Performance Membranes Australia

Catch the PMA team at Bowens Expo Building + Innovation
THURSDAY 3RD SEPTEMBER 1pm - 8pm

We're at Stand 93, Melbourne Exhibition Building, with the full Pro Clima range on display including Solitex Extasana.

Come talk building envelopes, cavity closers, and how to stop leaky building syndrome before it starts.

Free entry, giveaways all weekend, and we'll be right in the thick of it.

Who's coming through? Drop a comment and we'll say g'day.🤘🏼

Bowens

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.

Repost: 💡

💡Your new home is sealed tighter than any your grandparents built but the code that seals it also makes the wall stay open to water vapour, so the moisture your family makes can dry outward instead of condensing inside the wall. Sealed against draughts, open to vapour.

Our Pro Clima external WRB system is the control layer that is compliant to the code requirements. For any further information, reach out via membranes.build.

PROJECT PMA

Episode 3: Sealing the Window Frame

A continuous moisture barrier around a window frame comes down to two things: tape width and corner technique.

Two widths are used here, 200mm to the outside and 150mm to the inside, with a split release paper that makes clean installation easier on site. Coverage starts with a 50mm overlap, extending 150mm upward, then a press tool works the membrane firmly into the corners before the tape is stuck to the front of the frame and
stretched around.

Corners are where this detail is won or lost. Stretching the tape into the corner is the easiest way to create a future leak, so instead it's carefully worked around the corner rather than pulled tight across it.

Condensation behind a finished material like copper is inevitable, not a defect. What matters is whether the assembly gives that moisture somewhere to go.

Correct tape width, overlap and corner technique are what keep that drainage path open.

How do you get a GAF shingle roof system to BAL-40 without losing ventilation?

We took our standard Wall-Top Cavity Closer to Bowen's Rethink Building Hub in Hastings and added it into GAF's code-marked shingle display to find out.

The closer sits at the wall-to-fascia junction, closing the gap between the fascia and the first course of shingles. GAF's drip edge flashing and membrane layer over the top, while the closer keeps the cavity ventilated underneath the ply, all the way through to the ridge.

The result: a bushfire-compliant detail that doesn't compromise on airflow.

It's a good example of what the profile is built for, standard sizing, adaptable detailing, across different building envelope systems.



Full specs and install guidance: www.cavitycloser.com.au

Right product. Right training. Right result.

Bowens offers training to ensure correct technique for installing pro clima wall membranes and flashing tape - the small details that determine whether a build is truly airtight.

Backing our trade partners with real product knowledge and hands-on training is how we help you build it right, every time.