The Controlled Water Test is a highly effective, methodical leak detection service designed to precisely identify the point of water ingress on a roof, especially when visual inspection fails. It is a process of elimination requiring a team: a Sprayer on the roof and an Observer inside, maintaining constant radio contact.

The procedure isolates the problem area based on interior damage. The Sprayer applies water, simulating rainfall, to small, isolated zones using a garden hose. Crucially, the water application moves progressively upward and outward from the lowest roof features (e.g., drains, seams, then flashings). This systematic approach ensures that the moment water appears inside, it can be definitively linked to the most recently wetted roof section.

The Observer monitors the interior leak point, noting the exact time and location of water entry. Upon visual confirmation, the Sprayer immediately marks the source on the roof membrane. This precise identification is invaluable, eliminating guesswork and enabling roofing contractors to perform highly targeted, permanent, and cost-efficient repairs to the specific breach point.

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