A BIM coordinator in Manila, Pune, or Ho Chi Minh City who studied engineering or architecture was trained on ISO drawing standards. ISO 128 for line conventions. ISO 7200 for title block layouts. The global standard is comprehensive, well-documented, and internationally recognised.
It is also not what Australian firms use.
The AS 1100 Framework
Australia's technical drawing standard is AS 1100, published by Standards Australia. It covers the same ground as the ISO standards but with Australian-specific conventions that differ in ways significant enough to cause documentation errors when offshore professionals apply their ISO training to Australian projects.
Line Weights and Types
AS 1100 specifies a different hierarchy of line weights than ISO 128. The specific thicknesses and their application in architectural versus structural versus services drawings follow Australian practice conventions that are not identical to ISO conventions. On a simple floor plan, the difference may not be visible to a non-expert. In a complex mixed-use coordination set, line weight errors create legibility problems that slow review time.
Title Block Format
Australian title blocks follow AS 1100.101 conventions that specify the placement and required fields differently from ISO 7200. More significantly, the revision history format — how drawing revisions are noted, dated, and signed off — follows AS 1100 conventions that differ from both ISO and US practice. A drawing produced for an Australian project with a non-conforming title block format will be returned at the documentation review stage of most major projects.
Scale Notation
The notation convention for drawing scales in AS 1100 differs from ISO conventions. The format for expressing scales (1:100 vs 1/100 vs Scale 1:100), the placement on the drawing, and the convention for "not to scale" notation are all specified in AS 1100 and taught differently in different countries.
Dimensioning Standards
AS 1100 dimensioning conventions — the format for chain dimensioning, overall dimensions, and reference dimensions — follow Australian practice. The specific rules for when to use chain vs coordinate dimensioning, and how to dimension across breaks, differ from ISO 129 conventions in ways that create errors in structural and civil documentation.
Symbol Libraries
Architectural symbols in Australian practice follow conventions not always encoded in global symbol libraries. The representation of door swings, window types, sanitary fixtures, and structural elements in Australian working drawings follows AS 1100 conventions that an ISO-trained professional will not always match correctly from memory.
What This Means for Offshore Teams
The discrepancies are not insurmountable. They are learnable. The problem is that the learning usually happens through error — a drawing is rejected at review, or a project manager notices the title block is wrong, or a structural engineer has to re-annotate a set of documentation because the dimensioning is not AS-compliant.
Structured pre-employment training on AS 1100 is not common in the offshore AEC workforce. It is one of the core modules in the AEC Labs Foundation curriculum for this reason: it is a learnable difference, it matters on every project, and it is better learned before the first day than discovered after the first documentation issue.
