Structural Waterproofing
Structural waterproofing is the process of waterproofing internal or external buildings using waterproofing membranes.
At CARLISLE®, we have a variety of structural waterproofing solutions to meet your waterproofing needs. Add roofing products straight to your project specification or get in touch below.
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Structural Waterproofing Solutions
Our systems include integral protection and cavity drain methods for internal structures, such as basement car parks.
They also support external uses, including ponds and balconies. Explore the structural waterproofing solutions available from CARLISLE®.
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Types of Structural Waterproofing
Understanding the types of waterproofing available is essential to specifying the right system. BS 8102:2022 sets out three categories of structural waterproofing, each relying on different methods and materials to keep water out.
Type A — Barrier Protection
The most widely specified approach. A continuous waterproofing membrane is applied to the internal or external face of the structure to form a physical barrier.
CARLISLE® offers multiple options in this category. These include EPDM synthetic rubber, cold-applied liquid polyurethane (PU), and TPO single-ply sheet. Each option fits different uses and budgets.
Type B — Structurally Integral Protection
With Type B integral protection, water resistance is built into the structural concrete. This is done using admixtures or a carefully controlled mix design. Primarily used for new below-ground structures and earth-retaining walls, Type B integral protection is rarely sufficient on its own. Most effective when combined with Type A or Type C drained protection.
Type C — Drained Cavity Protection
Instead of preventing water ingress, Type C systems are designed to manage and control it. A dimple-profile cavity drain membrane creates a drainage gap at the internal face of the structure, directing any water that enters to a sump pump for removal. This is the preferred structural waterproofing solution for retrofit basements where external excavation is not possible.
Why Choose Structural Waterproofing?
Structural waterproofing is a long-term investment in a building's integrity, and getting the specification right from the outset avoids costly remedial works later. CARLISLE® waterproofing systems offer:
Life expectancy of 50+ years — our membranes are certified to outlast multiple refurbishment cycles
BS 8102:2022 compliance — all systems and installation guidance align with the current British Standard
Sustainability credentials — from HERTALAN®'s recyclability to SURE-WELD® TPO's solar-reflective surface
Expert technical support — from system selection through to post-installation inspection
Structural Waterproofing Brands
CARLISLE® offers a comprehensive range of waterproofing products for structural applications. They are used for ground-level damp proofing and for protecting below-ground structures from water. Our systems include solutions for basement waterproofing, podium decks, balconies and flat roofs.
Installing Waterproofing Membranes
Installation methods for each type of waterproofing membrane naturally vary. Watch our step-by-step installation guides for two of our leading structural waterproofing systems below. These videos help contractors, specifiers, and architects understand the right waterproofing methods for each system. They support full compliance with BS 8102:2022 and best-practice ground structural waterproofing.
RESITRIX® Structural Waterproofing Installation
Learn how to install RESITRIX®, our hybrid EPDM waterproofing membrane, with this detailed installation guide. This video covers best practices for achieving a seamless, water-tight finish to prevent water ingress on flat roof applications.
ARBOFLEX® PU Cold Applied Liquid Waterproofing Installation
Watch our ARBOFLEX® PU installation video to see how this cold-applied liquid waterproofing system is applied. Its fast, easy application and seamless finish make it one of the most effective structural waterproofing systems available.
For any further information, visit our service portal or contact our team via this contact form.
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