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Waterproofing Solutions to Water Leakage at Flat Roof

A look at public buildings in the Klang Valley shows that flat roofs often have water pooling and small cracks. Flat roofs caused about 2.6% of all leaks checked, and concrete flat roofs had 14 different types of problems. From 64 repair projects in western Malaysia since 1994, common issues were old roof membranes and failed coatings, made worse by the hot and humid weather.

Why Do Flat Roofs Often Have Water Leakage Problems?

Malaysia’s weather is becoming increasingly unpredictable, from intense tropical downpours exceeding 250 cm of annual rainfall to rising urban heat stress where temperatures can reach 45°C in city centers like Kuala Lumpur. These harsh conditions place tremendous pressure on flat roof structures. At ARCHTECH Waterproofing, our high-performance flat roof solutions are engineered to withstand these extreme climate challenges, ensuring long-term protection, structural durability, and complete peace of mind.

1-2 Days

Average Rain Interval

45°C

Peak Temperature

KL

Urban Heat Island (UHI)

Heat from the greenhouse effect causes flat roofs to expand during the day and contract at night. This constant movement can create cracks and damage waterproofing, allowing water to seep in and eventually cause leaks and roof problems.

The Greenhouse Effect

Primary Climate Driver

Signs & Causes of Water Leakage on Flat Roofs

When water stays on the roof for more than 48 hours due to poor drainage or insufficient slope. This increases pressure on the membrane and can lead to leaks over time. Water standing for over 48 hours accelerates membrane breakdown due to poor drainage or structural defect, affecting over 30% of high-rise defects in Kuala Lumpur.

Shifting or cracking of the roof deck beneath the membrane, which tears the waterproof layer above it. When this happens, the waterproof layer on top can tear or come loose, letting water seep through and cause leaks inside the building. 


When extra structures (air conditioners, pipes, or antennas) are added to a flat roof, or when repairs are done incorrectly, they can damage the waterproof layer. Holes, gaps, or poorly sealed areas let water seep in, causing leaks inside the building.

How Our Expert Identifies & Fixes Flat Roof Leaks

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

    Inspect The Root Cause Of The Leakage

    Our specialist first inspects the wet areas to find water leaks and damage while ensuring minimal disruption to protect your property.
  • 2

    Preparation And Repair

    We use advanced thermal cameras to accurately find the exact source of the leak, ensuring a long-term solution.
  • 3

     Apply Primer

    We repair all cracks and reinforce weak areas immediately to make sure the surface is strong before we start waterproofing.
  • 4

     Install Membrane 


    One of our solutions is the Torch-on Membrane. We will apply a primer to the concrete surface to ensure optimal adhesion for the membrane during the next step.

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

Durable, Reliable, and Tested Waterproofing for Flat Roof

Our flat roof waterproofing approach combines precise assessment, expert application, and systems designed for each building’s structure. By selecting the right materials and techniques, we deliver lasting repairs that ensure superior protection and long-term performance against water leaks.
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 tackle all types of water leakage on flat roofs, serving industrial, commercial, and residential buildings with lasting results. 


Unmatched System Versatility

We master all waterproofing systems, including torch-on, liquid, and cementitious membranes, ensuring a long lasting protection against flat roof leaks. 


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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Need a Fix for Flat Roof Leakage?

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.

Metal Roof
Exterior Wall
Car Porch
HOW CAN WE ASSIST?

Frequently Asked Questions

Waterproofing is a process that prevents water from seeping into unwanted areas like walls, floors, and ceilings. In Malaysia’s humid and rainy climate, waterproofing helps protect buildings from leaks, dampness, mould, and long-term structural damage.

Waterproofing should ideally be done before construction or renovation, especially before installing tiles or finishes. This ensures a strong protective layer that prevents future leaks and damage.
If the project is already completed or the area is currently occupied, our hack-free waterproofing solution can still be applied after construction or renovation, without removing tiles or disrupting daily activities.

No, our waterproofing solutions are completely hack-free and do not require removing your existing roof surface. We use advanced coating and membrane technologies that seal leaks effectively without major demolition or disruption. This method is clean, fast, and long-lasting, ideal for both residential and commercial buildings where minimising downtime and mess is important.

If you notice water stains on your ceiling, damp patches after rain, or peeling paint indoors, it’s a clear sign that your flat roof waterproofing system has deteriorated. Simply applying patchwork or sealant won’t solve the problem in the long run.
You should engage our professional waterproofing inspection to identify the exact source of the leak. Our hack-free waterproofing solution can restore and seal the affected roof area without removing existing finishes, providing a fast, clean, and durable repair, ideal for both residential and commercial properties.

Yes, regular maintenance is necessary. Over time, weather exposure can cause grass and weeds to grow, dirt to accumulate, and hairline cracks to form. Maintaining the waterproofing every 3 years helps ensure continued protection and prevents minor issues from developing into leaks.Book an inspection with us today! Our professional team will help keep your waterproofing in optimal condition and protect your property for years to come.