The dual barrier protection waterproofing regime on this project was designed and installed by Midland Tanking
Primary System
Type A – External Barrier Protection
The external face of the external walls were then 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.
To prepare the external walls for the barrier protection waterproofing, all walls and slab were cleaned and repaired. The system requires a clean, flat and smooth surface on which to bond.
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 A –Internal Barrier Protection
The secondary barrier protection waterproofing system was a spray applied cementitious membrane. The walls & floor were repaired to create a smooth and flat surface. The floor has to be levelled locally to ensure no water could pool and interfere with the bond of the membrane. All surfaces (walls and floor) were meticulously cleaned and taken back to the lattice work of the substructure. This ensured a strong mechanical bond between the membrane and the structure.
The cementitious membrane was then sprayed on in two coats to complete the waterproofing.
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
