# PU Injection Waterproofing Singapore | Non-Hacking Leak Repair | Seepwise > PU injection waterproofing in Singapore: how non-hacking leak repair works, when it fits, when it does not, and how it compares with re-screeding. URL: https://waterproofing.affiliateinsider.buzz/pu-injection-leak-repair/ - Home - / PU injection leak repair # PU Injection Waterproofing in Singapore Seal the crack the water travels through, without hacking the floor. Good for the right leak, wrong for a failed membrane. [Request an inspection](#request) 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](https://www.mynicehome.gov.sg/hdb-how-to/maintain-your-flat/)). 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](/tools/waterproofing-cost-estimator/) or read the [waterproofing cost guide](/guide/waterproofing-cost-singapore/). ## 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. Water dripping now? Switch off any circuit near the drip, put a bucket under it and photograph the stain with the time. Then send a request and tick "dripping right now". [What to do in an active leak](/emergency-leak-repair/) Standards and methods - Moisture mapping before quoting - Ponding test 24h+ on wet areas - Membrane turned up the walls - HDB permit for hacking, via the contractor - BCA workhead CR13 for waterproofing installers Request pu injection leak repair A specialist calls you back to book an inspection. Request received. A specialist will contact you on the number you gave. If water is near electrics, switch off that circuit at the distribution board and keep clear until then. Get pu injection leak repair quoted after a proper inspection. A specialist calls you back to book an inspection. Tell us what you see and the type of home. [Request an inspection](/contact/#request) ## Questions people ask Is PU injection a permanent fix? + It can last well for a localised crack, but it does not replace a failed membrane. For a membrane failure, re-screeding is the long-term fix. Does PU injection need an HDB permit? + Injection does not hack the floor. Hacking is what generally triggers the permit; confirm with your contractor for your flat. Can PU injection be done in a new BTO flat? + If the flat is under warranty, report the leak to HDB first: changing tiles or the waterproofing can end the warranty. How long does it take? + Typically far shorter than a re-screed, because nothing is hacked and no ponding test of a new membrane is needed. The specialist confirms after inspection. Is there a charge for sending a request? + No. Sending a request costs nothing. The specialist explains any inspection fee before the visit. ## Related services [Ceiling leak repairFind where the water enters, fix it at the source, and know who pays before work starts.](/ceiling-leak-repair/)[Toilet waterproofingA wet area that stays dry for years needs three things done in order: membrane, screed, test.](/toilet-waterproofing/)[Water leak detectionFind it before you hack it. Detection is cheaper than opening the wrong wall.](/water-leak-detection/)