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Flat & Reinforced Concrete (RC) Roof Waterproofing Solutions

Roof water leakage is one of the most common waterproofing problems in Malaysian homes and buildings, especially on flat and reinforced concrete (RC) roofs as they are constantly exposed to rain, heat, and weathering. Our data reveals 51% of homeowners affected, rising to 90% in buildings due to their larger roof areas, prolonged exposure, and heavy reliance on robust drainage and waterproofing systems.

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 ponding water remain on the roof for over 48 hours due to poor drainage, insufficient slope, or structural defects, it stresses the waterproofing membrane and speeds up its deterioration. Ultimately this contribute to leaks over time.

Shifting or cracking in the roof deck caused by structural movement from foundation settlement, thermal expansion, moisture changes, or even overloading can tears the waterproof membrane above it, allowing water to seep through and cause internal leaks.

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.

Why Flat & RC Roof Leaks Keep Coming Back

On flat and RC roofs, water often travels beneath screed layers or membranes, meaning the visible crack is rarely the true source of the leak.

Flat and RC roofs are prone to ponding water, and systems not designed for constant water exposure can deteriorate, blister, or lose adhesion.

Dusty concrete, residual moisture, or weak screed on RC roofs prevents proper bonding, leading to membrane lifting and early failure.

Critical areas such as expansion joints, rainwater outlets, and parapet upturns are common failure points when not correctly detailed.

Leaks on flat and RC roofs often originate far from where water appears, and without proper investigation, repairs fail to address the root cause.

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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 begins by inspecting the roof to identify the actual source of leakage. Using visual assessment and advanced thermal detection tools where applicable, we evaluate water ponding, surface condition, existing waterproofing layers, drainage points, and structural movement before recommending any solution.
  • 2

    Preparation And Repair

    Once the cause is identified, necessary surface repairs are carried out. This may include crack treatment, rectification of weak or damaged areas, and surface preparation to ensure the roof is structurally sound and ready for waterproofing.
  • 3

    Apply Primer

    A suitable primer is applied to the concrete surface to enhance adhesion between the substrate and the waterproofing system, ensuring consistent performance and durability.
  • 4

    Install Membrane 


    This may include systems such as torch-on membranes or liquid-applied membranes, selected to suit ponding conditions, movement, and long-term performance requirements.

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.
Certified and Experienced Applicators

All of our applicators are trained and experienced in handling flat and RC roof waterproofing works.

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. 


Lab-Tested and Certified Materials

We use materials that have been tested and certified to meet relevant performance and quality standards.

Green Label Products

We use low-VOC, environmentally responsible products to support safer indoor and surrounding environments.

Comprehensive 10-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 30, 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 a photo or video of your leak, and let our waterproofing specialist assess the situation so you don’t spend on wrong repairs.

Whatsapp Us for a Free Advice

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. 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.