Waterproof Coating Solutions for Metal Roof

Metal roofing can provide a highly reliable and long-lasting solution, but leaks often occur due to compromised seams or loose fasteners caused by natural expansion and contraction. Corrosion and rust further weaken the roof over time. Without proper waterproofing, even the most resilient metal roofing materials can deteriorate prematurely, reducing their lifespan and performance.

Common Signs of Metal Roof Deterioration

Metal roofs are durable and long-lasting, but without proper waterproofing over time, these issues can compromise the roof itself and the structure beneath it, leading to costly repairs and a shortened lifespan.

Leaks at seams or fasteners

Water penetrates small gaps between metal sheets or around screws and joints.
Surface corrosion and rust

Moisture and environmental factors gradually eat away at the metal.
Discolouration and peeling coatings

Protective layers fade or peel, leaving metal exposed to the elements.
Structural damage

Water infiltration can weaken the roof framework and supporting building structures.
Mould growth and staining

Persistent moisture encourages mould and unsightly water stains on ceilings or walls below.

Waterproofing Your Metal Roof Against Harsh Weather

Metal roofs are strong and long-lasting, but in Malaysia’s extreme climate plus metal naturally absorbs and transfers heat, a non-insulated metal roof can quickly turn your interior space hot and stuffy, forcing air-conditioning to work harder.

By applying ARCHTECH Waterproofing to prevents leaks and rust. At the same time, your roof gains a protective layer that reduces heat absorption, improves indoor comfort, and helps lower energy usage throughout the year.

Recommended for Metal Roof Leak Prevention

Metal roofs face challenges such as leaks at screw points, rusting sheets, deteriorated sealants, and weather expansion. Proper waterproofing protects your property from costly interior damage and ensures long-term durability. Our solutions serve both proactive planners and those facing immediate leakage issues.

Homeowners, Shops & Commercial Units

Practical Protection

If your metal roof is severely aged or rusted, replacement is the most effective solution. ARCHTECH installs new metal roofing strengthened with a protective waterproofing layer that seals joints and penetrations, prevents future corrosion, and extends roof lifespan. Suitable for houses and shoplots, our systems deliver durable, weather-resistant protection against daily exposure and heavy rainfall.  

Industrial & Large-Scale Metal Roof Structures

High-Demand Performance

Industrial plants, warehouses, and facilities with large-span metal roofing require robust waterproofing to handle movement, vibration, and constant weather stress. ARCHTECH coating system is essential to prevent operational disruptions. We provides industrial-grade metal roof waterproofing designed to withstand harsh conditions, ensuring long-term protection and minimal maintenance.

Why Metal Roof Leaks Keep Coming Back

Repairs focus only on visible drip points

Leaks often appear at drip points, but the actual entry may be at seams, fasteners, or panels, so patching only the drips leaves the root cause untreated.

Sealant-only patch repairs are applied

Relying solely on sealants without proper membrane or coating integration can fail under thermal movement, exposing the roof to recurring leaks.

Roof movement is not properly addressed

Metal roofs expand and contract with temperature changes; if movement isn’t accounted for, cracks, gaps, and failed joints allow water to penetrate.

Existing roof condition is not fully assessed

Corrosion, panel deformation, or loose fasteners weaken the roof’s integrity, and repairs without a full assessment often fail quickly.

Waterproofing systems are incompatible with metal substrates

Some membranes or coatings don’t bond well to metal, leading to peeling, blistering, or inadequate coverage over joints and seams.

How Our Experts Identify & Fix Metal 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

Root Cause Inspection

Our specialist inspects the metal roof to identify the actual source of leakage. This includes assessing roof sheet condition, fasteners, joints, sealant integrity, drainage paths, corrosion, and signs of thermal movement before recommending any solution.
2

Surface Preparation & Repair

Once the cause is identified, necessary preparatory works are carried out. This may include fastener treatment, joint rectification, corrosion treatment, and surface preparation to ensure the roof is suitable for waterproofing application.
3

Waterproofing System Application

Based on the roof condition and movement characteristics, an appropriate waterproofing system is applied. This may include liquid-applied membranes, PU coating systems, or joint-specific treatments, selected to accommodate roof movement and exposure while reducing the risk of recurring leaks.
4

Detailing & Final Inspection

Critical detailing at joints, penetrations, and terminations is completed, followed by final inspection to ensure proper application before handover.

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

Long-Lasting Waterproofing for Your Metal Roof

Our metal roof waterproofing begins with a thorough inspection to identify all leak-prone areas, including panels, flashing, vents, and skylights. Using expert techniques tailored to the roof’s structure, we address leaks at the source and protect against rust and corrosion, ensuring it remains dry, secure, and reliable for years to come.

Certified and Experienced Applicators

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

Comprehensive Leak Resolution

We have complete solutions to tackle all types of water leakage on metal 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 5-years Warranty for a Piece of Mind

Our long-term warranty covers all metal 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.

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.

Metal Roof Leaking? We’ve Got You Covered.

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.

HOW CAN WE ASSIST?

Frequently Asked Questions

Does my entire metal roof need to be replaced to fix the leak?

Not always. In many cases, targeted repairs and proper waterproofing are enough to stop the leaks and extend the roof’s lifespan. Full replacement is only necessary if the damage is widespread or the roof structure is beyond repair. After inspection, we’ll recommend the most practical and cost-effective option.

Can leaking start from screw holes or roof fasteners?

Yes, this is one of the most common causes of metal roof leaks. Over time, screws may loosen due to movement or lose their washers, allowing rainwater to seep in. We inspect and replace faulty fasteners and reseal the area with weatherproof materials to stop the leak at its source.

What if water only leaks during heavy rain or strong wind?

This usually points to gaps or weaknesses at roof overlaps, flashing, or ridge areas. Water driven by wind can enter through small openings that don’t leak under normal conditions. Our specialists check these common leak zones and apply proper sealing systems to keep your roof watertight in all weather.

Is there a warranty for your metal roof leak repair work?

Yes. We provide a warranty for all our waterproofing and repair work, including metal roof systems. The warranty duration depends on the materials and method used, and we always explain this clearly before the job begins.

Can you fix metal roof leaks on commercial or industrial buildings?

Yes, we work on residential, commercial, and industrial metal roofing systems. Whether it’s a small porch, a factory roof, or a warehouse, we provide scalable waterproofing and leak repair solutions tailored to your building’s structure and usage.