Leak Detection in Mole Valley

Leak detection across Mole Valley covers RH4, RH5, KT22, KT23 and KT24, taking in Dorking, Leatherhead, Bookham and Ashtead in Surrey. SES Water serves the north of the district and Sutton and East Surrey Water the south. The drive from the NW10 dispatch hub runs at 75 minutes. The Surrey Hills AONB edge is set with conservation rules that restrict external pipework and vent terminations, which shapes the leak-detection survey approach from the start.

AONB conservation handling is built into the workflow: no random external opening up, no exposed plastic on finished walls, careful use of any thermal-imaging or acoustic kit on protected stock. The survey starts with a Protimeter Surveymaster and Tramex pinless moisture map to fix the wet boundary precisely, then the FLIR E96 thermal camera (640x480 sensor, less than 0.04 degrees C differential) follows heating-circuit flow under solid floors and inside chimney breasts.

Pressure-decay testing across isolated sections of the central-heating primary circuit narrows the failure precisely before any of the original boards are lifted. The Sewerin Aquaphon A150 acoustic kit (rod microphone on accessible valves, ground microphone on screed) covers underfloor and concrete-slab leaks across the Dorking and Leatherhead stock. Hydrophone work on hot-water cylinders and loft cold-water tanks confirms whether the source is a vessel or a pipework leak.

For underground supply leaks across Bookham and Ashtead, where buried mains can run forty metres from kerb to meter on AONB-edge plots, the 5% hydrogen / 95% nitrogen tracer gas mix (BS EN 14338 compliant) is the standard tool. Sodium fluorescein and Rhodamine WT dye under a Spectroline OPX-365 UV lamp separates above-floor plumbing from waste-pipe failures on shower trays and bath wastes. Damp surveys close with a salt-test analysis (30 minutes on-site, 48-hour lab turnaround) for nitrate (rising), chloride (penetrating) or neutral (plumbing) salts. Every investigation generates an insurance-grade trace-and-access report accepted by LV, Aviva, Direct Line, Admiral, Hiscox, Zurich, AXA, RSA, NIG, Allianz, Ageas and Legal & General. Survey from a fixed starting fee, repair work at the M25-adjacent half-hour rate.