Roof Waterproofing in Malaysia for Flat and Concrete Roofs
Roof waterproofing in Malaysia costs about RM7 to RM9 per sq ft for a liquid or torch-on membrane system on flat concrete roofs, slabs and car porches, with a 10-year warranty. Our waterproofing specialist inspects for free, checks ponding and old membrane failure, and quotes on the spot. A typical porch takes one to two days.
Book a free inspection
Flat concrete roofs are everywhere in Malaysia: car porches on terrace houses, shophouse rooftops, extensions at the back kitchen and roof slabs on bungalows. They are also the roofs most likely to leak, because water sits on them after every storm instead of running off. Once the old coating cracks or the membrane laps open, water soaks into the slab and comes through as damp patches, peeling paint or drips at the edge of the ceiling.
Malaysia Roofing Specialist provides roof waterproofing across the Klang Valley, Johor, Penang, Perak, Kedah, Negeri Sembilan, Melaka and Kuantan. Our CIDB-registered installation partner prepares the surface properly and applies a full membrane system, not just a coat of paint. Book a free inspection to find out whether your roof needs a patch or a full re-membrane.
Signs your flat roof needs waterproofing
A concrete roof can look fine from the top while water is already moving through the slab. Look out for these signs, especially after a few heavy afternoon storms in a row.
- Water ponding for more than a day after rain
- Damp patches, efflorescence (white salt marks) or peeling paint on the ceiling below
- Cracks in the screed or old coating, or blisters and bubbles in an old membrane
- Gaps at the joint between the porch slab and the house wall
- Rust stains from exposed reinforcement bars, a sign water has been getting in for years
- Leaks around drains, aircond trunking or pipe penetrations through the slab
How we waterproof a concrete roof
Good waterproofing is mostly preparation. A new membrane laid over a wet, dusty or cracked surface will fail early, so our site team follows a fixed sequence.
- Inspect and test: check falls to the drain, ponding areas, cracks and the condition of any old coating
- Prepare: remove loose or failed material, clean the surface and let it dry
- Repair: fill cracks, correct low spots where practical, and treat corners and upstands
- Prime and apply the membrane, with extra reinforcement at drains, edges and penetrations
- Water test where possible, then hand over with photos and the 10-year warranty
Waterproofing options: liquid membrane, torch-on or coating
The right system depends on how the roof is used and how much movement and foot traffic it gets. Our technician will recommend one after seeing the roof.
- Liquid-applied membrane: seamless, good for complex shapes, upstands and roofs with many penetrations
- Torch-on bitumen membrane: thick, durable sheets heat-welded at the laps, ideal for larger flat roofs and car porches
- Ceramic or heat-reflective coating: reduces heat and protects the surface, but it is not a substitute for a membrane on a leaking slab
- Wall junctions and parapets: often combined with PU injection where cracks run into the wall
Roof waterproofing price in Malaysia (2026 indicative)
Membrane waterproofing is priced by area. A typical car porch of 200 to 300 sq ft falls in a modest range, while a shophouse roof is quoted after measurement. The exact price is confirmed after the free inspection, as preparation work, access, and the condition of the old layers vary from roof to roof.
Our process from inspection to warranty
- Send your address, a description and photos of the roof and ceiling through the booking form
- We confirm a free inspection slot with the nearest branch team, usually within 1 to 3 working days
- Our technician measures the area, tests for leaks and gives a quotation on the spot
- You confirm and pay a deposit; works are scheduled for a dry weather window
- Balance is paid on completion and the 10-year warranty is issued
When to waterproof, and how to keep it working
The best time to waterproof is before the leak spreads into the reinforcement. Once steel bars start rusting, the concrete spalls and repairs get much bigger. If you can, schedule works in a drier spell rather than mid-monsoon, as membranes need a dry surface to bond.
After waterproofing, keep drains and outlets clear of leaves, avoid drilling new holes through the slab without resealing, and have the roof checked if you add solar panels, water tanks or aircond units on top.
Indicative prices (2026)
| Job | Price range | Warranty |
|---|---|---|
| Liquid or torch-on membrane waterproofing (flat/concrete roof, slab, car porch) | RM7 – RM9 per sq ft | 10 years |
| Ceramic / heat-reflective roof coating | About RM6 per sq ft | 5 years |
| Minor roof leak repair (small area) | RM350 – RM1,800 | Up to 1 year workmanship |
| Roof inspection + on-the-spot quotation | FREE (remote areas RM150) | — |
Indicative ranges in Malaysia. The exact price is confirmed after the free inspection (roof design, pitch, access and damage).
What happens after you book
Tell us the problem
Send your address and a few photos. Tell us if it leaks only when it rains or also when it is dry.
Free inspection
A technician visits within 1–3 working days, water-tests and checks the roof, and shows you the cause.
Quotation on the spot
A clear written quotation. No obligation. Deposit only when you confirm.
Works + warranty
Our site team completes the job and you receive a written workmanship warranty.
Frequently asked questions
How much does roof waterproofing cost in Malaysia?
Liquid or torch-on membrane waterproofing for flat concrete roofs, slabs and car porches costs about RM7 to RM9 per sq ft in 2026, with a 10-year warranty. A 250 sq ft car porch, for example, would fall roughly between RM1,750 and RM2,250. The exact price is confirmed after the free inspection based on preparation, access and roof condition.
What is the best waterproofing for a flat roof in Malaysia?
For most flat concrete roofs in Malaysia, a properly installed membrane system works best, either torch-on bitumen sheets or a liquid-applied membrane. Torch-on suits larger open roofs and porches, while liquid membrane suits complex shapes and many penetrations. The choice depends on the roof, so our technician recommends one after inspection.
How long does roof waterproofing last?
A well-prepared membrane system on a Malaysian flat roof is backed by our 10-year warranty. How long it lasts in practice depends on preparation, drainage and how the roof is used. Blocked drains, ponding and new holes drilled through the membrane are the main things that shorten its life, so simple maintenance helps a lot.
Can waterproofing be done during the rainy season?
Membranes need a clean, dry surface to bond, so our site team schedules waterproofing in dry weather windows. During the monsoon months this may mean starting early in the morning or waiting a day or two after heavy rain. Inspection and quotation can still go ahead in any season.
Is roof paint the same as waterproofing?
No. Roof paint or ceramic coating protects the surface and reflects heat, but it is thin and cannot bridge cracks in a leaking slab for long. A waterproofing membrane is a thicker, continuous layer designed to keep water out. On a leaking flat roof, a membrane is the proper fix; coating is a good add-on for heat.
Can I waterproof my car porch roof myself?
Small DIY products can seal a hairline crack for a while, but most porch leaks come from failed joints at the house wall, poor falls or an aged membrane. Those need surface preparation and proper detailing at edges and drains. A professional membrane job also comes with a 10-year warranty, which DIY does not.
Who is responsible for waterproofing a condo roof?
Under the Strata Management Act 2013, the main roof of a condominium or apartment is usually common property, so the JMB or MC is responsible for waterproofing it. Areas within your own parcel, such as a private roof terrace or balcony, are typically the owner's responsibility. We can quote either the owner or the management body.
Do you need to hack the old waterproofing first?
Not always. If the old membrane or screed is still well bonded, it can sometimes be prepared and overlaid. Loose, blistered or badly cracked layers must be removed, because a new membrane is only as good as the surface beneath it. Our technician checks this during the free inspection and includes it in the quote.
Areas we cover
Klang Valley, Putrajaya, Negeri Sembilan & Melaka
Kuala Lumpur, Petaling Jaya, Shah Alam, Subang Jaya, Puchong, Cheras, Klang, Kajang, Seri Kembangan, Ampang, Kepong, Setia Alam, Cyberjaya, Putrajaya, Rawang, Bangi, Semenyih, Damansara, Bukit Jalil, Sungai Buloh, Seremban, Nilai, Melaka
Johor
Johor Bahru, Skudai, Kulai, Pasir Gudang, Iskandar Puteri, Batu Pahat, Muar, Kluang
Penang, Kedah, Perak & Kuantan
Penang, Bukit Mertajam, Butterworth, Bayan Lepas, Ipoh, Taiping, Alor Setar, Sungai Petani, Kulim, Kuantan
Roofing guides
- Cost guideWaterproofing Price per Square Foot Malaysia 2026Waterproofing price per sq ft in Malaysia 2026: RM7-RM9 for flat roofs and car porches, 10-year warranty.…
- Strata & ownershipCondo Roof Leak: Is the JMB or MC Responsible?Top-floor condo unit with a roof leak? General Strata Management Act 2013 principles on JMB/MC…
- All guides