Waterproofing Guide for Home Renovation

1. Why Waterproofing Is Essential in Renovation

Waterproofing protects your home from long-term damage caused by moisture, leaks, and seepage. Ignoring waterproofing during renovation can lead to expensive repairs later.

Major Problems Caused by Poor Waterproofing

Wall dampness and peeling paint
Ceiling leakage
Fungal growth and mold
Structural weakening
Bad odour and unhealthy indoor air

2. Signs Your Home Needs Waterproofing

Yellow or brown patches on walls
Paint bubbling or flaking
Cracks near windows or corners
Wet bathroom walls from the other side
Damp smell in wardrobes
Leakage from the ceiling during rain

If you see any of these signs, waterproofing is mandatory before renovation.

3. Waterproofing Areas to Cover During Renovation

Bathroom

Floor and wall joints
Shower area
Toilet base
Under tiles (tile-on-tile waterproofing)

Kitchen

Sink area
Backsplash and countertop joints
Wet floor zones

Balcony

Floor slope correction
Drain outlet sealing
Tile joints

Terrace / Roof

Surface cracks
Water ponding areas
Expansion joints

Basement (If Applicable)

Under-slab waterproofing
Side-wall waterproof coating

4. Top Waterproofing Methods Used in 2025

1. Liquid Membrane Waterproofing

Flexible coating applied with roller or brush
Best for bathrooms, terraces, balconies

2. Cementitious Waterproofing

Commonly used in bathrooms & wet areas
Easy to apply, durable and economical

3. Polyurethane (PU) Coating

Highly flexible and long-lasting
Ideal for complex surfaces and roofs

4. Bitumen Membrane

Used for large terraces and basement waterproofing
Heat-applied sheets for strong protection

5. Tile-on-Tile Waterproofing

Used during renovations without removing old tiles
Suitable for bathrooms and balconies

5. Best Waterproofing Materials for Indian Homes

Dr. Fixit 301, 302, 601
Asian Paints SmartCare Damp Proof
Fosroc Brushbond
MYK Laticrete Hydro Ban
STP Bituminous Membranes

Always ensure the contractor uses branded waterproofing materials with warranty.

6. Bathroom Waterproofing During Renovation

Bathroom waterproofing is critical because it is the wettest area of the home.

Steps for Proper Bathroom Waterproofing

Remove old loose tiles or apply tile-on-tile primer
Seal all wall-floor joints with waterproof tape
Apply 2–3 coats of liquid membrane
Ensure slope towards the drain
Test by water ponding for 24 hours

Never skip water testing—it prevents future leakage problems.

7. Terrace Waterproofing Solutions

Terrace leakage is one of the most common issues in Indian homes.

Recommended Methods

PU coating for maximum flexibility
Acrylic liquid membrane
Bitumen membrane sheet
Cementitious slurry for minor cracks

Surface cracks must be filled before coating to ensure long-term protection.

8. Tips to Avoid Waterproofing Failures

Ensure surface is clean and dry before application
Do not dilute waterproofing chemicals
Apply minimum 2–3 coats as recommended
Allow proper curing time
Never skip joint sealing
Always test waterproofing before tiling