Vandex BB75 Waterproofing Slurry
Vandex BB75 is a cementitious waterproofing slurry (tanking slurry) with hydrophobic properties, resistant to water and moisture.
Vandex BB75 is applied by trowel or spray to surfaces such as concrete, masonry, and render, which have to be sealed and protected against the influence of water and moisture. Typical areas of application include:
- Basement / cellar waterproofing and refurbishment
- Underground car parks
- Retaining walls
- Lift pits
- Tanks / reservoirs / water treatment works
- Sewer / sewage treatment plant waterproofing (BB75 Z)
- Fish ponds & water features
Once cured, Vandex BB75 tanking slurry forms a waterproof coating (tested up to 7 bar). It can be employed against active and passive water pressures, and is approved for use in contact with potable water. The initial and final bonding capability of Vandex BB75 is excellent, making it suitable for application to horizontal as well as vertical surfaces. It is durable, resistant to frost and heat after setting, whilst remaining vapour-permeable. The properties of Vandex BB75 can be further enhanced by using the "Vandex PK75" or "Vandex Cemelast Liquid" polymers as a gauging solution – the resulting products being referred to as Vandex BB75‑E and Vandex Cemelast.
Vandex BB75 is not intended to provide a decorative finish. In most cases, the Vandex BB75 waterproofing layer is covered with a suitable plaster such as Vandex Refurbishment Plaster.
Vandex BB White
Vandex BB White is a version of Vandex BB75 based on white Portland cement. Its characteristic white colour makes it particularly suitable for use on exposed surfaces, e.g. potable water reservoirs.
Vandex BB75 Z
Vandex BB75 / BB White / BB75 Z Application
 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.
|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.
 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.
 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.
For maximum effectiveness, it is essential that the applied layers of Vandex BB75 are kept damp for at least 5 days and protected against evaporation by sun and wind. Careful post-watering should be carried out at intervals, starting from the day following the application. Alternatively, the surfaces can be covered with plastic sheeting, wet mats or moist sand. The use of curing compounds is not recommended.
The freshly treated surfaces should be protected from rain for a minimum period of 24 hours. Surfaces treated with Vandex BB75 should be protected from frost for at least 5 days. If necessary, cover them with insulation mats.
Detailed application instructions can be found in the Vandex BB75 application guidelines, which can be downloaded from the downloads tab at the top of this page.
Vandex BB75 is covered by BBA certificate number 90/2516.
Vandex BB75 is CE marked in compliance with EN1504-2. It is approved under WRAS in the UK for use in drinking water structures.
Suggested NBS specification clause: J10-110, J30-110
Visit our NBS page for further information on specifying Safeguard products using NBS.