For internal wall water leakage repair, professionals use non-destructive methods to stop dampness from rising or lateral seepage. Common in bathrooms or shared walls, the process includes drying the area, injecting grout into deep cracks if needed, applying cementitious waterproof slurry (e.g., Pidiproof LW+ mix), and finishing with damp-proof putty plus breathable paint. Exterior-si... https://shakuraconstruction.sg/services/water-leakage-wall-repair/