Arc External Corner 120mm

The Arc External Corner 120mm is a pre-formed waterproof corner piece from the Bostik Arc tanking system, used to seal outside corners in showers, wet rooms and baths.

When you tank a shower or wet room, the flat areas are covered with a liquid membrane, but the joints and corners are where leaks usually start. An external corner is a corner that points out into the room, such as the edge of a boxed-in pipe, a shower niche or a stud wall ending at a shower. Cutting and folding a flat tape around these corners leaves creases and gaps. This pre-formed piece is already shaped to fit, so it gives a continuous waterproof seal with no folds.

It's made from three layers, with a fleece on both sides. The fleece lets the corner bond into the tanking membrane and gives tile adhesive a good key, while the core is 100% waterproof and highly flexible, so it can take the small movements that happen at corners without cracking.

Use it for:

• Outside corners on boxed-in pipework and stud walls
• Shower niches and recessed shelves
• Half-height walls and the ends of walk-in shower walls
• Bath panels and tiled bath surrounds that turn a corner

How it's fitted. Apply a first coat of tanking liquid to the corner area, press the corner piece into the wet coat, and then apply the second coat over it so it's fully embedded. Overlap it with the Arc sealing tape on the adjoining joints so the whole area forms one sealed system. Always follow the full Arc tanking instructions.

Specifications: external corner, 120mm, light grey, 3-layer construction with fleece on both sides, waterproof and flexible. Part of the Arc (Bostik) tanking system.

Planning a wet room or shower? Contact our team for help choosing the full Arc tanking kit, tapes and corners for your project.