When water shows up inside a building, the stain on the ceiling or the wet carpet is rarely directly below where the water got in. Water travels along slabs, frames, cavities and fixings before it appears. That is why so many leak repairs fail: someone seals the obvious spot, the next storm arrives, and the leak is still there.
Facade water testing is how you stop guessing. It means wetting specific parts of the facade in a controlled way, one at a time, while someone watches inside, until the entry point is found. Here is how it works when we do it from rope access, and what you should expect in the report.
When water testing is worth doing
Testing makes sense when a leak keeps coming back, when the source is not obvious, or when several possible entry points sit close together. Common situations include:
- Leaks that only appear in storms or with wind from a certain direction
- Water around window heads, sills or reveals on upper floors
- Repeated repairs that have not fixed the problem
- Disputes between owners, strata and builders about where water is coming from
- Scoping remedial work before a larger sealing or painting project
If your leaks are tied to storms, our article on building leaks and wind-driven rain in Sydney explains why some leaks only show up in certain weather.
Step 1: Gathering information first
Before anyone gets wet, we want to know as much as possible about the leak. When does it happen? Which weather? How much water? Has anything been repaired already? Photos from occupants, building manager notes and any previous reports help us narrow down which facade details are worth testing.
We then inspect the area inside and look at the facade around and above the leak location. That gives us a shortlist of likely entry points, such as window perimeters, joints, penetrations, balcony edges or cracks.
Step 2: Targeted testing from rope access
On mid and high-rise buildings, the suspect details are usually out of reach from inside or from the ground. Rope access lets a technician position directly at each detail and test it at close range without scaffolding or a swing stage.
The key principle is isolation. We test one detail at a time, starting low and working up, because water applied higher on the facade runs down over everything below it. A typical sequence looks like this:
- Wet a single detail, such as a window sill joint, using a controlled spray or flood
- Hold that for a set period while the inside observer watches for water
- If nothing appears, move to the next detail up, such as the jamb or head
- Record the time, location and result of each test
- When water appears inside, repeat the test on that detail to confirm it
Testing is controlled and limited to the details being checked. It is not a general hose-down of the building, which tends to create more confusion than answers.
Step 3: Observation inside
Someone needs to be inside the affected unit or area for the whole test, in contact with the technician on the rope. They watch the ceiling, window frames, skirting and any known leak point, and report the moment water appears. Access to the unit needs to be arranged in advance with the occupant, strata or building manager.
Some leaks take a while to show, so a test may need to run for longer, or the result may only show up after a delay. We note this in the report rather than calling a result too early.
Step 4: Isolating the entry point
Once a test produces water inside, we look closely at that detail to understand why. It might be failed sealant, a gap at a flashing, a cracked joint, a blocked weep hole or a defect in the window frame itself. Sometimes more than one detail contributes, and we keep testing until the other suspects are ruled in or out.
What you get in the report
The report is what turns a day of testing into something you can act on. Ours typically include:
- A summary of the leak history and what was tested
- Each test location marked by elevation, level and drop
- Photos of every detail tested, outside and inside
- Test duration and result for each location
- The confirmed or likely entry point, with close-up photos of the defect
- Recommended repairs, and any details we suggest monitoring
The repair recommendations are practical. If it is a sealant failure, we will say so and explain the replacement needed. Our caulking and sealing service covers that kind of work. If the cause sits with the window manufacturer, a waterproofing membrane or a structural element, we will say that too, so the right trade or consultant can be engaged.
Testing and repair together
Because the technician is already at the detail, minor defects can sometimes be repaired soon after testing, once the committee or owner has approved the work. After repair, a retest on the same detail confirms whether the fix has worked. More detail is on our high-rise leak detection page.
Frequently asked questions
Does facade water testing damage the building?
Testing introduces water at the leak, so some water will appear inside where the defect is. We agree with the occupant beforehand how the area will be protected, and we stop each test as soon as water is seen.
Can testing be done in any weather?
It is best done in dry conditions, so that any water seen inside comes from the test and not from rain. Strong wind also affects rope access work, so we schedule around the forecast.
How long does a water test take?
It depends on the number of details being tested and how quickly the leak responds. A single window may be quick, while several suspect details over multiple levels will take longer. We give an estimate once we have seen the area.
Talk to Ace Abseiling
Ace Abseiling is a Sydney painting and remedial contractor working on industrial rope access, with NSW Contractor Licence 465770C and $20M public liability. If you have a leak that will not go away, contact us or call 1300 926 176 to arrange facade water testing.
