The most common tactile ground surface indicator errors involve incorrect location, coverage, offset, orientation or luminance contrast. These problems often begin in incomplete drawings and become expensive once indicators are installed.
Because access requirements are project-specific, the correct answer depends on the building, proposed work, approval pathway and evidence available. This guide explains the practical questions to ask before making a decision.
Need advice on a live project? Request a fee proposal from ASN.
The key factors
- Whether warning or directional indicators are actually required at the location
- The relationship between indicators, hazards and the intended path of travel
- Set-back, depth, width, orientation and continuity
- Luminance contrast with the surrounding surface
- Coordination with stairs, ramps, crossings, kerbs, doors and transport boarding points
A qualified access consultant can help connect these factors to the relevant NCC provisions, Premises Standards, Australian Standards and project documentation. The review scope should identify the criteria being applied and any important limitations.
Common mistakes
Adding TGSIs as a late markup, using one generic detail everywhere, judging contrast by eye, installing directional indicators without a coherent route, or failing to inspect set-out before adhesives or studs are fixed.
These mistakes are easier to correct in drawings and project planning than after approval, procurement or construction. Early review also gives the architect, building surveyor, owner and contractor a shared record of the issue.
A practical way forward
- Resolve the accessible route and hazard treatment before detailing indicators
- Show dimensions and orientation clearly on coordinated drawings
- Confirm product and background luminance information before ordering
- Inspect samples and set-out early, then complete a focused pre-handover audit
What useful advice should contain
A useful assessment should state the purpose of the review, the documents or areas assessed, the applicable criteria, material findings, assumptions, exclusions and recommended next actions. It should be written for the people who need to resolve the issue, rather than simply reproducing clauses.
Where a design changes after the assessment, the affected access findings should be reviewed again. One altered doorway, level, fixture or route can affect connected parts of the accessibility strategy.
Relevant ASN service
ASN’s primary service for this issue is TGSI Compliance Audits. Access Solutions National has provided disability access and inclusion advice since 2002. Our consultants are qualified and Accredited Members of the Association of Consultants in Access Australia (ACAA).
Frequently asked questions
Should I wait until the design is complete?
No. Early advice usually provides more options and reduces the chance of redesign. The scope can be updated as documentation develops.
Does an access consultant replace the building surveyor?
No. The access consultant provides specialist advice. The building surveyor or relevant authority remains responsible for statutory approval decisions.
What should I send ASN?
Send the address, project description, current drawings or photographs, project stage, question to be answered and required date. ASN will confirm the appropriate service and scope.
Discuss your project
Request a fee proposal or call 1300 276 222 for practical disability access advice.