INTERNAL & EXTERNAL WATERPROOFING
To perform an Internal Waterproofing is required when earth bears against a structure, whether its 100mm or 10 meters. This is because earth provides a passage for water under pressure contained in the ground to enter the fabric of the building.
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 listed below.
TYPE A – (BARRIER) PROTECTION
Protection against water ingress into usable spaces which is provided by incorporation of an appropriate internal water management system.
TYPE B – (STRUCTURALLY INTEGRAL) PROTECTION
Protection against water ingress which is provided by the structure.
TYPE C – (DRAINED) PROTECTION
Protection against water ingress into usable spaces which is provided by incorporation of an appropriate internal water management system.