Last updated: 2026-10-10
Seepwise arranges PU injection waterproofing in Singapore: a non-hacking repair where polyurethane resin is pumped into the cracks and joints a leak travels through. It avoids the noise, dust and permit of hacking, and it suits some leaks well and others not at all.
What happens on the first visit
The specialist confirms the leak path first, because injection only works if the water is travelling through cracks or joints that can be reached and filled. If the membrane under a toilet floor has failed across the whole area, injection is the wrong tool and you are told so.
How PU injection works
Small holes are drilled along the crack or joint, injection ports are fitted, and polyurethane resin is pumped in under pressure. The resin reacts with moisture, expands and fills the path the water was taking. The ports are removed and the holes sealed.
When it fits, and when it does not
| Situation | PU injection | Re-screeding |
|---|---|---|
| --- | --- | --- |
| Leak along a specific crack or joint | Good fit | Works, more disruptive |
| Cannot hack (new BTO warranty, rental, timing) | Useful stopgap | Not possible yet |
| Want a long-term renewal | Partial | Yes |
HDB's own description of the most effective ceiling-leak fix is re-screeding (HDB). Injection is the alternative when hacking is not possible or the leak is localised.
What to ask before agreeing to injection
- Where exactly will the ports go, and why there?
- What happens if the leak returns: is a re-injection included?
- Has the leak path been confirmed by a dye or ponding test?
- Would re-screeding be the better fix here, and why not?
What is included
- Leak path confirmed before injection
- Ports placed along the path
- Resin injected under pressure
- Ports removed and holes sealed
- Ceiling below checked after
- Honest note if re-screeding is the better fix
- Photos of port positions
- Written terms if the leak returns
Painting over it vs a quick fix vs a proper repair
| DIY | Quick fix | Proper repair | |
|---|---|---|---|
| Hacking | None | None | None |
| Leak path confirmed | No | Often not | Dye or ponding test first |
| Right method chosen | Guess | Injection for everything | Injection only where it fits |
| Return terms | None | Vague | Written |
| Membrane renewed | No | No | No: say so if needed |
What it costs
Injection is priced by the length of crack or joint after the leak path is confirmed.
Try the cost estimator or read the waterproofing cost guide.
Related guides
- Hacking vs Non-Hacking Waterproofing: Which Fixes Your Leak?
- Is My BTO Leak Covered by HDB's Warranty?
- How Much Does Ceiling Leak Repair Cost in Singapore (2026)?
How it is done
- Confirm the path. Dye or ponding test shows where water travels.
- Drill and port. Small holes along the crack or joint.
- Inject. PU resin fills the path under pressure.
- Seal and check. Ports out, holes sealed, ceiling below checked.