Waterproofing is required when earth bears against a structure, whether its 100mm or 10 metres. This is because earth provides a passage for water under pressure contained inthe ground to enter the fabric of the building.
Under pavement vault application
Any structure can be affected by water penetration whether its a small residential or large commercial development. You need to protect your property from this ingress of water.
Protection can be achieved using a number of methods. British Standard BS8102 2009 code of practice for protection of below ground structures against water from the ground defines these methods into three types of waterproofing protection: