Tired of patching the same roof leak every monsoon season? Ace Plumber Johor Bahru applies professional-grade waterproofing membranes and coatings to flat roofs, concrete slabs, and terraces across Johor Bahru — sealing your roof for years, not months.
From aging flat roofs to balcony slabs — these are the waterproofing challenges we solve across JB properties.
Water pools on flat concrete roofs after rain and slowly seeps through hairline cracks. We apply elastomeric membrane coatings that bridge cracks and repel standing water.
Previous waterproofing coating has peeled, cracked, or bubbled, leaving the concrete exposed again. We strip the failed layer, prep the surface, and apply a new system.
Water seeping through balcony tiles into the room below. We apply waterproof membrane under tile level or coat exposed surfaces to create an impermeable barrier.
Structural movement causes cracks in roof slabs that widen over time. We fill cracks with flexible sealant and apply membrane coating that stretches with movement.
Water penetrates through the joint between the roof slab and parapet wall. We seal the junction with reinforced membrane tape and waterproof coating for a watertight bond.
Screws and overlap joints on metal deck roofs corrode and leak. We seal joints with polyurethane sealant and apply waterproof coating over the entire surface for complete protection.
Professional application, lasting results. No shortcuts.
Describe your roof leak or send photos. We'll assess the situation and arrange a site visit to inspect the roof surface.
Our team inspects the roof, measures the area, and recommends the right waterproofing system. You get a firm quote before we begin.
We prep the surface, apply the membrane or coating in proper layers, and let it cure. You get a warranty-backed waterproof roof.
Many waterproofing jobs fail within a year because the surface wasn't properly cleaned, the wrong product was used, or corners were cut on application layers. We follow manufacturer specifications precisely — proper surface prep, correct primer, full-thickness coating, and adequate curing time — because that's what makes waterproofing last 5-10 years instead of 5 months.
We offer torch-on membrane, liquid applied membrane, polyurethane coating, and cementitious waterproofing. We recommend the right system based on your roof type, budget, and expected lifespan.
We pressure-wash the surface, repair all cracks and defects, apply primer, and let it dry before coating. This prep work is what separates a 5-year waterproofing job from one that fails in 6 months.
Every waterproofing job comes with a workmanship warranty. If the coating fails or a leak returns in the warranted area within the coverage period, we return and fix it at no cost.
We use proven waterproofing products from reputable manufacturers trusted in Malaysian construction.
We recommend the right product for your situation. All products come with manufacturer warranty.
Hear from customers who have used our plumbing services in JB.
"Our flat roof terrace was leaking into the bedroom below. They applied a torch-on membrane with proper overlaps and drainage. Two monsoon seasons later — completely dry."
"The previous waterproofing on our concrete slab roof had failed after just three years. This team stripped it, fixed the cracks, and applied a new Sika system. They offered a 5-year warranty too."
"We had the entire rooftop of our shophouse waterproofed. The coating was applied evenly and they paid attention to all the parapet wall joints. No more dampness on the walls downstairs."
Real jobs completed by our plumbing team across Johor Bahru.
JB receives over 2,000mm of rainfall annually. Without proper waterproofing, your roof concrete absorbs water like a sponge. These signs mean it's time to act.
Report Your IssueYou've patched the ceiling multiple times but brown stains reappear after every heavy rain. The roof surface itself needs waterproofing, not just the ceiling.
Fix urgently — recurring damageHairline or wider cracks across your flat roof or terrace slab. Every crack is a channel for rainwater to enter the concrete and reach your ceiling below.
Fix soon — water enteringThe old coating is flaking, bubbling, or lifting at the edges. Once the membrane loses adhesion, it no longer protects the concrete underneath.
Fix soon — protection goneWalls near the roofline showing damp patches or black mould. This usually means water is migrating through the roof-wall junction and needs membrane sealing.
Fix soon — health riskWater not draining away within a reasonable time means poor slope or blocked drainage. Ponding water accelerates concrete deterioration and increases leak risk.
Monitor — getting worseWe believe in honest pricing. Here's how it works.
Waterproofing costs depend on the roof area, surface condition, and the system used. The price we quote is the price you pay — we don't add charges after the job. We'll measure the area, assess the condition, and explain which waterproofing system suits your situation and budget before any work begins.
Ask for a QuoteWe cover all major areas in JB. Wherever you are, our team can reach you.
Common questions we get from customers in Johor Bahru about roof waterproofing.
Ask Us DirectlyWhatsApp us photos of your roof or describe the leak. We'll arrange a site inspection and recommend the right waterproofing solution — no obligation, no hidden fees.