Below Ground Waterproofing or Tanking refers to the practice of completely waterproofing any area below ground.
Tanking membranes are applied to a building in order to provide a physical barrier to prevent the ingress of water. Tanking membranes should withstand constant hydrostatic pressure without failure. In order for a building to be considered ‘fully tanked’ all areas below ground would be fully encapsulated in a membrane like our Volclay Voltex or Volclay Swelltite (BRANZ appraised membrane) as a true tanking membrane.
While it is possible to ‘Peel and Stick’ or “single layer torch-on” type membranes for below ground walls Allco do not recommend this practice.
For habitable spaces below grade we strongly recommend using a true tanking membrane (Volclay) because almost every site will experience some form of hydrostatic pressure over the lifetime of the building