For terrace and flat roof leakage repair, modern techniques use elastomeric polyurethane or silicone-based coatings that expand/contract with temperature changes, preventing re-cracking. The process: pressure wash to remove dirt/algae, treat efflorescence, inject grout into deep cracks if needed, then roll/brush on fiber-reinforced waterproof membrane in 2–3 coats. This creates a full... https://shakuraconstruction.sg/services/roof-leakage-repair/