The waterproofing regime on this project had to include a combined-protection system to ensure no leaks would occur from above or below. Midland Tanking was the designer and installer for both systems.
Primary Combined System
Type A – Barrier protection
The deck was thoroughly cleaned and primed with an adhesive primer. Once dry, the liquid applied membrane.
Type B – Waterproof concrete integral protection
The concrete deck was created using a “rib deck” system and was cast with concrete including a waterproof additive. The steel reinforcing within this structure was designed to reduce the cracking to less than 0.3mm, also providing integral protection.
Dual Internal System
Type A – Barrier Protection
The walls and floor were all coated with a two coat crystalising waterproofing slurry this provides most of the waterproofing protection
Type C – Drained cavity protection
With the primary waterproof concrete system providing most of the protection, the secondary system was installed. At the base of all external walls a recessed concrete channel was created within the slab. All walls and the floor were lined with a cavity drainage membrane (CDM). These membranes were linked to sump chambers via the recessed perimeter channels. Within the sump is two pumps and a high-level alarm. This system is designed to catch any water that is not stopped by the primary system and discharge it automatically. Flushing and maintenance points were installed to allow future servicing of the system. The front and rear lower sections are linked with a underground pipe.
Both waterproofing systems were designed by Structural Surveyors in Structural Waterproofing (CSSW) in accordance with BS8102:2009
All waterproofing materials were supplied by Triton Systems Ltd
