Toptank Tanking Slurry - 25kg - Biokil Crown

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.