Waterproofing Integrity were engaged to address multiple waterproofing, drainage, and concrete deterioration issues on a residential balcony remediation project on Sydney’s Northern Beaches.
The project involved developing a compliant and buildable waterproofing strategy for a full balcony demolition and reconstruction where existing waterproofing failures, drainage limitations, and concrete spalling issues required complete remediation works.
Key Issues Identified
- Non-compliant surface falls
- Non-compliant waterproofing upturn heights
- Waterproofing detailing inconsistencies
- Drainage limitations within the original construction
- Concrete spalling and substrate deterioration
- Water ingress contributing to concrete and reinforcement deterioration
- Interface coordination between new and existing construction elements
- Architectural finish requirements requiring compliant integration with the waterproofing system
Waterproofing Integrity Scope
Waterproofing Integrity collaborated with engaged architects, engineers, and builders to develop a coordinated waterproofing remediation strategy for the Strata Title, aligned with the proposed balcony reconstruction works and the architectural design intent.
Services Included
- Visual inspections and situation reporting
- Surface fall assessment
- Waterproofing upturn and termination review
- Assessment of concrete deterioration and affected balcony areas
- Screed depth and drainage assessment
- Review of reconstruction build-up requirements
- Waterproofing strategy coordination
- Remediation detailing support
- Coordination of compliant waterproofing interfaces and drainage outcomes
Solution Delivered
A complete balcony waterproofing remediation strategy was developed as part of the demolition and reconstruction works to achieve compliant waterproofing and drainage performance while addressing the deteriorated concrete structure.
The remediation strategy included:
- Full balcony demolition and reconstruction
- Removal of deteriorated and affected concrete areas
- Coordination of concrete rectification works associated with spalling conditions
- Reconfigured surface falls to improve drainage performance
- New compliant waterproofing upturn detailing
- Tile-on-pedestal system to achieve flush threshold transitions
- Drainage solution through open tile joints
- Waterproofing detailing integrated with the reconstructed balcony system
- Manufacturer-aligned detailing to support waterproofing system compatibility and long-term performance
- Performance-based detailing developed to improve waterproofing continuity across critical interfaces
Project Outcome
✔ Achieved compliant waterproofing and drainage outcomes through complete balcony reconstruction
✔ Addressed concrete spalling and substrate deterioration associated with ongoing water ingress
✔ Improved surface drainage performance and waterproofing continuity
✔ Delivered coordinated waterproofing detailing integrated with the reconstructed balcony system
✔ Maintained architectural aesthetics and design intent
✔ Mitigated ongoing waterproofing risk associated with the original non-compliant construction
✔ Developed waterproofing detailing to mitigate membrane and drainage performance failures
✔ Assisted in minimising future rectification requirements through coordinated remediation detailing and compliant reconstruction works
✔ Delivered a practical and buildable waterproofing solution aligned with project stakeholder and manufacturer requirements