Sovereign Hey'Di K11 Tanking Compound

Salt-Resistant Cementitious Waterproofing Slurry for Positive & Negative Pressure Applications

Sovereign Hey'Di K11 is a high-performance, cementitious tanking compound designed to protect structures against water ingress and hydrostatic pressure. Suitable for both internal (negative side) and external (positive side) applications, K11 forms a durable, waterproof barrier on concrete, brick, and masonry substrates without the need for additional support structures.

Key Features & Benefits

• Dual-Side Application: Effective on both positive and negative pressure sides of structures.
• High Water Resistance: Withstands over 10 bars of hydrostatic pressure with a 4mm coating in two layers.
• Salt Resistance: Prevents the movement of hygroscopic salts; ideal for salt-contaminated walls.
• Potable Water Safe: Certified for use in contact with drinking water, suitable for water-retaining structures.
• BBA Certified: Covered by British Board of Agrément Certificate 91/2608.

Product Specifications

• Form: Dry powder
• Colours: Grey (mandatory first coat), White (optional second coat)
• Pack Size: 25 kg
• Coverage:
  • Below Ground: approx. 4 kg/m² (two coats)
  • Above Ground: approx. 2 kg/m² (one coat)
• Shelf Life: 12 months unopened in dry conditions

Application Guidelines

1. Ensure substrates are clean, sound, and pre-wetted with clean water.
2. Mix powder with Sovereign SBR Bonding Agent diluted 2:1 with water to create a smooth slurry.
3. Apply the first coat (Grey) at a minimum of 2mm using a block brush.
4. After approx. 4 hours, apply the second coat (Grey or White) at similar thickness.
5. Protect the coating from drying too quickly and allow to cure for at least 24 hours before additional finishes.

Application Notes & Best Practices

• Recommended Tools:

  What You'll Need

  • Block Brush or Masonry Brush: For even, heavy-duty application of slurry across concrete and masonry surfaces.
  • Paddle Mixer (Drill Attachment): Ensures a smooth, lump-free slurry mix for consistent performance.
  • Mixing Bucket (Clean Plastic): Use a minimum 20 L bucket to avoid spillage and ensure full mix activation.
  • Protective Gear: Gloves, goggles, dust mask, and coveralls to prevent skin and eye contact with alkaline cement-based material.
• Environmental Conditions: Apply only when ambient and substrate temperatures are between +5 °C and +30 °C. Protect from frost, direct sunlight, and strong wind during and after application. Do not apply to frozen or excessively hot surfaces.
• Curing Times: Allow at least 24–48 hours before exposing treated surfaces to light foot traffic. Wait 3–5 days before applying render, plaster, or tile adhesives. Full curing typically occurs after 7 days under standard site conditions (20 °C, 65% RH).
• Aftercare: Protect newly applied coatings from mechanical damage and excessive drying. If rapid drying is likely, lightly mist with clean water or cover with damp hessian for 24 hours.

Typical Applications

• Basements and cellars – waterproofing walls and floors
• Water-retaining structures – fishponds, tanks, bunds
• Salt-contaminated walls – chimney breasts, barns
• Swimming pools – pre-tile waterproofing
• Lift pits and inspection chambers – below-ground waterproofing
• Alternative damp proof course – where physical DPC is impractical

Ancillary Products

• Sovereign Hey'Di Barrier Mortar: For watertight fillets at wall/floor junctions
• Sovereign Hey'Di Powder X: For halting active water leaks
• Sovereign SBR Bonding Agent: Improves adhesion and elasticity of K11
• Sovereign Renderlite Renovating Plaster: Breathable finish post-tanking

Usage & Safety

• Contains cement—may cause skin irritation, serious eye damage, or respiratory irritation.
• Always wear gloves, goggles, and dust protection when mixing or applying.
• Ensure good ventilation during use.
• In case of contact with eyes or skin, rinse immediately with clean water and seek medical advice if needed.

For comprehensive safety and handling guidelines, download the safety data sheet.

Comparison Table