Hi, in a normal house the wall is usually tanked to about a meter high as water cant rise above 6/700 mm above ground level in most cases due to gravity. But a basement flat. Will be a different as your already below ground. In a basement situation firms usually lay a concreate floor with a drain in the low point & let any water in behind a special wall membrane that looks like an egg box that comes in rolls about 25met long. So you end up with a small void in the walls & floor & diverting the water to the drain which either goes away with gravity or may have a pump with a float switch to pump the water away. A basement is defiantly a specialist area & would recommend a qualified firm as it’s a question that will be asked when selling a basement flat & will need certification & guarantees., .
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