Cementitious Tanking Slurries & Renders – Type A (barrier) Protection

Cementitious tanking slurries and renders form a bonded waterproof barrier to concrete, masonry, and blockwork substrates. When correctly specified, they resist hydrostatic pressure by relying on substrate integrity and detailing quality at joints, penetrations, and interfaces.

Within BS 8102:2022, Type A waterproofing refers to a barrier system applied either to the internal or external face of a structure to resist water ingress. The cement-based products in the HydroCoat System range bond strongly to the internal side of the structure, resisting groundwater pressure attempting to force its way inward and feature rigid, polymer-modified, and crystalline cementitious systems, allowing selection to be aligned with substrate condition, exposure level, construction sequencing, and waterproofing risk.

For externally applied Type A sheet membranes, please visit the HydroBond System page.

What Are Cementitious Tanking Slurries & Renders?

Cementitious tanking systems are applied directly to properly prepared structural substrates. Performance depends on:

• Substrate quality and continuity
• Detailing at construction joints and service penetrations
• Compatibility with applied finishes and protection layers

Cementitious tanking systems are inherently suitable for internal (negative-side) waterproofing. However, performance remains dependent on product selection, groundwater pressure, substrate condition, and detailing quality.

Key Performance Characteristics

Newton formulates its cementitious tanking slurries and renders to deliver specific performance characteristics, depending on application requirements, substrate condition, and exposure conditions.

Depending on the system selected, key characteristics may include:

• Flexibility and crack accommodation to tolerate minor substrate movement
• High compressive strength suitable for structurally demanding environments
• Chemical and abrasion resistance for aggressive or high-wear conditions
• Crystalline waterproofing action that penetrates the concrete matrix, blocking capillaries, micro-cracks & pore networks
• Installers apply renders and screeds as a single, thicker coat. Ideal for substrates too uneven for thin slurry applications.

These characteristics allow designers to align system selection with structural conditions, detailing complexity, and long-term performance requirements.

Application Methods

Depending on product formulation and site conditions, cementitious tanking systems can be applied by:

• Brush
• Roller
• Specialist spray equipment

When correctly specified, installed, and protected, cementitious tanking systems deliver durable, long-term performance consistent with design life expectations.

Available Cementitious Tanking Systems

HydroCoat 103 2K – Low polymer slurry with enhanced chemical resistance
HydroCoat Tanking Slurry –cementitious tanking for concrete and masonry
HydroCoat 104 Super – crystalline waterproofing for concrete structures
HydroCoat 105 1K – single-component cementitious slurry, render, and fairing coat
HydroCoat 107 Elastic 2K – polymer-rich slurry with high flexibility and dynamic crack capability
HydroCoat 1 Render – Single coat, polymer-modified and fibre-reinforced render
HydroCoat 1 Screed – Single coat, self-smoothing, high-performance floor screed

Contact Newton Waterproofing

For technical advice, specifications, and support with cementitious tanking system selection, contact Newton Waterproofing. Our team guides detailing coordination and BS 8102:2022 compliance, ensuring the correct system is selected early in the waterproofing design process.

Speak to our friendly, expert team

Our staff are able to provide guidance for projects of all sizes, whether you require some general advice about damp or waterproofing, or support with technical drawings and specifications.