Condo Leak Investigation: Tracing a Concealed Water Path More Than 40 Feet from the Source
A recurring kitchen ceiling leak persisted for years despite multiple roof inspections, localized repairs, penthouse fenestration re-caulking, and ultimately replacement of the penthouse roof assembly. The visible leakage occurred near the center of the building floor plate, providing little indication of the actual exterior source.
Hightower Labs reviewed the project history and prior repair efforts before mobilizing for a one-day diagnostic leak investigation. Targeted water testing identified a water-entry condition at the penthouse parapet and coping. Water entering the enclosure was able to migrate through concealed terrace construction for more than 40 feet before ultimately appearing at the kitchen ceiling below.
The investigation illustrates a fundamental challenge in building enclosure troubleshooting: the location where water becomes visible may have little relationship to the location where it entered the building.
A condominium owner had experienced recurring water leakage through the kitchen ceiling near the center of the building floor plate.
The apparent location of the leak naturally directed attention to the penthouse roof and terrace construction above. Over a period of years, substantial effort was made to address the problem.
Previous work reportedly included multiple roof inspections, localized roof repairs, re-caulking of penthouse fenestration, and eventual replacement of the penthouse roof assembly.
The leak persisted.
By the time Hightower Labs was contacted, the problem had survived multiple repair campaigns and significant expense without a verified source.
^ Back to TopThe prior efforts were not necessarily unreasonable. Each addressed building components that could plausibly contribute to leakage based on the location of the interior symptom.
The difficulty was that the location where water became visible inside the building did not reveal where water was entering the enclosure.
Without establishing the actual water-entry point and migration path, successive repairs continued to address suspected sources rather than a verified failure mechanism.
When the source of a leak has not been verified, additional repair work can become increasingly expensive without addressing the actual water-entry path.
Hightower Labs was engaged to conduct a targeted, forensic leak investigation and provide actionable recommendations.
^ Back to Top
Hightower Labs reviewed the project history, available photographs, and previously completed repair work before mobilizing for a one-day diagnostic investigation.
This review established an understanding of the relevant enclosure construction and helped identify conditions warranting further evaluation.
Rather than assuming that the remaining source was directly above the kitchen, the investigation considered the potential for water to enter elsewhere in the penthouse enclosure and migrate through concealed construction before appearing at the reported interior location.
Targeted testing of plausible sources near the reported leak did not reproduce the interior leakage.
Targeted water testing ultimately identified a water-entry condition at the penthouse parapet and coping.
^ Back to Top
Water entering the enclosure at the penthouse parapet was able to access concealed construction above the structural roof slab and migrate laterally across the terrace assembly.
More than 40 feet from the exterior entry location, the water encountered a pathway into the occupied space below and ultimately appeared at the kitchen ceiling.
The water was not simply passing vertically through the roof immediately above the affected ceiling.
It was entering at the building perimeter, migrating through concealed roof and terrace construction, traveling across the assembly, and only then finding a route into the occupied space below.
^ Back to Top
Nothing about the interior symptom pointed directly to the actual source.
Targeted testing of plausible sources near the reported leak did not reproduce the interior leakage.
The eventual finding required separating the location of the symptom from the location of water entry.
That distinction changed the investigation.
This case demonstrates a fundamental challenge in building enclosure troubleshooting:
The location where water becomes visible may have little relationship to the location where it entered the building.
Visual inspection and repair of plausible problem areas can be appropriate first steps. But when leakage persists after repeated repairs, continued remediation without source verification can become costly and ineffective.
At that point—or before capital-intensive remediation is undertaken—the objective should shift from:
“What should we repair next?”
to:
“Can we demonstrate how the water is getting in?”
Hightower Labs uses targeted water testing, building enclosure analysis, and controlled diagnostic methods to identify water-entry sources and understand how water moves through concealed assemblies.
In this case, a one-day investigation identified a concealed water path extending more than 40 feet from the exterior entry point to the reported interior leak.
| 📞 Contact Hightower Labs | |
|---|---|
| 📍 Service Region | North America |
| 🌐 Website | hightower-labs.com |
| ✉️ Email | service@hightower-labs.com |
| 📞 Phone | 312-897-3742 |
| Hightower Labs on LinkedIn | |
Persistent leaks demand real solutions. Contact Hightower Labs for expert leak investigation & building envelope consulting.
Independent studies, industry papers, slideshows, video presentations, and other content benefiting those in the industry with the patience to read five pages, and diagrams for the developers.
Industry-wide, invalid and improperly executed ASTM E783 test data are not providing a reliably accurate accounting of the building's air-tightness on window wall and curtain wall systems comprising the majority of envelopes built this century and, consequently, building stakeholders are blind to their property's performance.
In this Notes From The Field article, HTL checks in on the U.S. construction industry's widespread use and mis-use of structural glazing systems.
The BEAM03 procedure introduces a novel approach to evaluating building envelope water resistivity, addressing critical gaps in traditional QAQC practices. BEAM03 delivers reliable, repeatable data for assessing large-scale envelope performance, including complex geometries and system transitions.
Consider raising your expectations and building structures that are not defective monstrosities by augmenting your project with Chicago's very own building envelope QAQC services company.