Overview: Our waterproofing efforts at the Embassy of Indonesia involved complex challenges due to the age of the structure and existing water damage. Extensive restoration and sealing were prioritized to preserve the building’s integrity and ensure watertight protection.

Observations:
1. Multiple Leak Points: Historical water damage led to several weak areas across the roof, especially near expansion joints.
2. Deteriorating Surface: The rooftop’s concrete was highly porous, which required enhanced treatment for durability.
3. Failed Previous Treatments: Prior waterproofing layers were incompatible, requiring careful removal.

Corrective Measures:
1. Roof Flooding: Created a containment area and filled it with water to simulate rain conditions, allowing us to identify weak points.
2. Grout Injection: Applied flexible PU injections for primary sealing, followed by a secondary water-based grout for additional adhesion.
3. Joint Sealing: Sealed control joints using PU elastomeric sealant to allow for thermal movement.
4. Top Screed Replacement: Replaced the concrete screed with polymer-modified mortar for added strength, incorporating drainage outlets and slope adjustments.

Conclusion: The tailored waterproofing and joint repair solutions effectively addressed the Embassy of Indonesia’s unique requirements, ensuring resilience against environmental challenges and water damage.

Environmental Considerations: Given the embassy’s sensitivity to historical preservation, all materials were chosen to be compatible with the building’s age, minimizing the risk of chemical damage.
Long-Term Durability: The polymer-modified mortar used in screed replacement increases surface resilience, ensuring it can handle fluctuations in climate and traffic.
Maintenance Plan: Scheduled inspections every six months are advised to check joint stability and address potential issues proactively.
Enhanced Drainage: Improved drainage outlets ensure rapid water dispersal during heavy rain, reducing stress on the waterproof layer.