Roof Waterproofing in Penang
Need roof waterproofing in Penang? Our site teams in Penang waterproof flat concrete roofs, car porches and shophouse rooftops with liquid or torch-on membrane systems, priced at about RM7 to RM9 per sq ft with a 10-year warranty. Book a free inspection and get a written quote on the spot, with no obligation to proceed.
Book a free inspection
Shophouse flat roofs and air well areas in George Town often need a full waterproofing system, planned around heritage guidelines.
Common roof problems in Penang
- Broken clay tiles and rotting timber rafters on heritage shophouses let water in.
- Salty sea air corrodes metal gutters, flashing and screws on coastal homes.
- Wind-driven rain on hillside homes enters under tiles and at ridges.
Neighbourhoods we serve in Penang
George Town, Pulau Tikus, Jelutong, Gelugor, Air Itam, Tanjung Tokong, Tanjung Bungah, Batu Ferringhi, Bukit Jambul, Balik Pulau
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
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 is flat roof waterproofing in Penang?
Membrane waterproofing in Penang is indicatively RM7 to RM9 per sq ft with a 10-year warranty. The exact price for your Penang property is confirmed after our free inspection, once we have measured the area and checked the surface.
Can you waterproof a shophouse roof in Penang?
Yes. Our site teams handle shophouse and commercial flat roofs in Penang. Larger roofs over 5,000 sq ft receive a formal quotation after a site survey.
How soon can you come to Penang for a waterproofing inspection?
Most Penang addresses get a free inspection slot within 1 to 3 working days. Book online any time and we will confirm the nearest team serving Penang.
Do you cover George Town, Tanjung Bungah and Air Itam?
Yes. Our north team covers Penang Island, including George Town, Pulau Tikus, Jelutong, Gelugor, Air Itam, Tanjung Tokong, Tanjung Bungah, Batu Ferringhi, Bukit Jambul and Balik Pulau. The roof inspection and on-the-spot quotation are free. Book online with your address and photos.
How fast can a roofer come to Penang?
Free inspections on Penang Island are usually arranged within 1–3 working days. During heavy storm periods, slots fill faster, so book early. For condos, check with your JMB or MC first, as roofs and common areas are usually their responsibility under the Strata Management Act 2013.
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.
Other roofing services in Penang
Nearby areas
Bukit Mertajam, Butterworth, Bayan Lepas, Ipoh, Taiping, Alor Setar