Below, you’ll find answers to the most common questions about our certified conductive underlay, Electronic Leak Detection (ELD), Leak Prevention and testable waterproofing systems. If you don’t see your question here, feel free to contact us directly.
What is Electronic Leak Detection (ELD)?
Electronic Leak Detection (ELD) is a non-destructive testing method used to locate breaches or punctures in waterproofing membranes.
It works by applying an electrical current to the surface of the membrane. If there’s a defect, the current passes through and reaches a conductive layer beneath — where it’s detected by the equipment.
There are two main applications:
Leak Detection: Used reactively when water ingress has occurred
Integrity Testing: Used proactively during or after installation to confirm performance
ELD is only possible if the waterproofing system includes a reliable conductive layer — such as Controlit.
What is Electronic Leak Prevention (ELP)?
Electronic Leak Prevention (ELP) is a proactive strategy that uses ELD as a long-term Quality Control method — not just a test.
It ensures the waterproofing system is:
Testable by design
Inspected at key milestones
Maintainable over time
With Controlit installed, a roof becomes permanently testable — during construction, at handover, and for future maintenance.
ELP turns ELD from a one-time test into a lifecycle prevention tool.
What is Controlit?
Controlit is a smart conductive underlay installed directly under the waterproofing system.
It enables accurate, non-destructive Electronic Leak Detection (ELD) — both during construction and throughout the building’s lifecycle.
It is the compulsory requirement for accurate and repeatable testing over time.
Why is a conductive layer necessary?
ELD requires an electrical path from a defect in the membrane to a conductive layer below. Without it, the current can’t flow, and breaches cannot be detected. Controlit provides this path — reliably and uniformly.
Is Controlit a waterproofing membrane?
No. Controlit is not waterproofing. It is a conductive layer that supports ELD and sits directly beneath the membrane. It does not replace or interfere with the waterproofing system.
What ELD methods is Controlit compatible with?
Controlit supports both High Voltage (HV) and Low Voltage (LV) ELD.
What membrane types work with Controlit?
Controlit is compatible with:
Bitumen membranes
PVC and TPO membranes
EPDM
Can I test through gravel, tiles, or green roofs?
Testing is always recommend and should be prioritized on exposed surfaces.
Testing can be performed on overburden, but the system must be designed for and the right method must be used (trace wire + low-voltage).
Because of the variable testing accuracy on ballasted systems, we strongly recommend testing first on exposed membranes.
When should Controlit be installed?
During the waterproofing process — directly below the waterproofing layer(s).
Is special training required?
No. Standard waterproofing crews can install Controlit using our guide. Supervision is available if needed.
How long does Controlit last?
Controlit is built to last the full service life of the roof. It’s stable, durable, and remains conductive over time.
How often can ELD be performed using Controlit?
As often as needed — commonly:
After waterproofing installation – to confirm performance
Before final handover – after all works are completed and all trades are done
Annually or bi-annually during Preventive Maintenance
How is Controlit different from other Leak Detection methods?
Controlit’s goal is Leak Prevention, not Leak Detection. By enabling accurate and repeatable testing of the waterproofing system Controlit ELP (Electronic Leak Prevention) system prevents water damage entirely.
Traditional methods (flood testing, visual checks, infrared) often only reveal leaks after water has intruded. Controlit’s approach makes membranes ELD-ready, so you can conduct proactive testing and quickly isolate potential breaches without guesswork, even years after installation.
Where can I find more technical information?
Check out our Technical Documents page. You can also reach out to our team via the Contact Form.
Does it add significant cost to my project?
The extra cost of Controlit underlays is usually a small fraction of the overall roofing or construction budget—yet the savings from preventing water damage, downtime, and repairs often far outweigh the initial investment. Most owners consider it a cost-effective insurance policy against hidden leaks.
If your situation involves specific needs like ELD for swimming pools or unique membrane combinations, we’re here to help. Our expert team can provide tailored recommendations and additional documentation to meet your requirements.
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