Below Ground Tanking
Below ground tanking is a waterproofing system designed to prevent water ingress into structures that sit below ground level — permanently protecting basements, foundations, retaining walls, and below-ground service areas.
Our Systems & Expertise
We work with trusted, industry-proven systems including:
- Sikaproof membrane systems
- Bentonite sheet membranes
These sheet membrane systems create a continuous barrier against groundwater and hydrostatic pressure. Our team understands the critical detailing required around joints, penetrations, construction seams, and service entries — all points where failures commonly occur if not installed correctly.
Where Below Ground Tanking Is Used
- Basements
- Retaining walls
- Foundations and footings
- Lift pits
- Tunnels
- Below-ground service areas
Why Specialist Installation Matters
Because these systems become permanently enclosed once installed, engaging an approved applicator is essential to ensure compliance, durability, and performance. Gunac brings 40+ years of waterproofing expertise and a thorough understanding of soil conditions, water tables, and structural design requirements.
Proudly servicing Auckland, Waikato, and Bay of Plenty.