Guides
The whole subject, written down
Including the parts a contractor has no commercial reason to tell you. Read all of them and you will be able to brief a contractor properly and tell a real quote from a cheap one, whoever ends up doing the work.
- Fifteen situations where injection is the wrong repairThe fifteen situations where crack injection is the wrong repair, what the real problem is in each one, and which trade you should be calling instead.Read it
- Two different trades, one confusing nameResin injection means two unrelated trades in Australia: sealing water paths inside concrete, and injecting the ground under a slab to lift it. This explains which one your problem needs.Read it
- What polyurethane injection is, in plain EnglishA plain-English explanation of what polyurethane crack injection actually is, what happens on site, what the numbers mean, and what every term in the quote translates to.Read it
- Does it actually work, and for how long?An honest account of when injection is a permanent repair, the three ways it fails, and a step-by-step test for working out whether a repair that leaked again was the contractor's fault or a new problem.Read it
- Hydrophilic or hydrophobic: the argument nobody settlesBoth manufacturer camps claim their chemistry is always right, and both are commercially motivated. Here is the honest version, and the single question that actually decides which resin your crack needs.Read it
- What crack injection actually costs in AustraliaA published, itemised price guide for concrete crack injection and leak sealing in Australia, showing the rate card, the reason competing quotes never agree, and three jobs costed line by line.Read it
- Polyurethane or epoxy? It depends on one questionPolyurethane and epoxy injection do completely different jobs, and the choice comes down to whether you have a water problem or a strength problem.Read it
- Should you do this yourself?An honest answer to whether you can inject a concrete crack yourself in Australia: what you genuinely cannot buy, the narrow case where doing it yourself is fine, and the two health hazards that make everything else a licensed job.Read it
- Where negative side sits under Australian standardsA careful account of where sealing from the dry side sits under Australian standards and the National Construction Code, what the QBCC statutory warranties mean for "no warranty" clauses, and the written advice that has to be issued before the work rather than after it.Read it
- How to scope and tender a water ingress repairA scope-of-works template a body corporate committee can copy, plus how to normalise competing quotes, structure the AGM cost paper, and decide when a special levy is actually required.Read it
- White powder on a concrete wall: what efflorescence is telling youEfflorescence is not damage. It is evidence — proof that water has moved through the wall and evaporated off the face. That makes it one of the most useful diagnostic signs available, and one of the most consistently misread.Read it
- Is this crack structural? How to read a crack in concreteThree properties settle it: how wide the crack is, what shape it makes, and whether it is still moving. Any contractor pricing a repair without establishing the third one is guessing, and a crack that is still moving will crack again beside whatever goes into it.Read it
- Acrylate gel and curtain injection, explainedThe third injection chemistry, and the least written about in Australia. Acrylate gel permeates rather than fills, which makes it the only option for treating the ground behind a wall — and a poor substitute for foam on a running leak.Read it
- Tanking, injection, drained cavity or excavation: which one a wet basement needsCrack injection, crystalline tanking, a drained cavity system and excavation with an external membrane solve different problems. Choosing between them turns on whether the water arrives along a defined path or through the whole face — and on whether anybody can dig.Read it
- Twelve questions to ask before accepting a waterproofing quoteTwelve questions, each answerable in a sentence, that make three incomparable quotes comparable. None of them require any technical knowledge to ask, and the pattern of the answers is more informative than the prices.Read it
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Working out what the problem is first — fifteen situations where injection is the wrong repair