MJ Engineering Projects supervised remedial works on a concrete-frame, brick-infill building in Pymble. The structure, supported by four principal columns and standing three floors high, suffered water ingress through planter boxes and balconies, delaminated render, non-conforming aluminium balustrades and concrete spalling. Our client required a cost-effective programme that would restore weather tightness, rectify structural defects and preserve resident amenity.
Project background
Inspection confirmed that failed balcony and planter-box membranes allowed moisture into the façade, accelerating render delamination and reinforcing corrosion. Aluminium balustrades installed during a past refurbishment did not meet current safety requirements. Concrete elements across the elevations showed early signs of spalling. MJ Engineering Projects documented the findings, produced a remedial works specification aligned with the National Construction Code and ran a selective tender. A specialist contractor was appointed, and our team acted as superintendent to certify quality and progress while the building remained occupied.
Scope of works
- Waterproof planter boxes
- Repair façade render defects
- Recoat exposed concrete elements
- Remove and replace balcony balustrades
- Retile and waterproof balconies
- Render slab edges with Quick-Wall
- Apply low-sheen acrylic paint to façades
- Repair construction joints
- Apply sealant to movement joints and penetrations
Key challenges and solutions
Planter-box waterproofing
Persistent leaks originated in planter boxes. Damaged membranes were removed, substrates cleaned and a new sheet system installed up the walls and over drainage fittings. Root repellent grade membranes now shields the membrane from root damage, ensuring long-term service.
Balcony remediation
Balcony toppings were stripped to expose concrete. A flexible membrane was applied, followed by a grout-bonded screed laid to new falls. Porcelain tiles with slip resistance completed the finish, restoring practical outdoor space and preventing further seepage.
Concrete spalling
Carbonation and moisture had started to corrode reinforcement. Loose concrete was broken out, steel treated and polymer-modified mortar reinstated cover. A high-build acrylic coating then sealed the repaired areas and adjacent concrete.
Non-compliant balustrades
Existing aluminium rails did not satisfy current load clauses. New powder-coated aluminium balustrades were fitted, achieving the required crowd-load capacity and integrating with the refreshed façade.
Render and coating integration
Delaminated render sections were cut back, re-keyed and built out with Quick-Wall mortar. Low-sheen acrylic paint applied to both new and existing surfaces now provides uniform colour and enhanced UV protection.
Conclusion
The Pymble remedial works programme resolved water ingress, repaired concrete spalling and upgraded safety elements without exceeding budget or schedule. Planter boxes and balconies are fully waterproofed, façade render is secure, balustrades meet current standards and fresh coatings protect and enhance building appearance.
MJ Engineering Projects combines more than twenty-five years of remedial works experience with attentive project supervision. For additional case studies visit our blog or contact the remedial works team for guidance on balcony membranes, concrete repair and façade maintenance.
