A roof that leaks every monsoon, a toilet that stains the ceiling below, a balcony that never dries. Rayson supplies liquid-applied membranes with published data and introduces authorised applicators in Johor, Kuala Lumpur and Penang who find the cause, quote the repair and install it.
Flat concrete roofs on terrace houses, shophouses and factories; tiled and pitched roofs; metal roofs with rusted laps.
The concealed membrane under the tiles, done once, properly, before the tiler arrives.
Surfaces that are rained on and walked or driven on, where a membrane must also be a wearing surface or sit under a screed.
| What you see | Likely cause | The repair |
|---|---|---|
| Stain under a toilet or bathroom, worse after showers | Failed waterproofing under the tiles above | Strip the wet-area floor above, WB20 membrane, flood test, retile |
| Stain under the roof slab, worse after rain | Aged or cracked roof membrane, ponding | Clean, repair cracks, prime, AC10 or RC40 membrane over the whole roof |
| Wet patch beside a parapet, outlet or pipe | Detail never sealed or has split | Reinforced detailing at the junction, then a field coat |
| Steady drip regardless of weather | Pipe or tank leak | Plumber first; waterproofing only if the slab was damaged |
| Damp wall, peeling paint, mould | Rain driven through render, or rising damp | External wall membrane (AC10), or a cement-based treatment with RW1 in the render |
The whole roof or room, the leak or stain up close, and the outlets, upstands or floor trap. Area in square feet and the type of building.
Which membrane, which primer, which details, in writing with the data sheets.
The authorised applicator for your area confirms the cause on site and quotes the repair per square foot. The quotation, invoice and workmanship warranty are the applicator’s.
Details first, field coat last, flood test or rain check before handover. Rayson warrants the membrane.
Rayson makes and specifies every membrane you see below. The independent, Rayson-authorised applicator finds the leak, quotes the repair, installs it and warrants the workmanship. Each job page shows how the work runs, what to send and what decides the price.
The membrane under the tiles, done once and flood-tested before the tiler starts.
Roofs, ceilings, walls and balconies · Rayson membranes
Flat concrete, tiled and metal roofs: the cause found first, then a membrane over the whole roof.
Flat roofs that pond or are walked on: SealForce RC40 polyurea.
Quoted after inspectionRead the stain first: toilet above, roof, pipe or wall each need a different repair.
Under a roof: a roof membrane instead. A steady drip in any weather: a plumber first.
Quoted after inspectionDamp, peeling, mouldy walls: rain through the render, rising damp or a leak next door.
Water from a wet area behind the wall: that room is re-waterproofed instead.
Quoted after inspectionSurfaces that are rained on and walked on, with a room underneath that must stay dry.
Under new tiles: SealForce WB20 beneath a protected screed.
Quoted after inspectionLarge flat and metal roofs in Johor’s industrial parks, coated without stopping production.
Metal and free-draining roofs: SealForce AC10, over an anti-corrosion primer on metal or AP05 on concrete.
Quoted after inspectionNot sure where the water comes in? Send three photos: the stain, the area above it and the whole room or roof.
Send the leak All jobs in Johor ↗Look at where the stain is and when it grows. Under a toilet or bathroom, and worse after someone showers: the wet-area waterproofing above has failed, and the fix is on that floor. Under the roof slab, worse after rain: it is the roof membrane, a cracked parapet or a blocked outlet. A pipe leak drips steadily whatever the weather. The applicator confirms on site before anything is opened up.
Per square foot, after inspection. A roof coated with an acrylic membrane on a sound, clean substrate is the lowest cost per square foot; a polyurea membrane on an exposed flat roof costs more and lasts longer; re-waterproofing a toilet means removing and relaying the tiles, so the tiling is most of the bill. Rayson publishes no price list; the authorised applicator for your area quotes the job.
A pitched or tiled roof that drains freely, or a roof with many penetrations: SealForce AC10 acrylic, cold-applied from the pail over SealForce AP05 primer. An exposed flat concrete roof that holds water after rain, or a roof you walk on: SealForce RC40 polyurea, UV-stable and walkable. Both are liquid-applied, so there are no seams to fail.
The old finish comes off down to a sound screed, the floor-to-wall junction and the floor trap are detailed, SealForce WB20 goes on in two coats and turns up the walls, and the floor is flood-tested for 24 hours before the tiler starts. SealForce RW1 in the screed, the render and the tile adhesive makes the cement layers themselves water-resistant.
An independent applicator in Johor, Kuala Lumpur or Penang, introduced by Rayson, quotes, installs, invoices and warrants the workmanship. Rayson supplies the membrane and warrants the material. Material warranty terms are stated per product on request.
No. Flake epoxy is a floor finish. Some installers in Malaysia sell it as toilet waterproofing, but an epoxy coat over tiles does nothing for the screed underneath, which is where the water goes. Waterproofing is the membrane under the tiles, flood-tested before tiling.
Both. Terrace and semi-detached houses with flat concrete roofs, car porches and balconies are typical jobs in Johor, Kuala Lumpur and Penang; so are shophouse roofs, factory roofs and the podium decks of condominiums.
Tell us what the surface is, where it is and what it has to withstand. Rayson replies with a system recommendation; for installation, the applicator for your area in Johor, Kuala Lumpur or Penang is introduced to quote the job.
Malaysia launch: 1 March 2027. Enquiries are welcome now; supply, site assessment and installation timing are confirmed for each project.