One of the most common questions we get from contractors is whether to spec 6 mm or 12 mm tempered glass for a railing. The short answer: it depends on how the glass is held. Here is how to choose.
6 mm — framed / channel systems
6 mm tempered glass is the standard for framed aluminum railing, including Regal and Vista systems. The glass is captured on all sides (or top and bottom) inside an aluminum channel with a vinyl insert, so the frame carries the load and the glass just needs to be strong enough to resist impact. It is the most economical option and the fastest to install.
- Best for: standard deck, balcony and stair guards in a framed system.
- Look: clean, framed edges; available clear, frosted privacy and grey tint.
10 mm — heavier framed applications
10 mm is a step up for larger panels or where you want extra rigidity while still using a channel. It is a middle ground between standard 6 mm framed glass and full frameless.
12 mm — frameless spigot systems
For a frameless look — where the glass is the guard, held only by spigots or standoffs at the base — you need 12 mm tempered glass. Because there is no top rail or side frame carrying the load, the glass itself must meet the structural and deflection requirements, which is why it is thicker (and pre-drilled for the hardware).
- Best for: modern frameless glass railings, top-mount or side-mount spigots.
- Look: uninterrupted glass with minimal hardware — the premium option.
Quick rule of thumb
If there is a frame or channel around the glass, it is almost always 6 mm (occasionally 10 mm). If the glass stands on spigots with no top rail, it is 12 mm. Always confirm against the railing manufacturer's spec and your local code.
Tell us the system and we will confirm the right thickness and size. Get a quote → or shop glass panels.