Below Ground Tanking
Working with an experienced waterproofing specialist for below ground tanking ensures your structure remains watertight from the very beginning. At Gunac | Waterproofing Specialists, we understand that once a membrane is covered by concrete or backfill, access is limited. That is why correct specification, detailing, and installation are critical.
What Is Below Ground Tanking?
Below ground tanking is a waterproofing system designed to prevent water ingress into structures that sit below ground level. These systems are typically installed on surfaces that will later be concealed by:
Concrete slabs and foundations
Backfilling against retaining walls
Screeds and tiled finishes
Structural basement walls
Because these systems become permanently enclosed, engaging an approved applicator for your specified product is essential to ensure compliance, durability, and performance.
Our Systems and Expertise
We have delivered numerous below ground tanking projects across commercial and residential developments. We work with trusted, industry-proven systems such as:
Sikaproof membrane systems
Bentonite sheet membranes
These sheet membrane systems are designed to create a continuous barrier against groundwater and hydrostatic pressure. Our team understands the detailing required around joints, penetrations, construction seams, and service entries, all critical points where failures commonly occur if not installed correctly.
Where Below Ground Tanking Is Used
Below ground tanking is predominantly used in:
Basements
Retaining walls
Foundations and footings
Lift pits
Tunnels
Below ground service areas
The methodology is similar to other sheet membrane waterproofing systems, but with added consideration for soil conditions, water tables, and structural design requirements.
Why Specialist Installation Matters
Waterproofing below ground structures is not an area for shortcuts. A failure beneath concrete or backfill can result in costly remediation, structural damage, and ongoing moisture issues.
Your Benefits:
Experienced, trained applicators
Correct product selection for site conditions
Installation in accordance with manufacturer specifications
Detailed workmanship at critical junctions and penetrations
A solution tailored to your commercial or residential new build
We work closely with builders, engineers, and project managers to ensure the waterproofing system integrates seamlessly into the overall construction programme.
If you are planning a new build or require specialist below ground waterproofing advice, our team can provide a technically sound and reliable solution that protects your structure long term.
Get In Touch With Our Team
As a client, you will be satisfied knowing your project will be led and completed by a qualified and certified team. Our team include Project Managers and Quantity Surveyors who bring international experience to offer solutions for you.