Introduction to CONTROLIT and ELD

  1. What is Controlit and how is it used in roofing?

Controlit is a premium conductive underlay used under waterproofing membranes for electronic leak detection (ELD). It ensures precise damages detection and integrity testing of waterproofing membranes.

  1. What is Electronic Leak Detection (ELD) and how does it work?

Electronic Leak Detection (ELD) is a testing method used to identify and locate leaks in waterproofing membranes, particularly in flat roofing systems. It operates by applying an electrical current across the membrane surface, with breaches detected through the disruption of this current. This non-invasive method allows for precise pinpointing of damages and leaks.

  1. How does Controlit differ from traditional waterproofing methods?

CONTROLIT is not a waterproofing material. It is a conductive underlay with main function to provide long-term electrical conductivity underneath the waterproofing, allowing for regular Electronic Leak Detection and integrity testing.

  1. Is Electronic Leak Detection testing covered by any standard?

ELD methods are covered by ASTM 7877-14 “Electronic Methods for Detecting and Locating Leaks in Waterproof Membranes ».

  1. Why do you need a conductive underlay to perform ELD?

ASTM Guide D7877 sections 4.4 & 5.5 clearly state that the substrate directly/immediately below the membrane must be conductive. When the waterproofing is installed on top of a non-conductive substrate, the addition of a conductive underlay is required to perform ELD testing effectively.

  1. Can CONTROLIT be used with all ELD methods?

Yes, CONTROLIT enhances all ELD methods, be it high-voltage (or “dry method”) or low-voltage (“wet method”). 


Benefits and Applications

  1. Why is ELD important for my building's roof?

ELD is crucial for identifying potential leak early, preventing extensive damage, and ensuring the longevity and safety of the waterproofing system & the building integrity. This is a great tool to enhance preventive maintenance.

  1. What are the main benefits of using Controlit & ELD in building construction?

The main benefits include accurate leak detection, prevention of water damage, prolonged roof life, and overall cost savings in roof maintenance.

  1. Can Controlit be applied to all types of roofs?

ELD is typically performed on flat roofs and low sloped roofs. CONTROLIT underlays can be installed under different types of waterproofing, such as bituminous and synthetic membranes.

  1. How often should I schedule ELD for my building?

ELD testing should be performed after installation of the waterproofing, and before the building opening, after the installation of various equipments on the roof is done.

Regular ELD, such as annually or bi-annually, is recommended for preventive maintenance. It's also advised to perform ELD after every operation on the roof.


Technical Aspects and Accuracy

  1. How accurate is ELD in pinpointing leaks?

ELD is highly accurate in locating leaks, often pinpointing the exact location of a breach.

  1. Can ELD detect potential leaks before they fully develop?

Yes, ELD can identify damages in a membrane before they turn into active leaks.

  1. Is ELD a disruptive process? Will it affect my building’s operations?

ELD is non-invasive and typically does not disrupt building operations.

  1. What happens if a damage is detected? What are the next steps?

If damages are detected in the waterproofing membrane, they should be repaired by qualified professionals as soon as possible.


Cost, Efficiency, and Sustainability

  1. Is Controlit a cost-effective solution for roofing?

Yes, while the initial investment might be higher than a standard build-up, its effectiveness in preventing leaks and extending roof life will lead to long-term cost savings.

  1. Can Controlit contribute to a building's overall energy efficiency?

Consider that a wet insulation is 30% less efficient than dry. By ensuring the integrity of the roof, Controlit helps maintain the building's thermal envelope, contributing to energy efficiency. 

  1. Is Controlit environmentally friendly or sustainable?

The ability of Controlit to detect leaks early can prevent water damage and reduce waste, contributing to sustainability. 

  1. How long does Controlit last compared to the waterproofing systems?

Controlit is designed for longevity and typically matches or exceeds the lifespan of the waterproofing membrane it's paired with.

  1. What kind of warranty or guarantee comes with Controlit?

Our underlays have a 10-year warranty.




Ltd “Controlit Factory” 27.03.2024. signed an agreement No.17.1-1-L-2024/173  with the Investment and Development Agency of Latvia on receiving support for export assistance under the project “SME Innovative Business Development” co-financed by the European Regional Development Fund.