How to Fix Wall Dampness in Mumbai Homes

3 min read

25 Dec

25Dec

Wall dampness is one of the biggest problems faced by Mumbai homes, especially during monsoon. High humidity, heavy rainfall, old buildings, sea air, and poor waterproofing cause seepage, peeling paint, fungus, and structural damage.In this expert guide by ApnaPainter.in, you’ll learn:

Why wall dampness happens in Mumbai
Permanent solutions (not temporary fixes)
Cost-effective waterproofing methods
How professionals fix damp walls
Why ApnaPainter.in is Mumbai’s trusted damp-proofing brand

Why Wall Dampness Is So Common in Mumbai?

Mumbai’s climate and construction style make homes vulnerable to dampness.

Main Causes of Wall Dampness

Heavy Monsoon Rainfall – Continuous rain causes seepage through cracks
High Humidity (70–90%) – Traps moisture inside walls
Old Buildings & Cracks – Especially in societies 15–30 years old
Poor Waterproofing – Low-quality paint or skipped waterproof layers
Bathroom & Kitchen Leakage – Internal seepage spreads to bedrooms
Sea Breeze & Salts – Coastal areas like Bandra, Colaba, Worli

Common Signs of Damp Walls (Don’t Ignore These)

Peeling or bubbling paint
White salt patches (efflorescence)
Black fungus or green algae
Musty smell in rooms
Wall plaster falling off
Cold, wet wall surface

⚠️ Ignoring dampness can damage walls permanently and cause health issues like allergies and asthma.

Best Ways to Fix Wall Dampness in Mumbai Homes

1. Identify the Exact Source (Most Important Step)

Professional inspection is crucial:

External wall seepage
Internal plumbing leakage
Roof slab leakage
Bathroom / kitchen seepage

👉 Wrong diagnosis = wasted money

2. External Wall Waterproofing (Permanent Solution)

Best for buildings exposed to rain.Process:

Crack filling
Waterproof chemical coating
Elastomeric exterior paint

Best for: Society buildings, high-rise apartments, sea-facing homes

3. Internal Wall Damp Treatment

Used when seepage is from inside walls.Steps:

Remove damaged plaster
Anti-damp chemical coat
Waterproof cement slurry
Re-plastering & repainting

4. Bathroom & Kitchen Waterproofing

Most common cause of bedroom dampness.Professional Solution Includes:

Tile removal (if required)
Polymer waterproofing membrane
Grouting & sealing
Re-tiling or painting

5. Roof Slab Waterproofing (Top Floor Homes)

Essential for terrace flats.Methods Used:

PU waterproof coating
Brick bat coba
Elastomeric membrane

6. Anti-Fungal & Anti-Algae Treatment

Stops black mold permanently before repainting.

Why Normal Paint Will NOT Fix Damp Walls

❌ Painting over damp walls hides the problem temporarily

❌ Dampness returns in 3–6 months

❌ Fungus grows underneath✅ Waterproofing + damp treatment is the only permanent solution

Damp Proofing Cost in Mumbai (Approx Estimate – 2025)

Area	Approx Cost (₹/sqft)
Internal Damp Treatment	₹70 – ₹120
External Waterproofing	₹90 – ₹180
Bathroom Waterproofing	₹25,000 – ₹60,000
Terrace Waterproofing	₹120 – ₹250

📞 Exact cost depends on site condition – FREE inspection available