Ceiling leak repair in Johor Bahru: the stain traced to the toilet, roof, pipe or wall above, then the source fixed by a Rayson-authorised applicator.
We reply within one working day, Monday to Friday.
Also in Kuala Lumpur and the Klang Valley, and Penang, through authorised applicators there.
Ceiling leak repair means fixing the source above, not the ceiling. The water comes from the toilet or balcony above, the roof, a leaking pipe or an outside wall. The Rayson-authorised applicator confirms which, repairs and tests it, and makes good the ceiling only once it has stayed dry.
Where the stain is and when it grows narrow it down; a moisture reading and a look at the floor, roof or wall above confirm it. Nothing is opened until the cause is clear.
For a toilet above, a controlled water test on its floor shows whether the ceiling darkens. For a roof, the outlets, parapets and membrane are checked after rain.
The waterproofing has to be redone in the toilet above, so the owner of that unit arranges and pays for the repair in most cases. The applicator can inspect both units and put the cause in writing for the two owners or the management.
In a strata building the management office can help arrange access, and the applicator’s written finding helps the owners agree on the repair.
Paint hides it until the next rain or shower. Repair the source first; the applicator repaints the ceiling once it has stayed dry.
Stain-blocking paint is the last step, once the source is fixed and the ceiling has stayed dry through a few rains or showers.
Send the three photos on WhatsApp first; the applicator books an inspection in Johor Bahru and the surrounding towns within days, sooner for an active drip.
For an active drip, put a container under it and switch off any light fitting near the wet patch until the inspection.
| Compared on | A toilet or bathroom above | The roof | A pipe | An outside wall |
|---|---|---|---|---|
| When it shows | Worse after showers | Worse after rain | Any weather, steady | After wind-driven rain |
| Where it shows | Under the wet area | Under the roof slab | Along the pipe run | Near the outside wall |
| How it is confirmed | A water test on the floor above | A check after rain | Moisture readings along the pipe | Moisture readings inside and out |
| The repair | WB20 under new tiles, flood-tested | A membrane over the roof | A plumber first | A membrane on the outside face |
| Rayson materials | SealForce WB20 and RW1 | SealForce AC10 or RC40 | None | SealForce AC10 over AP05, RW1 in the render |
A first guide. The applicator confirms the cause on site before anything is opened.
Where it is and when it grows narrows the cause; a moisture reading and a look above confirm it.
Toilet: strip and re-waterproof the floor above with WB20. Roof: membrane over the roof. Pipe: plumber first. Wall: external membrane or render treatment.
Flood test or rain check, then the ceiling is made good only once it has stayed dry.
Quoted after the cause is confirmed, because the repair is a different job each time. Five things decide it: the source (toilet, roof, pipe or wall), the area to waterproof, the tiles or roof finishes to lift and replace, access, and making good the ceiling. Making good the ceiling itself is a small part; the waterproofing above or the roof is the real work. Rayson publishes no price list.
Also in Kuala Lumpur and the Klang Valley, and Penang, through Rayson-authorised applicators there; availability confirmed per enquiry.
The build-up, top to bottom · diagram, not to scale
Under a roof: a roof membrane instead. A steady drip in any weather: a plumber first.
Rayson SealForce WB20 is a one-part, water-based, polyurethane-modified waterproofing membrane for toilets, showers, bathrooms, balconies and other interior wet areas — rolled or brushed on in two coats and concealed beneath the tiles, screed or render.
Specifications →
Rayson SealForce AC10 is a one-part, water-based acrylic waterproofing membrane for exposed roofs, old roof tiles and external walls — applied cold, straight from the pail, by brush, roller or airless spray, and drying to a seamless, elastic, UV-resistant film.
Specifications →
Rayson SealForce RC40 is a two-component, cold-applied aliphatic polyurea waterproofing membrane for exposed roofs — roller-, brush- or spray-applied, UV-stable and walkable, with certified cool-roof reflectance.
Specifications →
Rayson SealForce RW1 is a one-part latex waterproofing and bonding additive for cement-based work — mixed into renders, screeds, slurry coats, tile adhesives and grout to cut water penetration, strengthen the mortar and improve its bond and flexibility.
Specifications →The system is specified by the company that makes the material, and installed by an independent applicator Rayson has authorised, not chosen from whatever a supplier had on the shelf that week.
Every Rayson material on your floor or roof has a published technical data sheet. You can read what went in, and so can your consultant.
Rayson warrants the material as its maker. The authorised applicator, an independent company that contracts with you, warrants the workmanship. Each warranty is issued by the company responsible for it.
The products, data sheets and application methods are the ones Rayson publishes in Singapore. Nothing is rebadged for Malaysia.
Contractors and facility teams buy the same materials direct from the maker, with application guidance. The applicator is there when you want the job done for you.
Each with the Rayson layers it uses
All jobs in Johor ↗The membrane under the tiles, done once and flood-tested before the tiler starts.
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 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 inspectionIt can be: a plasterboard or gypsum ceiling that bulges with water can give way. Keep people and furniture clear, switch off the lights in that room and send a photo straight away.
Rarely. A toilet repair takes that toilet out of use for about a week; a roof repair is done from outside. The applicator explains the disruption at the inspection.
Rayson warrants the membrane or additive used as its maker; the Rayson-authorised applicator warrants the workmanship. Both are written into the quotation.
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.