A polycarbonate balcony glazing panel is a safety component that happens to look like a window, so the specification order runs backwards: impact and restraint first, appearance second.
A housing developer in Melbourne replaced 60 balcony infills that had been installed in 4 mm twin-wall. Two panels had failed the guard load test, and the whole batch was rejected before handover.
Polycarbonate balcony glazing panel and guard height
- Guard height to the top rail: 1100 mm minimum, many codes
- Infill: 8 mm solid, 10 to 12 mm on wide bays
- Post spacing: from the tested system, not guessed
- Top rail: continuous, gasketed, drainage holes
The guard height belongs to the rail, not the panel. A panel that stops at 900 mm with the rail above it is still a 1100 mm guard; a panel that reaches 1100 mm with no rail is a sheet that people lean on at its weakest point.
Rattle, tint and the cleaning question
Rattle comes from clearance. A panel floating in a channel will slap in gusty weather until the edge frets and cracks. A compliant gasket with 1 mm clearance holds it, allows thermal movement and stops the noise.
Tint is a practical choice on a city balcony. A light bronze at 8 mm hides the view of the car park next door while keeping 70 percent light transmission, and it also cuts the solar load on the panel, which extends service life in strong sun.
Cleaning on a balcony runs into the same trap as any polycarbonate: ammonia and alcohol attack the surface, and abrasive cloths haze it permanently. For the regime that keeps a panel clear, see polycarbonate scratch resistance.
For the guard system this panel sits in, the structural logic is set out in polycarbonate balustrades.
Send your balcony opening sizes, rail detail and wind exposure to oversales@rpplexiglass.com for a glazing quotation.
Frequently Asked Questions
What thickness polycarbonate balcony glazing?
8 mm solid for infill panels to 1200 mm high, 10 to 12 mm where the panel spans more than 1 m between posts or takes full wind load. Thin multiwall is not a guard and should not be substituted.
Is polycarbonate allowed for balcony guards?
In many jurisdictions yes, provided the panel is a solid grade with a documented impact performance and is fixed with posts at a tested spacing. Twin-wall sheet is generally not accepted because it is not a structural panel.
Why does a balcony panel rattle in wind?
The panel is held loosely between rails. A 3 mm gap at the top rail lets the sheet flex and slap; a compliant gasket plus a 1 mm clearance holds it without introducing stress.