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Light Gauge Steel (LGS) - Shop Drawings & Detailing

LGS shop drawings are the primary interface between the structural design and the fabrication floor. A well-prepared shop drawing set eliminates ambiguity at the roll-forming line, gives the erection crew a clear setting-out reference, and ensures that the as-fabricated frame matches the structural engineer’s design intent.

We prepare LGS shop drawings for both design-and-detail engagements (where we have also carried out the structural design) and as a standalone detailing service working from a structural engineer’s design drawings and calculations.

Drawing Preparation Process

Design Coordination & Clash Review

Prior to commencing detailing, we review the architectural and structural drawings for LGS coordination issues. Common items include header depth conflicts with floor-to-ceiling height requirements, stud spacing incompatibilities with cladding or lining module, opening framing requirements not reflected in the architectural set, and bearing conditions at cassette ends that require specific detailing. These are raised with the relevant parties before drawing preparation begins rather than resolved unilaterally during detailing.

Panel Layout & Identification

Each wall panel, floor cassette, and roof truss is assigned a unique mark number that appears on both the individual drawing sheet and the erection plan. Panel orientation, storey level, and gridline references are consistent across all drawing sheets. Where panels are mirrored or repeated, this is noted on the drawing with a clear indication of the reference panel.

Member and Fastener Detailing

Stud and track sections are identified by section designation and BMT on each panel drawing. Screw patterns at stud-to-track connections, web stiffener locations, and strap tie positions are dimensioned and specified. Opening framing details including king and jack stud quantities and header section designation are shown on the panel elevation. Non-standard details are drawn separately and cross-referenced from the panel sheet.

Drawing Issue

Drawings are issued in PDF for approval and DXF/DWG for fabrication use. Where the fabricator’s roll-forming software supports direct import, we can structure the DXF output to suit. Drawings carry a revision register, drawing status (e.g. Issued for Review, Approved for Fabrication), and the issuing engineer’s details.

Drawing Scope

  • Wall panel elevation drawings — all load-bearing, bracing, and external panels
  • Floor cassette layout drawings — joist layout, bridging, trimmer framing, and penetration details
  • Roof truss drawings — individual truss sheets and roof layout plan with truss spacing and bearing locations
  • Erection and setting-out plans — panel placement, mark numbers, hold-down locations, and level datums
  • Non-standard connection details — drafted separately and cross-referenced
  • Material and cut schedule — BOM by panel, by level, and for the project total

Deliverables Summary

Deliverable

Format

Content

Wall panel drawings

DWG, PDF

Full panel elevations with stud designation, spacing, opening framing, and boundary member callouts

Floor cassette drawings

DWG, PDF

Cassette layout with joist mark, span, bridging rows, and web stiffener locations

Roof truss drawings

DWG, PDF

Individual truss geometry, member designation, camber, and cut-length schedule

Erection plan

PDF

Panel placement keyed to mark numbers, bearing locations, hold-down anchor positions, and installation sequence

BOM / cut schedule

XLSX

Section designation, base metal thickness, cut length, quantity, and mass per panel and per level

 

Applicable Standards

  • AS/NZS 4600:2018 — Cold-Formed Steel Structures
  • NASH Standard: Residential and Low-Rise Steel Framing
  • AS 1100.101 — Technical Drawing: General Principles
  • AS 1100.201 — Mechanical Engineering Drawing
  • NCC 2022 — structural framing provisions
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