Recent Projects.

Cleopatra Restoration Group was engaged to undertake a large-scale commercial mould remediation project in Cairns following significant roof failure during Cyclone Jasper.

Water ingress from above impacted ceiling cavities, wall systems, and structural timbers throughout the facility. In total, 62 accommodation rooms, along with the restaurant and reception areas, were remediated as part of a structured program delivered over six weeks.

Due to the extent of contamination and required engineering controls, the building was fully shut down during remediation works to ensure safe, compliant, and effective delivery.

Project Complexity

• 62-room commercial accommodation facility
• Restaurant and front-of-house reception areas impacted
• Extensive ceiling cavity contamination
• Large-scale containment engineering required
• Multi-zone coordination with staged reinstatement

Remediation Strategy

The facility was divided into four engineered containment zones, allowing structured progression of works while maintaining strict contamination control.

This zoning strategy enabled:

• Controlled isolation of contaminated areas
• Progressive remediation and Third-party Post Remediation Verification (PRV) as each zone was remediated
• Staged handover to builders for reinstatement works one zone at a time, once cleared

Strict cross-contamination controls were maintained between remediation chambers and unaffected structural areas.

Engineering Controls & Air Management

Given the scale of the ceiling cavities and interconnected building design, air management was critical.

Multiple air strategies were assessed, including negative, neutral, and positive air systems.
Due to the configuration of the roof voids and structural framework, positive air pressurisation with calculated air changes per hour (ACH) proved most effective in achieving particulate control and remediation efficiency.

Controls included:

• HEPA Air Filtration Devices (AFDs)
• Engineered containment barriers (200um poly)
• Pressure differentials between zones
• Separation of disturbed and undisturbed areas

Remediation Methodology

All works were completed in accordance with ANSI/IICRC S520 (Professional Mould Remediation).

Key processes included:

• Initial removal of Condition 3 Mould Damaged porous materials
• HEPA abrasive sanding of upper structural timbers where required
• Application of Serum 1000 Hydrogen Peroxide to exposed timber frames
• Pre- and Final HEPA vacuuming of all surfaces
• Ongoing moisture monitoring and environmental stabilisation

Electrical services within contaminated areas were carefully coordinated with licensed trades to ensure safety and compliance throughout the project.

Post Remediation Verification

Independent third-party PRV testing confirmed all remediation zones met acceptable criteria for reinstatement.

Executive clearance status: Achieved

Project Outcome

• 62 rooms successfully remediated
• Restaurant and reception fully remediated
• Four engineered containment zones
• Six-week project duration
• Independent third-party clearance achieved

We thoroughly enjoyed working on this project and it demonstrates Cleopatra Restoration Group’s ability to deliver large-scale commercial mould remediation under complex conditions, applying engineered containment, advanced air management strategies, and strict industry compliance.