The Volclay® Waterproofing System consists of products that are based on or
use sodium bentonite as the principle waterproofing component. The system is used as a
damp-proofing or waterproofing membrane below ground to protect basements and other
underground structures against water penetration and water vapour transmission from
the ground. The system is also used to waterproof plaza decks where they act as a roof to
spaces below. The system is based on two membranes, Voltex® and Swelltite®, with other
accessory products completing the system.
Scope of use
The Volclay® Waterproofing System has been appraised for use as:
- an external waterproof tanking membrane to in-situ concrete, precast concrete and
concrete masonry basement constructions subject to hydrostatic pressures of up to 2
bar (20 metres); and,
- a damp-proof membrane (DPM) to slab-on-ground and basement constructions; and,
- a waterproof membrane to plaza deck roof structures.
The Volclay® Waterproofing System must:
- be used adequately confined and protected against damage during construction and in
- not be used where ground water conductivity exceeds 2,500 µS/cm-1 except on advice
from Allco Waterproofing Solutions
All installations incorporating the Volclay® Waterproofing System must be the
subject of specific design. Building designers are responsible for the incorporation of the
system following the guidance details provided by Allco Waterproofing Solutions Ltd. The
designer must provide design and installation detailing within the contract documents.
The Volclay® Waterproofing System must be installed by Allco Waterproofing
Solutions Ltd Approved and Trained Applicators.
New Zealand Building Code (NZBC)
The product will, if employed in accordance with the supplier's installation and maintenance requirements, assist with meeting the following provisions of the building code:
- Clause B1 Structure: Performance B1.3.2, B1.3.3(e)
- Clause B2 Durability: Performance B2.3.1(a)
- Clause E2 External moisture: Performance E2.3.3
- Clause F2 Hazardous building materials: Performance F2.3.1
Annual inspections must be made of the membrane top
edge seal and protection, the backfill capping, subsoil drainage
system and plaza deck finishing ensuring all are functioning as
If required, the drainage system must be cleared to
remove any sediment or silt build-up. The slope of the backfill
capping must be maintained at all times.