Waterproofing membrane CERESIT CL51 single-component 5 kg

CERESIT CL51 single-component waterproofing membrane in a 5 kg pack creates a continuous, joint-free waterproof barrier under ceramic coverings in wet and damp indoor areas such as private bathrooms, toilets and kitchens. It is formulated for application directly onto a load-distributing layer (screed material) when floors are constructed with insulating layers and is also suitable for use on heated screed substrates.

Advantages

The single-component composition simplifies preparation and application while providing a flexible, water-resistant membrane that quickly dries and can bridge cracks. Approved for use by the A1 building supervision authority, CERESIT CL51 adheres to common building substrates and can be applied on both walls and floors. Packaged in a 5 kg container for manageable handling.

Suitable for

• Wet and damp indoor zones (bathrooms, toilets, kitchens)
• Application under ceramic tiles
• Screed substrates, including heated screeds
• Wall and floor waterproofing

Key specifications

• Product: CERESIT CL51 single-component waterproofing membrane
• Pack size: 5 kg
• Approvals: A1 building supervision authority approval
• Application areas: walls and floors in indoor wet zones
• Properties: water-resistant, fast-drying, crack-bridging

How to use

Surface must be clean, dry and free of dust, grease and loose particles. Mix or stir the product as recommended by the manufacturer and apply evenly with a brush or roller to form a continuous film. Apply on screed or substrate according to substrate manufacturer’s instructions; when used on floors with insulating layers, apply directly onto the load-distributing layer. Allow drying between coats if multiple layers are required; follow manufacturer guidelines for drying times and recommended layer thickness.

Usage recommendations

Use CERESIT CL51 with complementary tile adhesives and sealing accessories from the same system for durable results. Ensure correct substrate preparation and respect recommended curing times; avoid application at temperatures outside the manufacturer’s specified range.