I. Introduction

Designers, contractors, and owners desire watertight roofing and waterproofing systems. Typically, after installation, there are two methods for testing the water tightness of these systems: flood testing1 and Electronic Leak Detection (ELD). Flood testing locates leaks, whereas ELD locates breaches in the membrane. A leak is defined as the actual appearance of water below the deck. A breach is defined as a defect in the membrane that allows surface water to reach the substrate below. In newly installed waterproofing systems, ELD is used as a quality control method to identify breaches so that installers can repair waterproofing deficiencies during or soon after installation. In addition, permanently installed systems can be left in place to actively monitor for moisture intrusion and allow for limited overburden removal and targeted repairs if a future breach occurs. This technical bulletin provides information on:

• Benefits of ELD.
• Requirements to effectively perform ELD.
• ELD testing methods.
• Conductive mediums.
• Fully monitored systems.

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Sincerely,

- Western States Roofing Contractors Association