Cause of Leakage

• Cracks on the top surface of slab-Injection grouting as required, large cracks repair with URP modified mortar
• Cracks on the bottom of slab due to excess deflection of slab-Structural consultant's opinion must be taken; if leaking can be addressed with a hydrophobic PU foam injection grout
• Cracks at column supports-Structural consultant's opinion must be taken
• Excess porosity in the slab, bad quality concrete-Resort to Injection grouting
• Expansion joint in the slab-Polysulphide sealant application with proper detailing
• Inadequate design of the slab-Structural engineers opinion
• Spalling of concrete due to corrosion in the slab-Detailed repair with catholic protection & repair materials
• Cracks due to differential settlement of a building-structural and soil experts opinion must be taken

• Slope not proper-Slope must be provided for water drainage
• Inadequate rain water pipes-Provide drain water pipes as required
• Parapet wall not in good condition-Repair parapet masonry/plaster using mortar added with w/p compounds/polymer bonding agents
• Internal cracks, honeycombs (finished with ordinary mortar), porosity, etc. which cannot be seen by eye-pack using inject grout at the place of leakage from top to bottom
• Mechanical installations like cooling towers, AC units, etc., on the terrace-Foundations must be examined and repaired if required
• Aggressive climatic conditions-choose and apply protective coating/WP system
• Thermal extremes-Provide insulation treatment over WP layer.