Structurally integral protection against water ingress & drained protection against water ingress

Type B Waterproofing System

Type B waterproofing is classified in BS8012 as a structurally integral protection against water ingress, which is provided by the structure. Structures providing Type B protection should be constructed of reinforced concrete of structural steel and designed in accordance with the relevant part of BS EN 1992 (all parts) respectively. This type of waterproofing protection is actually integrated into the concrete structure and typical products used include water resisting admixtures compiling with Table 9 of BS EN 934-2:2009 (Admixtures for concrete, mortar and grout) for watertight concrete combined with appropriate joint sealing systems for connections, construction and movement joints.

Type C  Waterproofing System

Type C waterproofing is classified in BS8012 as a drained protection against water ingress into usable spaces. Type C waterproofing protection manages water that penetrates the external shell of the structure, by collecting it in a cavity formed between the external wall and internal lining / wall. There is a permanent reliance on this cavity to collect groundwater seepage and direct it to a suitable discharge point, e.g. drains of a sump for removal by gravity drainage of mechanical pumping.