Process
How a waterproofing repair works.
Four steps, in order. The same process whether the job is a leaking basement crack, a failed balcony junction, or a strata planter box — diagnose, prepare, inject, verify.
Diagnose
Before any repair is specified, we identify the source of the water ingress. This may involve visual inspection, thermal imaging, moisture mapping, dye testing, or flood testing — depending on where the leak is and how it presents. The goal is to locate the failure point, not just the symptom.
A leak that appears in a ceiling may originate metres away. Diagnosis is the step that prevents repairing the wrong spot.
Prepare
The substrate is prepared to accept the repair. For injection, this means cleaning the crack or joint, routing it to sound concrete, and drilling and setting injection packers at intervals. For membrane work, this means removing degraded material, cleaning the surface, and ensuring the substrate is sound and dry enough to bond.
Preparation is the step most often skipped. A repair applied to a contaminated or unsound substrate will fail.
Inject or apply
For polyurethane injection, resin is pumped through the packers under high pressure until it fills the crack or joint and exits at the surface — confirming full penetration. The resin type (hydrophilic or hydrophobic) is selected for the conditions: active leak, expected movement, and structural requirement. For membrane work, the specified system is applied to the prepared substrate in the correct sequence and coverage.
Injection pressure and resin selection are matched to the crack width, the water volume, and the substrate condition — not a default.
Verify
The repair is tested before the site is handed back. For injection, this means observing the sealed crack under the same conditions that caused the leak — water test if necessary. For membrane work, this means a coverage inspection and, where required, a flood test. Packers are removed, drill holes are sealed, and the area is cleaned.
If the repair doesn't hold under test, it isn't finished. We verify before we leave, not after.
The process matters because waterproofing failures are rarely what they appear to be. A stain on a ceiling tells you where the water arrives, not where it enters. A wet wall tells you the membrane has failed, not where. Skipping diagnosis — or skipping verification — is how the same leak gets repaired twice.
We follow this sequence on every job. The person who diagnoses the leak is the person who specifies the fix and carries out the repair. No handoff, no assumption, no quote written by someone who won't be on site.
Have a leak that needs diagnosing?
Send a few details about where the water is appearing and we'll start with diagnosis — not a quote.