28/08/2026
PROJECT PMA
Episode 4: Sealing Through Battens and Cladding - Deflect it, Don't collect it
Getting the window sealed is only half the job. The seal has to survive everything that gets fixed on top of it.
150mm and 200mm Tescon Extoseal tape forms an over-flashing across the front and along the strip drain, closing off the top of the assembly before battens go on.
Fixing battens over a sealed area means driving nails and screws straight through it, which is normally where a seal starts to fail.
The tape is designed for exactly this: as the fastener passes through, the adhesive is pulled into the hole and closes around it from the inside, rather than leaving an open pe*******on.
The result is a wall that stays watertight and weathertight after the cladding goes on, not just before it. Water is deflected rather than collected, with drainage paths out through the front, down the ventilated cavity, or through the seal itself.