Terrace & Roof Waterproofing in Mumbai

• Damp patches or stains on the top-floor ceiling after rain
• Water still ponding on the terrace a day after the rain stops
• Cracks in the terrace surface, screed or along the parapet
• Paint peeling or bubbling on the ceiling below
• Leaks around rainwater outlets, pipes or AC stands
• Plants or moss growing in joints and cracks

1.Poor slope to the outlets

If the terrace doesn't fall toward its drains, water sits on the surface and finds every weak point.

2.Heat and movement

Daily heating and cooling makes concrete and screed expand and contract until it cracks.

3.Failed brickbat coba or old coatings

Traditional brickbat coba cracks and absorbs water with age, and coatings break down under sun and foot traffic. Once water gets underneath, it spreads through the slab.

4.Weak junctions and penetrations

Where the floor meets the parapet, and around pipes and outlets, unsealed joints are the most common way in.

• Liquid-applied polyurethane (PU) membrane

  A seamless, elastic coating that bridges hairline cracks and moves with the slab. UV-stable topcoats keep it working in direct sun.

  Best forExposed terraces with light foot traffic

• Heat-reflective elastomeric acrylic

  A flexible coating in a light, reflective finish that lowers surface temperature as well as keeping water out.

  Best forRoofs where top-floor heat is also a problem

• Modified bitumen (APP/SBS) sheet membrane

  Torch-applied or self-adhesive sheets with lapped seams, usually protected by a screed or tiles.

  Best forLarge roofs and terraces that will be tiled over

• Polymer-modified cementitious coating

  A breathable, cement-based waterproofing layer applied under new tiles or screed.

  Best forTerraces being re-tiled

What you get

• Dry rooms belowWater is stopped at the surface, before it soaks into the slab and the ceiling under it.
• A protected slabKeeping water out of the concrete protects the steel reinforcement from rust and spalling.
• Cooler top floorsReflective finishes can noticeably reduce the heat coming through the roof.
• A usable terraceWalkable topcoats, or tiles over the membrane if you use the space heavily.

1. 1

   Inspection and mapping

   We check slope, outlets, cracks, junctions and the ceiling below, and take moisture readings.

2. 2

   Surface preparation

   Cleaning, removing loose screed or failed coatings, and grinding where adhesion needs it.

3. 3

   Repairs and detailing

   Cracks opened and filled, coving built at the parapet, outlets and pipes collared.

4. 4

   Membrane application

   Primer, reinforcing fabric at weak points, then the membrane in the specified number of coats.

5. 5

   Topcoat or protection

   A UV-stable topcoat, reflective finish, or screed and tiles, depending on the system.

6. 6

   Flood test and handover

   Where the terrace allows it, we hold water on it to prove the work, then hand over with care instructions.

• Terrace area and shape
• Condition of the existing surface, and whether old tiles or coatings must come off
• Slope correction needed for proper drainage
• The system chosen and its thickness
• Number of pipes, outlets and other details to seal
• Access and material handling to the roof

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