Arc Internal Corner 120mm

The Arc Internal Corner 120mm provides a 100% waterproof, pre-formed flexible seal to protect wet room and shower corners from leaks.

When tanking a bathroom or wet room, internal wall-to-floor corners are the absolute most vulnerable points for water damage. The Arc Internal Corner 120mm eliminates the guesswork and stress of folding messy liquid membranes or flat tapes into tight angles. Pre-formed into a seamless 90-degree cornerpiece, this essential tanking accessory gives you guaranteed, professional-grade leak protection right where your shower needs it most.

Engineered with three high-performance material layers, this corner piece is built to handle constant water exposure without breaking down. The inner core acts as a total, impenetrable water barrier, while the outer fleece layers lock directly into your tile adhesive or liquid tanking membrane. This advanced 3-layer construction ensures a bond so strong that moisture simply cannot penetrate through to your timber studs, floorboards, or plasterboard beneath.

Houses naturally expand, contract, and settle over time, which causes rigid sealants or poorly installed tapes to tear at wall joints. Because the Arc Internal Corner is 100% waterproof and highly flexible, it stretches and shifts alongside your building's natural movement without cracking or tearing. It maintains a permanently watertight seal behind your tiles, giving you complete peace of mind against hidden leaks, mold growth, and costly structural repairs down the line.

Instead of cutting, slitting, and overlapping flat waterproofing tape into awkward corners, you simply embed this flexible 120mm piece directly into a wet bed of tanking membrane or flexible tile adhesive. It lays flat without bunching up, ensuring your finished tile layout stays smooth, level, and completely square.

Don't risk water damage behind your new bathroom tiles. Order your tanking corners online today to complete your waterproofing kit, or buy now to ensure your wet room is built to last a lifetime!