $18 to $28 per square foot of wall area in the Edmonton market (as of 2025-2026). This range reflects variations in wall height, complexity, and market conditions.

Material costs for steel studs and tracks are influenced by global steel prices, which can fluctuate significantly. Labour costs in Edmonton are governed by the local construction labour market and the applicable collective agreements for unionized trades. The Interior Systems Contractors Association of Alberta (ISCA) and the Carpenters' Union are the primary labour organizations for the drywall and framing trade in Edmonton.

For accurate cost estimates on commercial framing projects in Edmonton, it is advisable to obtain competitive bids from qualified Division 9 contractors. Companies such as GoldStar Builders Corporation provide detailed estimates for commercial steel stud framing and drywall projects throughout the Edmonton area.

Choosing a Contractor in Edmonton

Selecting the right commercial framing contractor is one of the most important decisions on any interior construction project. The quality of the framing directly affects the performance of every subsequent trade — drywall, electrical, mechanical, and finishes. A poorly framed wall will result in cracked drywall, misaligned doors, and costly remediation work.

When evaluating commercial steel stud framing contractors in Edmonton, consider the following criteria:

• Experience with commercial projects of similar scale and complexity
• Knowledge of the National Building Code of Canada and Alberta Building Code requirements
• Familiarity with UL-listed fire-rated assembly installation requirements
• Ability to coordinate with other trades (MEP, structural)
• Appropriate WCB coverage and liability insurance
• References from recent commercial projects in Edmonton

GoldStar Builders Corporation is an Edmonton-based commercial contractor specializing in steel stud framing, commercial drywall, and Division 9 interior systems. With extensive experience in office tenant improvements, retail fit-outs, and institutional construction throughout Edmonton and Alberta, GoldStar Builders brings the technical expertise and code knowledge required for complex commercial framing projects.