Glass thickness for a balustrade is not a style choice. A 12 mm panel that looks solid on a short pool fence bay can be the wrong call on a wide stair flight or an exposed deck. Thickness works with the glass type, the fixing method and the distance between supports. Change one of those and the right panel can change with it.
Homeowners and installers in Sydney often ask Glass & Fencing Warehouse for a single number. There isn’t one that fits every job. What you can do is collect the measurements that let a supplier or engineer recommend a panel, then order custom glass once that recommendation is in writing.
What actually sets glass thickness for a balustrade
- The span between spigots, posts or channel supports.
- Whether the top edge is uncaptured, has a handrail, or sits in a channel.
- The fall height and whether people can crowd the barrier.
- Wind exposure, especially on coastal or elevated Sydney sites.
- Glass type: toughened, laminated, or toughened laminated.
- Point loads from gates, interlinkers and handrail brackets.
Pool fence panels and balustrade panels are related products, not identical ones. A pool barrier is there to restrict children. A balustrade is there to stop a fall. Some projects need both.
Toughened, laminated and why the label matters
Toughened safety glass is heat-treated so it is stronger in bending and, if it breaks, dices into small pieces. Laminated glass holds a plastic interlayer so the sheet tends to stay in place after a break. Many balustrades use toughened laminated glass where the consequence of a fall is serious. A pool fence is more often toughened monolithic glass, provided the barrier still meets the standard that applies to that pool.
Australian-certified products should be specified by name, not by “the usual thickness”. If a drawing says 12 mm and the fixing layout was designed for 15 mm, follow the drawing or get it revised. Do not split the difference on site.
Panel sizes and custom glass
Glass panel sizes follow the opening, the minimum barrier height and the support layout. Taller panels are not automatically thicker, and wider panels are not automatically safe if the spigots are too far apart. Custom glass pool fence panels are cut to the measured bay. Stock sheets that are trimmed on site are a poor substitute and can void the way the glass was certified.
When you measure, record finished floor level, the coping, any fall across the bay, and obstacles such as a raised spa wall. Those notes decide whether you need a raked panel. Glass & Fencing Warehouse in Sydney can review a schedule through the quote request form if you include those levels.
Fixings change the answer
Spigots clamp the bottom edge. A channel supports it continuously. A semi-frameless system shares load with posts. Each layout has its own span limits. Looking at frameless glass balustrades and glass balustrades in Sydney will show the visual difference. The structural difference belongs in the product data or an engineer’s note, not in a showroom photo.
Hardware must suit the thickness you order. A spigot gasket made for 12 mm will not hold 15 mm, and the reverse leaves a loose panel. Order glass and hardware together so the two match.
Pool barriers are a separate check
If the glass is also the pool fence, height, gaps, gates and climbability still apply. Thickness does not replace those rules. The NSW pool owner obligations page sets out the public requirements, including child-resistant barriers. Installers should also keep pool compliance certificate steps in mind so a thick panel is not installed on a non-compliant gate.
For a pool-only run, compare frameless and semi-frameless glass pool fencing before you lock thickness. Semi-frameless posts change how the glass is held, which changes the panel design.
A simple order checklist
- Mark each bay: pool barrier, balustrade, or both.
- Note span, height, glass type and fixing.
- Attach any engineer or certifier note.
- Confirm gate glass separately from infill panels.
- Ask the warehouse to confirm the hardware suits that thickness.
Call (02) 9627 9500 or contact the warehouse if a drawing and a quote are using different millimetres. It is cheaper to pause the cut than to remake a stair flight.
Conclusion
The right glass thickness for a balustrade is the one that matches the span, the fixing and the fall, using the glass type the design calls for. Custom panel sizes come after that decision, not before. Send the schedule with levels and fixing type, and Glass & Fencing Warehouse can help you order panels that belong on that job.
Frequently asked questions
Is 12 mm glass always enough for a balustrade?
No. Twelve millimetres is common, not universal. Wider spans, point-fixed glass and higher falls can need a different build-up. Use the specification for that bay.
Can I use pool fence glass on an internal stair?
Only if that glass type and thickness were designed for the stair. A pool panel and a stair balustrade do different jobs.
Does thicker glass mean I can space spigots further apart?
Not by guesswork. Support spacing is part of the system design. Increasing thickness without checking the fixings can still leave a non-compliant barrier.
Who decides the thickness on a custom job?
The designer, engineer or system supplier, based on the layout. The warehouse cuts to that instruction. It should be in writing before glass is made.
What should I send with a quote?
Bay widths, heights, glass type if known, fixing method, gate details and photos of the fall. Finished levels matter as much as the width.
