Is your metal roof leaking, or showing rust, stains, and water marks inside your building?
Singapore’s heavy rain and intense heat hit metal roofs hard every single day. Without proper waterproofing, small problems become big, expensive ones very quickly.
Allseal is a BCA-registered, BizSAFE-certified metal roof waterproofing specialist in Singapore. We stop the leak, protect your roof, and make it last
There are many waterproofing contractors in Singapore.
So why do homeowners, factory owners, and commercial property managers keep coming back to Allseal?
Here’s the straight answer.
Yes, both. And here’s simply why that matters to you.
BCA registered means our materials and methods meet Singapore’s official building standards. Your MCST, insurer, or building management will accept our documentation without any issue.
BizSAFE certified means our team follows proper safety practices, especially important for metal roof work, which is done at height and in hot conditions. You don’t want a contractor cutting corners on safety at your property.
Over 15 years.
In that time, we’ve waterproofed metal roofs on warehouses, factories, landed homes, commercial buildings, and industrial facilities all over Singapore. We’ve seen every type of metal roof problem, and we know exactly how to fix each one properly.
Yes, free, no obligation, same-day response available.
Our specialist visits your property, checks the full roof condition, identifies every problem area, and gives you an honest written recommendation. No pressure to proceed.
Most people only call us when the roof is already leaking. By then, the damage inside the building had already started.
Let’s explain what’s actually happening to your roof and why acting early always saves money.
Metal roofs are strong, but Singapore’s weather is tough on them. Every day, your roof faces heavy tropical rain, intense UV heat, and high humidity. Over time, this causes:
Once any of these happen, water ingress begins, and water getting into your building through the roof causes ceiling damage, mould, damaged stock, and electrical hazards.
A proper waterproofing system seals all of these weak points and stops water before it gets in.
A small leak today becomes a big problem fast. Here’s the simple reality
Timeline | What Happens |
Early stage | Small rust spots, minor seam gaps, first signs of water marks |
3–6 months | Water ingress starts, ceiling stains appear inside |
6–12 months | Rust spreads, insulation gets wet, and mould starts growing |
1–2 years | Structural metal sheets weaken, major repair or full replacement needed |
Your roof doesn’t just fail overnight.
It breaks down slowly, and Singapore’s climate speeds that process up more than most people realise.
This is the most common problem we see on metal roofs in Singapore.
Galvanised steel and zinc-aluminium roofs are treated to resist rust, but that protection wears down over time. Once moisture gets through the coating, rust forms underneath. Rust weakens the metal, creates holes, and completely destroys the waterproofing layer above it.
Signs of rust and corrosion problems:
Metal roofs are made of many sheets joined together at seams. Over years of thermal expansion and contraction – the daily heating and cooling cycle in Singapore’s climate – these seams loosen. Fasteners work loose. Gaps open up.
Water doesn’t need a big gap. Even a 1mm opening along a seam lets rainwater in during Singapore’s heavy monsoon rains.
This is why seam sealing and fastener treatment are always part of our waterproofing process, not an optional extra.
If your roof has a low slope or blocked drainage, rainwater collects and sits in puddles. This is called water ponding. Standing water on a metal roof:
If you have ponding problems, fixing drainage must go alongside waterproofing – one without the other won’t hold.
Singapore’s UV radiation is intense year-round. Over time, it breaks down the surface of any protective coating, making it brittle, cracked, and no longer waterproof. This is sometimes called membrane fatigue – the coating has simply been worn out by years of sun exposure.
The good news: catching this early means a simple recoat fixes it. Leave it too long, and you need full surface treatment before any new coating will bond properly.
We work on all types of metal roofs across Singapore:
Each roof type has different seam profiles, fastener arrangements, and coating requirements. We assess your specific roof and recommend the right system – not a one-size-fits-all approach.
Different problems need different solutions.
Here are the details of the main methods we use.
This is the most common waterproofing solution for metal roofs in Singapore. An acrylic or elastomeric coating is applied directly over the cleaned metal surface, forming a flexible, seamless waterproof barrier that moves with the metal as it expands and contracts.
Why it works well:
Typical lifespan: 8–12 years with proper maintenance
This is often described as a metal roof coating in Singapore – it’s the standard solution for most residential and commercial metal roofs here.
For selected metal roof structures – particularly flat or very low-pitch sections – a torch-applied bituminous membrane or liquid membrane system can be used to provide a heavier-duty waterproof layer.
This is typically used when:
This is the same proven membrane technology used in flat roof waterproofing projects – applied to metal roof sections where extra protection is needed.
For roofs with active leaks at seams, joints, or fastener points, we use PU grouting and joint sealing – injecting flexible polyurethane sealant directly into the gap or crack.
This stops active water ingress immediately and provides a flexible, long-lasting seal that moves with the metal without reopening.
For crack injection repair along seams and joints, we clean the area thoroughly, inject the sealant under controlled pressure, and finish flush with the surrounding surface before the coating is applied over the top.
Here’s exactly what happens from start to finish so you know what to expect.
Step 1
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We work on metal roofs across all property types in Singapore, from small home car porches to large industrial warehouses.
Here’s a quick look at who we help and what we do for each one.
Factories, warehouses, logistics hubs, and industrial buildings across Singapore have large metal roof areas that are expensive to replace but straightforward to waterproof if caught in time.
For commercial and industrial clients, we provide:
For industrial roof waterproofing in Singapore, we have the equipment and team size to handle large projects efficiently without sacrificing quality.
For landed property roof waterproofing – terrace houses, semi-detached homes, bungalows, and car porches with metal roofing – we provide the same professional standard as our commercial work, sized and priced for residential projects.
Many homeowners in Singapore have corrugated metal car porches, rear extensions, or garden structures with metal roofing that leaks during heavy rain. We fix these properly, not with a temporary patch but with a full waterproofing treatment that lasts.
Honestly, the cost depends on your roof’s size, condition, and what it actually needs, but here’s a clear breakdown so you know what to expect.
The price depends on a few simple things.
| System | Approximate Cost Per m² |
| Acrylic/elastomeric roof coating | $8–$18 per m² |
| Liquid membrane system | $15–$28 per m² |
| Torch-on membrane for flat sections | $25–$45 per m² |
| Rust treatment and anti-corrosion primer | Additional $5–$10 per m² |
A typical residential metal roof or car porch costs $800–$3,000 total. A large industrial or commercial roof costs more. These are guide figures only – your actual roof waterproofing cost in Singapore depends on what we find during the inspection.
We give you a fixed written quote after the free inspection – no hidden fees, no surprises.
Every metal roof waterproofing job we complete comes with a written workmanship warranty. If the waterproofed area leaks again within the warranty period, we come back and fix it at no extra cost – in writing, not just a verbal promise.
We use only BCA-approved waterproofing systems with manufacturer product warranties. Our standard metal roof waterproofing warranty in Singapore coverage is 5 years on workmanship – confirmed in writing before we start.
At Allseal Waterproofing, our goal is to give our clients the best service possible. Here’s some feedback from our happy customers who trusted our experienced Waterproofing Specialist in Singapore team to solve their waterproofing problems effectively.
“I had a persistent water leak in my bathroom, and their team fixed it quickly and efficiently. They explained everything clearly and used high-quality materials. Now, my bathroom is completely dry, and I no longer worry about water damage. Highly recommend their service!”
kelvin
“I was impressed by how fast they responded to my request. The team arrived on time, found the source of the leak, and repaired it without any hassle. The pricing was fair, and they even gave me tips to prevent future leaks. Great service!”
Edmund
“They did an amazing job fixing the leak in my bathroom. The team was friendly, professional, and very knowledgeable. They took the time to ensure everything was properly sealed and tested. I will definitely call them again if I ever need plumbing repairs!”
Williams
A good acrylic or elastomeric coating lasts 8–12 years. A liquid membrane system lasts 10–15 years. How long it actually lasts depends on surface preparation quality and how well routine maintenance is carried out. We give you honest guidance on the expected lifespan for whatever system we recommend.
In most cases, yes, as long as the metal sheets are structurally sound. A full roof replacement costs significantly more than waterproofing. If the metal is badly rusted through or structurally compromised, we’ll tell you honestly. But for most roofs we see in Singapore, proper waterproofing extends the life by many years at a fraction of replacement cost.
Yes, in most cases. Seam sealing, fastener treatment, crack injection repair, and a new waterproofing coating will stop active leaks and prevent new ones without any roof replacement needed.
Yes, the seam profile is different, and the coating needs to follow the Klip-Lok profile correctly to avoid gaps at the seams. Our team has specific experience with Klip-Lok systems and understands exactly how to treat them properly.
We recommend a visual inspection every 2–3 years and a professional inspection every 5 years. Catching small issues early before they become active leaks is always cheaper than reactive repairs. We offer maintenance programs for commercial and industrial clients.
Yes, completely free, no obligation. We visit, assess the full roof condition, and give you an honest written recommendation. No pressure to proceed.
We offer same-day emergency response across Singapore for active commercial roof leaks. Call or WhatsApp us, and we’ll get a specialist to your property as fast as possible.
Don’t wait for the next rainy season to find out your roof has a problem.
Book your free metal roof inspection today.
BCA registered · BizSAFE certified · Written warranty · Transparent pricing.
Allseal Waterproofing PTE Ltd, your trusted partner for all waterproofing needs. Based in Singapore, we provide expert solutions for leaks and dampness. Contact us for unparalleled service.
