Does fixing a balustrade through a flat roof membrane void the waterproofing warranty?

In most cases, yes.

Third-party penetrations through a waterproof membrane not sanctioned by the manufacturer typically invalidate the warranty. Approved penetration guidance – where it exists – is written for static service penetrations like pipes and drainage outlets, not for structural balustrade fixings that impose ongoing cyclical loads every time the wind blows.

With BalcoDeck® the question does not arise. The system sits on top of the finished membrane. Nothing penetrates it. The membrane warranty is unaffected by the BalcoDeck® installation – because the installation never touches the membrane.

Every BalcoDeck® installation comes with a Certificate of Compliance covering structural loads, wind loads, fire rating and building regulations compliance. That certificate sits alongside the membrane warranty. Both remain intact.

For the full FAQ – including what approved penetration guidance actually covers, what documentation specifiers should demand, and what the warranty position is with a non-penetrative system – read the complete article here.