Vandex BB75 / BB75 Z / BB White
- BBA approved & CE marked
- WRAS approved for drinking water structures
- For concrete, masonry, and render
- Our best-selling tanking slurry
For a high quality, professional-use and ready mixed surface waterproofer, the BBA-approved and CE-marked Drybase Tanking Slurry is here. Available in conveniently-sized 25kg bags. Save up to 24% on bulk orders with Drybase.
Vandex BB75 is a high-performance tanking slurry for use on concrete, masonry, and render. It can be applied by trowel or spray.
Once cured, Vandex BB75 forms a waterproof coating that has been tested up to 7 bar. Where an elasticised coating is required, Vandex BB75 can be used in conjunction with Vandex Cemelast or Vandex PK75 elasticising additives.
Where a rapid curing time is required, consideration should be given to the use of Vandex Rapid S.
Applications
- Basement waterproofing plaster
- Waterproofing underground car parks, lift pits
- Waterproofing tanks, reservoirs, and water treatment works
- Sewer and sewage treatment plant waterproofing (Vandex BB75-Z)
- Waterproofing of aquariums, fish ponds, and water features
Alternative Products
Vandex BB White
Vandex BB White is a version of BB75 based on white cement. It is typically used as a tanking slurry on exposed surfaces - e.g. potable water reservoirs. Note: Vandex BB White is not compatible with Vandex Cemelast or Vandex PK75 elasticising additives.
Vandex BB75-Z
Vandex BB75-Z is a version of BB75 with enhanced sulphate resisting properties. For this reason it is typically used when sealing against ground water containing sulphates or when waterproofing open tanks and channels in sewage treatment plants. Vandex BB75-Z can be used in conjunction with Vandex PK75 to produce an elasticised coating.
Approvals:
Vandex BB75 is BBA approved.
Vandex BB75 and Vandex BB75-Z are CE marked under the EN1504-3 standard.
Vandex BB75 and Vandex BB White are WRAS approved for use in drinking water structures.
Vandex BB75 / BB White / BB75 Z Application Instructions
Preparation
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Surfaces to receive Vandex BB75 treatment must have a clean and well-keyed surface to ensure maximum bonding. Structural defects must be fixed before treatment begins [1].
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Remove all surface laitance, shutter release agent, curing compound, loose particles, etc. by means of light, wet or dry sandblasting, high pressure water jetting or wire brushing.
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Carefully rinse (pre-water) all surfaces to recieve Vandex BB75. Pre-water several times so that the substrate is thoroughly saturated. When Vandex BB75 is applied, the surface should be damp but not wet. Any surface water on horizontal surfaces must be removed.
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Place 25 kg of Vandex BB75 into a clean container, then add 4.5 - 6 litres of water. Stir for at least 3 minutes with a mechanical mixer.
[1] For more details of structural defects that must be repaired prior to Vandex BB75 application, refer to the Vandex BB75 application guidelines, which can be downloaded in PDF format from the downloads tab at the top of this page.
Application
Table 1: Thickness of each layer of Vandex BB75 (2 layers maximum)
| Minimum layer thickness per layer |
1.5 mm |
| Maximum layer thickness per layer |
2.0 mm |
| Maximum layer thickness in total |
5.0 mm |
Do not apply Vandex BB75 at temperatures below 5°C (40°F) or to a frozen substrate.
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To apply Vandex BB75 by brush, it should be applied from the bottom upwards, and any excess should be worked sideways. All cavities and air holes must be filled, thereby excluding trapped air. If two layers are applied, it is recommended that the second layer is applied whilst the first layer is still damp on the surface [2].
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To apply Vandex BB75 by trowel, an initial scape coat is applied for maximum adhesion to the substrate, working from the bottom up. All cavities and air holes must be filled, thereby excluding trapped air. The first layer is then applied to the thickness specified in Table 1 above. If two layers are applied, it is recommended that the second layer is applied whilst the first layer is still damp on the surface [2].
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To spray Vandex BB75, a suitable fine mortar spraying device must be used. The amount of material required and the air used must be adjustable so that the optimum spray pattern can be achieved. The nozzle diameter should be approximately 6 mm, depending on the spray gun used. The compressor performance must be at least 5 bar pressure, delivering 500 l/min.
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To apply Vandex BB75 with a spray applicator, the first layer is applied using a circular motion with the sprayer [3]. If two layers are applied, it is recommended that the second layer is applied whilst the first layer is still damp on the surface [2]. The final layer can be left direct as a spray finish or smoothed finely with the trowel.
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If using a spray applicator, the spray finish provides an "orange peel" texture which is easy to clean.
[2] The waiting time before applying the second layer is approximately 2 - 4 hours, depending on local climatic conditions such as humidity, temperature, etc. The first layer must not be damaged during application of the second layer.
[3] The nozzle must be held at a 90° angle to the substrate being treated and the distance between the nozzle and the surface will vary depending on the spray gun/compressed air used.
