Hydrophobic, Non-Shrinking Mortar for Waterproofing & Tanking Junctions

A high-performance, cementitious repair mortar formulated to prevent water ingress at critical junctions. Designed for use as part of the Sovereign Hey’Di Tanking System, it creates a durable fillet at wall/wall and wall/floor joints and can also be used for patch repairs. Its hydrophobic properties and high compressive strength ensure long-term waterproofing without shrinkage or cracking.

Key Benefits

• Forms watertight fillets at construction joints in tanking systems
• Hydrophobic & non-shrinking—resists cracking and water penetration
• High compressive strength over 40 N/mm²—suitable for structural repairs
• Extended working time up to 5 hours—ideal for complex prep work
• Excellent adhesion to concrete, stone, brick, and blockwork

Product Details & Coverage

• Form: Powder
• Colour: Grey
• Pack Size: 25 kg bag
• Yield: Approx. 15 L per 25 kg when mixed with water
• Coverage: Approx. 1 kg per linear metre for a 25 mm fillet
• Shelf Life: 12 months in dry, cool, off-ground storage

Application & Mixing Instructions

1. Apply to clean, damp substrates only (avoid surface water).
2. Mix powder with clean water to a firm, workable consistency.
3. Apply 25 mm fillets at junctions immediately after the first coat of Hey'Di K11 has begun to stiffen (approx. 1 hour).
4. Allow mortar to stiffen for 2–3 hours before overcoating with the second coat of K11.
5. Do not apply in temperatures below +5 °C.

Usage & Safety

• Contains cement—may cause skin and eye irritation or burns.
• Wear protective gloves, clothing, and eye protection during use.
• Avoid contact with skin and eyes; rinse immediately with clean water if contact occurs.
• Use only in well-ventilated areas.
• Keep out of reach of children.

For comprehensive health and safety information, refer to the Safety Data Sheet.

Ideal For

• Forming fillets in waterproof tanking systems (Hey’Di K11)
• Basements, cellars, retaining walls, and below-ground structures
• Patching cracks and repairing damp-prone masonry
• Preparation before cementitious waterproof coatings

Comparison Table