Check when the water drips first - it points to one of 4 likely causes. Dripping after rain usually points to the roof; after someone showers or uses water upstairs, to worn waterproofing; only while the AC is running, to the AC drain pipe; and continuous dripping unrelated to rain or water use, to a leaking supply pipe.
Once you've spotted the timing, check other signs to confirm the cause before calling a technician.
4 Causes, Sorted by Drip Timing
| What you observe | Likely cause | Who to call |
|---|---|---|
| Water seeps after heavy rain, especially near the roofline or wall joints | Roof leak — cracked tiles, worn joints, or a clogged gutter | Roof repair technician |
| Stains or drips appear after showering or using water upstairs, right below the upstairs bathroom | Worn waterproofing on the upstairs bathroom floor | Waterproofing technician |
| Drips only while the AC runs, stopping once it's off | Clogged or disconnected AC drain pipe | AC repair technician |
| Continuous dripping, unrelated to rain or water use | Leaking supply pipe inside a wall or above the ceiling | Plumber |
If the ceiling panel is swollen, stained, or sagging from built-up moisture, it usually needs replacing on top of fixing the root cause. See pricing at ceiling work.
What to Do Before the Technician Arrives
While waiting for the technician, do a few things right away to limit damage and the risk of a short circuit.
- Cut power to the circuit near the leak, especially if there's a recessed ceiling light nearby, to prevent a short circuit.
- Place a container under the drip and empty it regularly so it doesn't overflow onto the floor.
- Photograph the affected area, including the drip point and the extent of the staining, to help the technician assess the cause.
- Don't pry open or cut into the ceiling yourself — you could hit wiring or damage the ceiling frame further. Leave it to a technician with the right tools to inspect.
What to Send on LINE
Your first LINE message should include the following so the team can review it quickly:
- Photos of the leak/stain, with a wide shot showing its position on the ceiling
- When you notice it — e.g. after rain, after a shower, or after running the AC
- Your home/area location and province
The team reviews your information before matching you with a technician suited to the issue. You approve the technician's details and price before work starts, with a link to track the job status. The actual cost depends on the cause and materials needed. Some cases involve a 500 ฿ in-province site-visit fee, and repairs come with a 7-day warranty (per F-Fix's trust page). Exact pricing depends on the actual site — see reference pricing on each service page, or reach out via F-Fix contact channels.
In short: use drip timing as your main clue to the cause, then cut the power, place a container under the drip, and photograph the area as evidence. Have a technician suited to the cause inspect it. Don't cut into the ceiling yourself — you risk hitting wiring or making the problem worse.
If you're still not sure what's causing the leak from your ceiling, add F-Fix on LINE and send photos along with the drip timing and your location. The team will review it and let you know the next step.
Frequently Asked Questions (FAQ)
Is it dangerous to leave a ceiling leak for a long time?
Prolonged moisture buildup can swell, sag, or grow mold on the ceiling panel, and water near wiring risks a short circuit. Cut power to the circuit near the leak and check the cause as soon as you notice staining — don't wait until it's dripping continuously.
Do I need to open up the ceiling myself before the technician arrives?
No — prying or cutting into the ceiling yourself risks hitting wiring or damaging the ceiling frame further. What you can do is cut power nearby, place a container under the drip, and photograph the affected area for the technician to assess.
How do I know if the leak is from the AC pipe and not the roof?
Focus on the timing. If water only drips while the AC is running and stops once it's turned off, it's usually a clogged or disconnected AC drain pipe — unlike a roof leak, which is mainly tied to rainfall.
If the cause is both the roof and the bathroom waterproofing at once, how many technicians do I need?
It depends on the root cause found on site. Some cases need more than one specialist, such as a roof repair technician and a waterproofing technician working separately. The team will help assess the issue and match you with the right technicians before work begins.