Ponding test, dye, meter, moisture meter: four checks, one at a time

Last updated 31 October 2026. Prices below are bands already printed on HomeySG. This page is not legal advice.

Most wet ceilings in Singapore are argued from memory. Someone showered, or it rained, or the aircon was on, and the stories arrive together. The cure is a boring order. First write what already happened. Then test supply, because a pressurised leak does not wait. Then test waste. Then pond the floor for the membrane. Then, and only then, talk about a coating, a regrout or a hack. The order is the whole method. Skipping to the hack is how a loose trap nut becomes a S$4,000 bathroom.

The history is a week, not a vibe. Make four marks: heavy rain with the bathroom unused, showers, flushes, and the aircon or the heater. A stain that appears only in the first row is a window, an external wall or a roof. Those have their own pages, and a window weep must stay open. A stain that appears in the second row is this article. A stain that appears only in the fourth row is the heater and aircon guide. If you cannot remember, start the week now and stop guessing. A photo of the stain this morning, and the same frame tonight, is the baseline. Paint over it and you have deleted the baseline.

Supply water is the meter. Shut taps, the washing machine and the heater inlet. PUB’s leaflet tells you to turn fittings and pumps off and to treat a dial that keeps running as a possible leak. It does not specify 15 minutes. The leak guide on HomeySG does, and prices that photo pair and the isolation at S$140 to S$220. Take the photos anyway. Look at the small rotor if your meter has one, not only the cubic-metre digits, which may be too coarse for a seep. If the register moved, stop. You do not have a membrane problem until a plumber has found the pipe. Waste water never passes this meter. A still meter is not a clean bill of health.

Dye belongs in the pan and the floor trap, never in the incoming water. A few drops, a flush or a jug, and someone downstairs looking for colour. Colour means the waste path: a pan collar, a trap, a cracked fitting. The exposed repair, reseated, is S$140 to S$380 on the leak guide. No colour, and a stain that still grows when the shower runs, pushes you toward the floor build-up or a pipe that is not the waste you dyed. Run the shower alone for a short, timed spell with the trap open, then again with other outlets off. Write the times. A shower that wets the bedroom wall beside it, rather than the ceiling below, is the wall upturn or a pipe in that wall. The seepage page covers the pattern. It is still not rising damp on the twelfth storey.

The pond is the membrane test. Plug the floor trap with a bung you can remove, not with a rag you will lose. Protect the doorway. Put water in the wet area only, shallow enough that it cannot cross into the dry room or the corridor. Mark the level on the tile with tape, not with a permanent pen you will regret. Wait. How long is the question everyone wants a number for. HDB says you and your contractor must water-test a bathroom after the floor finishes are replaced. The guideline page does not print a depth and does not print a duration. A homeowner method discussed on forums, a shallow flood for several hours, is a method, not a statutory pass mark. Use it as a careful test, not as HDB’s specification. Read two things at the end: the mark, and the ceiling below. The mark can fall because new screed or old grout drank some water. That is absorption. The ceiling is the leak. If the ceiling is unchanged and the level fell a little, do not declare a failed membrane. If the ceiling darkened, the water crossed the slab, and a coating on the glaze will not fetch it back.

Do not pond a room where the ceiling below is already dripping onto a light. Isolate that circuit first. Do not pond a flat where you cannot speak to the people downstairs. Surprising them with a test is how you become the dispute. Do not leave a plug in overnight if you are not sure the bung will hold or if a child will use the room. A test you cannot supervise is a flood of the corridor, which is a different invoice. Condos should tell the neighbour and, if the by-laws are jumpy about water, the manager. You are running a test, not starting a renovation.

Moisture meters are for comparison. A pin meter and a pinless meter both lie in predictable ways. Metal bead, foil-backed board, salts and a wall you painted yesterday read “wet”. A cold wall behind a wardrobe reads wet because it is cold and because condensation is real water. Take a reading on the stain and a reading on a boring internal wall in the same room. The difference is the clue. The absolute number is not a certificate, and we will not publish one. Infrared photos have the same limit. They are a map of temperature. Use them after the meter, the dye and the pond, not instead of them.

Homey Furnishing Pte. Ltd. (ACRA UEN 202018148K), 27 Mandai Estate, #06-10 Innovation Place, Singapore 729931, invoices permit-exempt leak checks, regrouting, silicone, and making-good after the water has stopped. V On Construction Pte. Ltd. (ACRA UEN 201611708H), on the HDB Directory of Renovation Contractors, invoices an HDB renovation permit when bathroom finishes are hacked or a new membrane is laid under new tiles. A concealed or new water-supply pipe is a PUB licensed plumber. Homey Furnishing is not that plumber and does not publish a waterproofing warranty term.

Curtains, blinds and roller shades are not part of this booking. Fabric window treatments are a different product, and these pages do not quote them.

If you do nothing else, do not stack the tests. Each one deletes a cause or confirms it.

1. Photograph the stain. Start a four-column note: rain, shower, flush, aircon or heater.
2. Meter photos, 15 minutes, everything off. If it moved, call a plumber path and stop.
3. If it stayed still, dye the pan and the trap on separate tries.
4. If there is still no colour, pond the wet floor, mark the level, and have the lower ceiling watched.
5. Only a dry lower ceiling with tired joints goes to regrout. A wet lower ceiling goes to the membrane page, after you check the 3-year rule.

The four tests do not change in a condo or a landed house. Who you must warn does.

08:00, photograph the ceiling, which is dry. 08:05, meter photos, nobody showers. 08:20, second photo, meter still. 08:30, dye in the pan, one flush, neighbour sees no colour. 09:00, dye in the floor trap, a jug of water, still no colour. 09:30, bung in, shallow water, tape mark, bathroom door shut. 12:30, mark almost unchanged, neighbour’s ceiling now has a dark patch that was not there at 08:00. You stop. You do not add more water. You do not regrout. You photograph both ceilings and you read the 3-year date before anyone lifts a tile. That is a membrane conversation.

Change one fact and the morning ends differently. If the 08:20 meter photo shows movement, you never reach the bung. If the neighbour sees dye after the flush, you are looking at a collar, S$260 to S$480 on the pan-collar band or S$140 to S$380 on the leak-guide collar sentence, and you are not buying epoxy grout. If the ceiling stays dry and the joints are missing, the regrout at S$400 to S$900 is the spend, for a typical HDB bathroom. The morning is what stops those three invoices being the same invoice.

A hose on the wall for a minute. A steam mop. A moisture meter announced as 30 percent with no second reading. Silicone tooled over the trap “to see if it helps”, which hides the dye path. A hack started because the contractor’s afternoon was free. Paint on the lower ceiling the same day, so nobody can see whether the test worked. Each of those has been sold as thorough. None of them is the order above.

A careful diagnosis leaves the bung out, the electrics dry, the neighbour spoken to, and a page of times. It ends on one page of this site, not on all of them. If it cannot end, the honest line is quote on inspection and another visit, not a larger hole.

Follow the first positive test. Do not collect them.

A contractor who will not follow this order should not be the one who hacks.

1. Will you look at the meter photos before you price a membrane?
2. Will you dye the waste, or are you skipping to the floor?
3. How will you pond, and who is downstairs?
4. What will you do if the water level falls and the ceiling stays dry?
5. Are we inside the 3-year finish ban?
6. Which single HomeySG band are you quoting, or is it quote on inspection?

If the lower ceiling is an HDB neighbour and the pond says the slab is passing water, move to the inspection guide before a private hack. If it is a condo, write to the MCST with the same photos. Do not announce a legal result. The letters and section 101(8) are linked from those pages.

Stop the test if water reaches electrics, if you lose control of the bung, or if the only way to “see the pipe” is to hack a household shelter. SCDF forbids that. Call 995 if you cannot make a wet, live room safe. A window that drips in rain without a pond is not a reason to flood the bathroom.

How you're charged

A leak or waterproofing job that already has a sentence on HomeySG uses that sentence. Nothing in this table is a fuel surcharge, and the handyman hour is not added on top of a band unless the written scope says so. A membrane, a balcony, a planter, a roof, an epoxy-grout system, or a listening survey with no matching row is quote on inspection.

Who is allowed to do the work

HDB’s renovation pages split a coat of silicone from a hacked bathroom. Replacing toilet wall and floor finishes is not allowed for 3 years from the completion date of the block, because a membrane sits on the screed. After that, a replacement uses pre-packed waterproofing screed, a membrane upturned at least 150mm at walls, kerbs and pipes, a UPVC floor-trap grating with a long collar, and a water test. Fines for unauthorised work are already written on the permit guide as up to S$5,000. Homey Furnishing does not sign the permit invoice.

• Regrout, a silicone zone, hollow-tile injection and a stain repaint after the water has stopped stay on the published rows. They do not replace a membrane.
• Opening the bathroom floor or wall finishes is V On Construction when the flat is HDB and the work needs a permit.
• PUB’s leak leaflet says it is an offence under the Public Utilities Act to engage an unlicensed worker for plumbing work. A concealed or new supply pipe is a licensed plumber. An exposed trap is a different visit.
• External walls of an HDB block are common property. The town council on the S&CC bill is the first report, not a private injector.
• SCDF does not allow hacking of household-shelter walls, floor slabs or ceiling slabs to chase a pipe. The leak is found another way.
• A window-frame leak is the window sealant page. Exterior rivets and stays stay with a BCA approved window contractor.
• Curtains, blinds and roller shades are not quoted here.

Ways to keep the bill smaller

• Photograph the stain, the wet room, and the water meter before anyone hacks. A hack that destroys the evidence is a second problem.
• Run one test at a time. Shower, flush, aircon and rain on the same afternoon make a useless log.
• If the joint is only mouldy silicone, the published zone is S$80 to S$150. That is not a membrane.
• If the ceiling is already dry and the source is fixed, the hairline repaint is S$150 to S$400. Paint on a live leak is how the stain returns.
• The meter photos are free if you take them yourself. Do that before you pay S$140 for someone else to hold the phone.

WhatsApp the photos to +65 8561 0630.

Diagnosis has one published test band. The other numbers are the repairs you might reach, printed so they stay distinct.

Anything not in that table is quote on inspection.

WhatsApp the photos to +65 8561 0630. The reply uses a band already printed on HomeySG, or it says quote on inspection.

Official pages, not a legal opinion

HDB requires a water test and does not, on the page we read on 31 October 2026, specify depth or duration. PUB’s leaflet is the meter check. We added no pass mark of our own.

• HDB renovation information. Water test after bathroom floor finishes are replaced. No depth or hours printed there.
• PUB, find and fix leaks. Dial still running with fittings off may be a leak.
• HDB ceiling leaks. Once the pond implicates the slab, the neighbour process starts.
• BMSMA section 101. Condo presumption, after you have evidence, not instead of the test.
• SCDF shelter. The test does not include opening a shelter.

• Book the meter test
• If the pond fails
• If the ceiling stays dry
• Rule the appliances out
• If it only rains at the frame
• Who pays