CASE STUDY SEALING WATER INGRESS IN WATFORD TUNNEL ROOF THE CHALLENGE In Watford, UK, an existing tunnel needed immediate refurbishment as the brickwork was in poor condition with unacceptable water ingress. However, before any injection work could be undertaken to rectify the water ingress, the brickwork had to be supported by steel straps and timber. The sealing work had to be done over two weekends, requiring both Saturday and Sunday night shifts. MINOVA APPROACH TO SOLVE PROBLEM To solve the problem, Minova provided both expert management and an installaton team to develop a plan for drilling and injection during the short time frame given. To drill and inject Carbostop U and CarboCrackSeal H plus. Drilling was done around the arch of the tunnel, starting and stopping at 1

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