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Waterproofing Solutions to Water Leakage on Balcony

Balcony slabs are constantly subjected to severe stress from heavy rain, intense heat, and thermal movement. Because of this relentless exposure, the waterproofing membrane quickly degrades, making balconies one of the most common sites for failure. If neglected, water leakage from this area poses a serious threat, causing damage to underlying walls, ceilings, and the structural integrity of your home.

Common Weak Spots, Where Leaks Start

Hairline cracks in tiles or deteriorated grout allow water to seep past the surface into the concrete slab. Over time, if the waterproofing layer fails or structural movement occurs, the water can penetrate further and cause leakage in the rooms below.

When the balcony drain is blocked or slow, water starts to pool around the outlet. Standing water puts pressure on weak areas of the waterproofing, allowing moisture to seep through and cause leaks.

The joint where the balcony floor meets the wall often develops small cracks or peeling sealant. These narrow gaps act as hidden pathways, allowing water to enter the structure and seep into the ceiling below.

Loose or rusty railing posts can open up tiny spaces around their screw holes. These holes easily collect rainwater, turning them into mini funnels that send moisture straight into the slab.

Worn caulking or gaps under the sliding door frame allow water to sneak inside. When the frame is misaligned or old, rainwater flows underneath and spreads into the indoor flooring.

Over time, the waterproofing layer beneath tiles can break down due to weather exposure and building movement. As it weakens, cracks will form, allowing water to seep into the structure and cause leaks. 

Signs & Causes of Water Leakage on Balconies

  • Water Stains on Walls or Ceilings

    Early signs of balcony water seepage appear as yellow, brown, or dark stains on walls or ceilings. Though they may seem cosmetic, they actually indicate moisture seeping through a failing waterproofing layer.

  • Peeling or Bubbling Paint

    Moisture is seeping in where the balcony connects to the main wall, saturating the wall materials and forcing the paint to lift and detach from the surface.

  • Fungus and Mould Growth

    Continuous water seepage promotes mould and fungus. Green, brown, or black patches on walls, often with a musty smell, indicate balcony leaks that can damage surfaces and pose health risks.

  • Efflorescence

    Efflorescence appears only when water moves through concrete or masonry, indicating ongoing water infiltration through porous grout or cracked sealants.

How ARCHTECH Solves Balcony Water Leakage

We provide a systematic, long-lasting solution that protects your property from leaks, mould, and structural damage. Here’s how we do it: 
  • 1

    Comprehensive Leak Detection & Inspection

    Our specialists conduct a thorough inspection of wet areas to identify water leaks and damage while minimising disruption to your property. Using advanced thermal cameras, we can accurately pinpoint the source of the leak, ensuring an effective, long-term solution that protects your home.
  • 2

    Crack Repair & Substrate Restoration

    We repair all cracks and reinforce weak areas immediately to make sure the surface is strong before we start waterproofing.
  • 3

    Application of ARCHTECH Waterproofing Solution

    Multiple waterproofing layers are applied to protect your area from leaks for years. Completion usually takes just 1 day depending on the size of the area.

The solution leaves your area fully sealed and dry, providing lasting protection against leaks and daily moisture.

Proven Waterproofing Methods for Your Balcony


Our balcony waterproofing begins with a thorough inspection of all leak-prone areas, followed by proven techniques tailored to your balcony’s structure. By using the right materials and long-lasting methods, we stop water leakage at the source and keep your balcony dry, safe, and protected for years.
In-House Specialist Expertise

We rely on our own certified experts for precise diagnosis and uncompromising quality workmanship, ensuring permanent repairs.

Comprehensive Leak Resolution

We have complete solutions to solve all types of water leakage at balcony areas across commercial, and residential buildings.

Unmatched System Versatility

We master all waterproofing methods or systems (PU Injection, Clear Coating, Liquid or Cementitious Membrane) and ensure using the right approach for your structure, guaranteeing a longer lasting solution.

Comprehensive 3-years Warranty for a Piece of Mind​

Our long-term warranty covers all flat roof waterproofing work, giving you confidence in durability and reliability of ARCHTECH’s leak-proof solution.

Our Past Projects

ARCHTECH Waterproofing has been trusted across nation wide, from hospitality developments and government facilities to large-scale engineering works and premium residential properties. Our solutions are engineered for long-term performance, backed by technical expertise at every stage of the project.

Torch-On Membrane
Waterproofing for The Mines Resort City Flat Roof
January 2, 2026•
Torch-On Membrane
Waterproofing for Sime Darby Flat Roof
November 12, 2025•
Clear Coating
Waterproofing Bathroom in Cyberjaya
November 12, 2025•
Clear Coating
Waterproofing for Toilet
November 12, 2025•

Can’t Describe the Leak? Just Show Us.

Send us a photo or video of the leak.

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Dealing with Balcony Leaks?

Tell us what you’re facing, whether it’s a leak, damp smell, mould stain or bubbling paint. You can also upload a photo for faster assessment. Our team will review your case and get back to you with a personalised solution and quotation.

Explore Our Comprehensive Range of Waterproofing Solutions for Other Areas

Discover how we protect every area of your property.

Car Porch
RC Slab Roof/ Flat Roof
Exterior Wall
HOW CAN WE ASSIST?

Frequently Asked Questions

Solutions include cleaning and repairing drains, sealing cracks, applying waterproof coatings or membranes, and ensuring proper slope for water runoff. Persistent leaks may require professional waterproofing.

Yes, it’s very likely. If the affected area is located directly below your balcony, and the adjacent car porch remains dry, it usually points to a leak coming through the balcony slab. Water can seep through cracks, degraded waterproofing, or joints near railing bases and spread into the ceiling below. Our technicians will inspect the exact location and confirm whether your balcony is the source of the problem.

Even if your tiles appear intact, water can still seep through cracked grout lines or gaps at the edges. If the waterproofing layer beneath has deteriorated, water will pass through the slab and leak into the room below. Our technicians will carry out a detailed inspection to identify hidden weaknesses and advise on the right fix.

Not necessarily. The repair method depends on the cause and condition of your balcony. In some cases, surface treatments may be possible, while others may require a more thorough repair. Our technician will recommend the most suitable approach after assessing your site.

That depends on the system used and the quality of workmanship. A professionally applied waterproofing system can last anywhere from 5 to 10 years or more with proper care. ARCHTECH provides a warranty for all our waterproofing work to give you peace of mind.