Two new houses were built on an end terrace plot. Extra space was achieved by underpinning the end terrace wall and creating a new concrete basement. The concrete was poured in several stages resulting in a porous structure which leaked once hydrostatic pressure was applied.
We crucially reinforced all weak points using Vandex Waterplug and Vandex BB75E. This resulted in a Type B effective water barrier, an appropriate base for the cavity drain membrane system with a sump chamber in the light well of each property.
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