Toptank Tanking Slurry - 25kg - Biokil Crown

£82.80

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Biokil Crown Toptank Tanking Slurry is a BBA-approved, two-part cementitious waterproofing system for internal masonry and concrete. Ideal for basements, cellars, and retaining walls, it forms a dense, watertight barrier that resists positive and negative water pressure. Easy to apply by brush or trowel, providing reliable long-term waterproofing protection.

Size

25Kg

Colour: Grey

Product variants

Delivery and Shipping

Place your order before 3pm for next working day delivery.

Please note: Additional delivery charges may apply for Northern Ireland, Isle of Wight, Isle of Man, Isles of Scilly, Scottish Highlands & Islands, and Channel Islands. We will contact you to inform you of any additional costs once your order is received, or you can call us on 0800 111 4898 beforehand to confirm.

Description

BBA‑Approved Two‑Part Cementitious Waterproofing for Internal Walls & Floors

Biokil Crown Toptank Tanking Slurry is a BBA-approved, two-component cementitious membrane system for internal masonry and concrete waterproofing. Ideal for tanking basements, cellars, lift pits, retaining walls and internal foundations, this system can be brush-, trowel- or spray-applied and delivers high-performance resistance to both positive and negative water pressure. It forms a dense waterproof barrier while remaining vapour permeable—ensuring long-term protection and building compliance.

Key Features & Benefits

BBA-Certified Performance: Trusted for waterproofing quality and compliance in UK standards.
Dual Water Pressure Resistance: Suitable for positive (hydrostatic from outside) and negative (internal) pressure.
Two-Part System: Includes powder and liquid component for consistent, bonded application.
Excellent Adhesion: Bonds directly to masonry, concrete, blockwork—no primer needed.
Water Vapour Permeable: Allows moisture escape to prevent damp build-up behind coating.

Product Details

Pack Size: 25 kg tub (powder mixed with liquid on-site)
Coverage: Approximately 8 m² per 25 kg pack (depending on surface porosity and coat thickness)
Colour: Grey
Application Methods: Brush, trowel, or spray
Certification: BBA-approved under certificate 17/5444

Application Instructions

Ensure substrate is clean, stable, and free from oils, dust, laitance; pre-wet before application.
Mix powder into the liquid gradually while stirring until a smooth, lump-free slurry is achieved.
Apply first coat evenly using a stiff brush or trowel.
Wait 6–8 hours (subject to ambient conditions), then apply a perpendicular second coat.
Protect from frost and rapid drying; allow 24–48 hours curing before backfilling or overcoating.

Limitations

Do not apply below 5 °C or to frozen/saturated surfaces.
Not intended for final floor finish—must be overcoated or covered.
Not suitable for active standing water without drainage provision.

Health & Safety

Wear suitable gloves, dust mask, eye protection during mixing and application.
Avoid skin or eye contact; rinse thoroughly if contact occurs and seek medical advice if needed.
Consult the Safety Data Sheet (SDS) provided with each delivery.