The waterproofing regime on this project had to include a dual-protection system to satisfy the requirements of the warranty provider. These were a external bitumen waterproofing system and an integral waterproofing system. Beautiful Basements was the designer and installer for both systems.
Primary System
Type A – External bitumen waterproofing – Barrier Protection
The external face of the external walls were all treated with a spray applied, liquid membrane. The external bitumen waterproofing system relies on the two coat bitumen to become permanently homogenous to stop water bearing against the structure.
Once primed, the walls are sprayed with the first coat which is approximately 5mm thick. This has a fibre glass sheet pressed into it to give extra strength. A second coat is then applied over the fibre glass, completing the installation.
To protect the new system from damage during back filling, a sheet of insulation is applied to the all of the walls.
Secondary System
Type B – Waterproof concrete integral protection
All external walls, all concrete slabs (ground and basement floor) were 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. All construction and day joints have a crystalising waterproofing slurry and an expanding waterbar applied to them to waterproof natural weak points.
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
