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Waterproofing · Kuala Lumpur and Selangor · Rayson-authorised applicator

Toilet and bathroom waterproofing in KL and Selangor

Toilet and bathroom waterproofing in KL and Selangor condos and homes: SealForce WB20 under new tiles, ponding-tested, by an authorised applicator.

WhatsApp three photosHow the job runs

We reply within one working day, Monday to Friday.

A Rayson-authorised applicator in Kuala Lumpur and the Klang Valley. In Johor: Toilet and bathroom waterproofing in Johor. Also in Penang.

Who pays when a bathroom leaks into the unit below?

Under the Strata Management Act 2013, a leak between units is presumed to come from the unit above unless shown otherwise. The management body inspects within seven days of written notice and issues a certificate naming the cause and who must repair it; disputes go to the Commissioner of Buildings.

Before you choose

What does the strata law say about leaks between units?

Section 142 of the Strata Management Act 2013 presumes that a leak between floors comes from the unit above, unless its owner shows otherwise. Under the 2015 Regulations, the affected owner gives written notice to the developer, the JMB or the MC (regulation 56); it inspects within seven days (regulation 57) and certifies the cause and who must repair it (regulation 59).

Pipes that serve more than one unit are common property; a pipe that serves one unit is that unit’s. If either owner disputes the finding, the matter can go to the Commissioner of Buildings, and a leak in a new building may still be the developer’s under the defect liability period. This is a summary, not legal advice.

What does the management office need before the work starts?

Most condos ask for a renovation application, a deposit, set working hours and debris taken out through a set route. The owner applies; the applicator works to the building’s rules, protects the lift and the corridor, and keeps the noisy hacking to the permitted hours.

Ask the office for its renovation rules before booking the job, because hacking hours, deposits and lift bookings differ from building to building, and the programme is planned around them.

Can the bathroom be finished in microcement or flake instead of tiles?

Yes. The waterproofing goes on first either way: SealForce WB20 on the screed, ponding-tested, then IFS MicroCrete® microcement for a seamless mineral look, or IFS Epoxy Flake Lining for a speckled one, laid over the Rayson layers.

Both are IFS finishes under IFS’s own terms, chosen on a sample board, and each combined build-up is confirmed on a sample first. Neither is a membrane on its own: a finish over a leaking floor still leaks.

How do I know the new membrane works before the tiles go back?

By the ponding test: 24 hours after the final coat of SealForce WB20, the floor is flooded and left, and the ceiling of the unit below is checked. Tiles or a finish go on only once it holds.

The neighbour below is asked for access to look at the ceiling during the test, and the applicator photographs the membrane and the test for your records and the management office.

Bathroom finishes over a Rayson membrane

New tiles over SealForce WB20IFS MicroCrete® over SealForce WB20IFS Epoxy Flake Lining over the waterproofing
The membrane underneathSealForce WB20, ponding-testedSealForce WB20, ponding-testedChecked first; flake is not a membrane
Grout linesA line at every tileNone: one seamless surfaceNone: one seamless surface
The lookThe tile you chooseSoft, mineral, hand-trowelledSpeckled flakes in chosen colours
Who makes the finishYour tile supplierIFS, under IFS’s own termsIFS, under IFS’s own terms

A first guide. The applicator confirms the build-up at the site visit, and IFS finishes on a sample board.

What you see

The signs

  • A stain or drip on the ceiling of the unit below the bathroom
  • Grout that stays dark, or tiles that sound hollow
  • Water at the door threshold or behind the vanity
  • A complaint from the unit below, passed on by the management office
Why it happens

The usual causes

  • No membrane, or one broken when the floor trap or pipes were changed
  • A membrane that was never turned up the walls or sealed around the floor trap
  • Cracked screed and open grout that let water through
  • A leaking pipe in the slab or the wall, which needs a plumber first
How the job runs

From three photos to a finished job

  1. Find the source

    A water test, and in a condo the management body’s inspection and certificate.

  2. Take up and prepare

    Tiles out, screed repaired and laid to fall to the trap, pipes and the floor trap detailed.

  3. SealForce WB20 and the ponding test

    Two coats turned up the walls, around the trap and every pipe, then a 24-hour ponding test.

  4. Finish and hand over

    New tiles bedded with SealForce RW1 in the adhesive and grout, or an IFS seamless finish, and two warranties in writing.

What to send

Three photos are enough for a first quotation

  1. The ceiling stain in the unit below
  2. The bathroom floor and the floor trap, close
  3. The condo name and town, and whether the management office has inspected

Send them on WhatsApp

What it costs

What does toilet waterproofing cost in KL and Selangor?

Per square foot, quoted after inspection. Five things decide it: the bathroom size, hacking out and removing the old tiles, screed repairs and falls, the new finish (tiles, microcement or flake), and the building’s renovation rules: working hours, deposit and debris removal. Rayson publishes no price list.

Who stands behind the job

  • Rayson makes the materials, writes the specification and warrants the material.
  • The Rayson-authorised applicator for your area an independent company authorised by Rayson, contracts with you, inspects, quotes, installs and warrants the workmanship.
  • Rayson is not the installer and is not a party to the installation contract. Two warranties, two companies.
Where we work

Toilet and bathroom waterproofing in KL and Selangor: where the applicator works

  • Kuala Lumpur
  • Petaling Jaya
  • Shah Alam
  • Subang Jaya
  • Klang
  • Puchong

An independent, Rayson-authorised applicator in Kuala Lumpur and the Klang Valley; sites further out in Selangor are confirmed per enquiry. In Johor: Toilet and bathroom waterproofing in Johor. Also in Penang.

Rayson materials on this job

Every layer has a published data sheet

Layers, top to bottom: New tiles, once the 24-hour ponding test holds; Tile adhesive and grout with SealForce RW1; SealForce WB20, two coats, up the walls and round the trap; Screed repaired and laid to fall to the trap; Floor slab over the unit below

The build-up, top to bottom · diagram, not to scale

  1. New tiles, once the 24-hour ponding test holds
  2. Tile adhesive and grout with SealForce RW1
  3. SealForce WB20, two coats, up the walls and round the trap
  4. Screed repaired and laid to fall to the trap
  5. Floor slab over the unit below

Seamless instead of tiles: IFS MicroCrete® over the same ponding-tested WB20, confirmed on a sample first.

Rayson SealForce WB20 pail

Rayson SealForce WB20

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 RW1 pail

Rayson SealForce RW1

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 Rayson difference

An installer buys whatever is on the shelf. A Rayson-authorised applicator installs what Rayson makes.

01

The maker writes the specification

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.

02

A data sheet for every layer

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.

03

Two warranties, two companies

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.

04

Same materials on both sides of the Causeway

The products, data sheets and application methods are the ones Rayson publishes in Singapore. Nothing is rebadged for Malaysia.

05

Materials direct, for your own crew

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.

Related jobs

Jobs that often come with this one

Each with the Rayson layers it uses

All jobs in KL and Selangor ↗
01 Rayson system Layers: SealForce RC40 polyurea, details first, then the whole roof; Primer to the data sheet, fleece at moving cracks; Flat or porch-roof slab, cracks and falls repaired

Roof and ceiling leak repair in KL and Selangor

Flat roofs, porch roofs, tiled roofs and factory metal roofs in the Klang Valley: the leak traced, then the Rayson membrane that suits the roof.

  1. SealForce RC40 polyurea, details first, then the whole roof
  2. Primer to the data sheet, fleece at moving cracks
  3. Flat or porch-roof slab, cracks and falls repaired

Roofs that drain freely and old roof tiles: SealForce AC10 over AP05 primer. Metal roofs: AC10 over an anti-corrosion primer, with fleece at the laps.

Quoted after inspection
02 IFS finish · Rayson base Layers: MicroCrete® microcement, trowelled and sealed · IFS partner range; SealForce WB20 membrane in bathrooms and showers; Screed or render, laid to falls

Microcement in KL, Selangor and Penang

Seamless IFS MicroCrete® for condo bathrooms, floors and walls, with Rayson waterproofing under every wet area.

  1. MicroCrete® microcement, trowelled and sealed · IFS partner range
  2. SealForce WB20 membrane in bathrooms and showers
  3. Screed or render, laid to falls

Dry rooms: PrimeBond E20 on concrete or screed, or a bonding primer over firmly bonded tiles, in place of the membrane.

Quoted after inspection
03 IFS finish · Rayson base Layers: Epoxy Flake Lining or Metallic Epoxy · IFS partner range; PrimeBond E20 epoxy primer; Concrete floor, ground and repaired

Epoxy flake and metallic epoxy in KL, Selangor and Penang

Speckled epoxy flake and seamless metallic epoxy floors from the IFS range, for homes, garages and showrooms, over Rayson primer.

  1. Epoxy Flake Lining or Metallic Epoxy · IFS partner range
  2. PrimeBond E20 epoxy primer
  3. Concrete floor, ground and repaired

Firmly bonded tiles: grout lines filled and a bonding primer first.

Quoted after inspection
The practical details

Questions people ask

Who does the job in KL and Selangor?

An independent, Rayson-authorised applicator in Kuala Lumpur and the Klang Valley, including Petaling Jaya, Shah Alam, Subang Jaya and Klang. It inspects, quotes, contracts with you and warrants the workmanship; Rayson makes the materials and is not the installer. Sites further out in Selangor are confirmed per enquiry.

How long is the bathroom out of use?

Several working days: the tiles come out, the screed is repaired, the two coats of WB20 dry, the ponding test runs for 24 hours, then the tiling or finish and its cure. The applicator sets out the programme in the quotation, around the building’s working hours.

Does the unit below have to let anyone in?

Usually, once or twice: for the management body’s inspection of the ceiling, and to check it during the ponding test. The ceiling is made good once the bathroom above is proven dry.

Who gives the warranty?

Rayson warrants the materials as their maker; the Rayson-authorised applicator warrants the workmanship. Both are written into the quotation.

Start a conversation / ↗

Send the job, or ask for materials

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.

Thank you. Your enquiry has been received and we reply within one working day, Monday to Friday.

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