Mapei Mapeguard ST Waterproofing Sealing Tape – 10m x 120mm

Mapeguard ST is a high-performance, three-layer waterproofing sealing tape designed to create a continuous watertight barrier at the most vulnerable points in a wet area installation. Used in combination with Mapeguard WP 200 waterproofing and decoupling membrane, this tape reliably seals angles, junctions and overlaps on walls and floors, helping to protect substrates from water damage and movement-related cracking in bathrooms, wet rooms, showers and other damp environments.

Supplied in convenient 10m x 120mm rolls and manufactured from a robust polypropylene / polyethylene composite, Mapeguard ST offers excellent tensile strength, crack-bridging capability and long-term resistance to alkaline tile adhesives and screeds.

Key Features & Benefits

• Fully waterproof: Creates a continuous, watertight seal at joints, corners and changes of plane when used with Mapeguard WP 200.
• 3-layer construction: Made from a multi-layer polypropylene / polyethylene composite for durability and tear resistance.
• High vapour density: Contributes to effective vapour management in wet and humid environments.
• Crack-bridging performance: Accommodates minor movement in the substrate without compromising the waterproofing layer.
• Alkali-resistant: Designed to perform in contact with cement-based adhesives, screeds and renders.
• Excellent bonding: High bond strength to compatible tile adhesives and Mapeguard WP Adhesive.
• Flexible and easy to handle: Simple to cut, position and embed around internal and external corners, wall-to-floor junctions and overlaps.
• Non-rotting: Non-degradable materials ensure long-lasting performance behind the tiling system.

Typical Applications

Mapeguard ST is intended for use as part of the Mapeguard WP waterproofing system in a wide range of internal wet and damp areas, including:

• Domestic and commercial bathrooms and shower rooms
• Walk-in and level-access wet rooms
• En-suite and hotel bathrooms
• Utility rooms and laundry areas
• Other areas subject to intermittent or continuous water exposure before tiling

Typical sealing points include:

• Junctions between sheets of Mapeguard WP 200 membrane
• Wall-to-floor junctions
• Internal and external corners (with dedicated corner pieces where used)
• Transitions, cracks and localised damage in the substrate when included within the system

Technical Information

Note: The above values are typical and for guidance only. Always follow the latest manufacturer technical data sheet and local regulations.

Frequently Asked Questions

Is Mapeguard ST suitable for both walls and floors?

Yes. Mapeguard ST is designed for sealing junctions on both walls and floors when used as part of the Mapeguard WP waterproofing system.

Can this tape be used in a walk-in shower or wet room?

Mapeguard ST is ideal for use in walk-in showers and wet rooms where a continuous, secure waterproofing layer is required beneath the tiles. It must always be installed in conjunction with the appropriate Mapeguard membrane and adhesives.

Do I need special tools to install Mapeguard ST?

No specialist tools are required. A sharp knife or scissors for cutting, and a suitable trowel, taping knife or roller to embed the tape into the adhesive are typically sufficient.

Can Mapeguard ST help bridge small cracks in the substrate?

When used as part of the complete Mapeguard WP system, the tape contributes to crack-bridging performance, helping to accommodate minor movements without compromising waterproofing.