Type A Internal Waterproofing

Reliable Barrier Systems for Internal Basement Waterproofing

Achieve watertight protection from the inside out with our BBA-certified Internal Type A Waterproofing systems, engineered to BS 8102:2022.
This collection features trusted solutions from Newton Waterproofing, Wykamol, Sika, Mapei, Ardex, and Winkler, including liquid-applied membranes, tanking slurries, waterproof mortars, and repair plasters—ideal for retrofit basements and existing structures where external access is not possible.

What Is Internal Type A Waterproofing?

Type A (Barrier Protection) waterproofing creates a continuous internal membrane or coating applied to the inside face of a wall, floor, or structure.
It forms a watertight layer that prevents water ingress through hydrostatic pressure, keeping basements, foundations, and underground spaces permanently dry.
Internal tanking is the preferred solution for existing or heritage buildings, offering a fast and non-invasive waterproofing method without excavation.

System Benefits

• Fully compliant with BS 8102:2022 for below-ground waterproofing.

• Liquid-applied and cementitious coatings provide seamless barrier protection.

• Rapid-curing mortars and slurries minimise downtime and enable quick recoating.

• Compatible with damp proofing and salt control systems for complete wall treatment.

• Easy application by brush, roller, spray, or trowel—ideal for retrofit projects.

Applications

• Existing basements and cellars

• Retaining walls and below-ground structures

• Lift pits, plant rooms, and tunnels

• Heritage and listed buildings where external works are restricted

• Combined use with Type B and Type C systems for multi-layer protection

Leading Internal Type A Systems

• Newton HydroCoat Range – advanced liquid membranes and waterproof mortars.

• Wykamol HydraDry and Tanking Systems – cementitious slurries for internal tanking.

• Sika and Ardex Mortars – high-strength repair and waterproofing mortars for structural concrete.

• Limelite and Wykamol Plasters – moisture-resistant finishes for damp walls and basement environments.

• Hydrotank and Waterplug Products – fast-setting mortars for leak sealing and service penetrations.

For specification or technical advice, contact our experts on 01268 472358.

Why Choose Clever Shield Internal Waterproofing

• Certified systems from Newton, Wykamol, Sika, Mapei, and Winkler

• BS 8102:2022 compliant for internal tanking applications

• Ideal for existing and retrofit basements

• Quick-curing, durable coatings for long-term protection

• Compatible with mesh membranes and renovation plasters

• Rapid UK delivery and exclusive trade pricing

Frequently Asked Questions

What is Internal Type A waterproofing?
It’s an internal barrier system applied to the inner surfaces of below-ground structures to prevent water ingress. Perfect for retrofit or heritage projects where external excavation is not possible.

Is it suitable for old or damp basements?
Yes—cementitious tanking slurries and plasters are specifically designed for retrofit basements and damp environments.

Can these products be used with Cavity Drain Systems?
Absolutely. Internal Type A systems can complement Type C (drainage) systems for combined waterproofing performance.

How are these coatings applied?
They can be applied by brush, roller, spray, or trowel, depending on the surface and product type.

Are the products certified?
Yes—all major systems are BBA-certified and meet BS 8102:2022 design standards.

Do I need to use special plasters or mortars on top?
Use compatible renovation plasters or mortars to prevent salt migration and maintain breathability within the structure.

Related Waterproofing Solutions

• External Type A Waterproofing (New Build)

• Type B Integral Waterproofing

• Type C Cavity Drain Systems

• Damp Proofing & Salt Control

• Primers & Adhesion Promoters

• Mortars & Plasters for Finishing