Glass Partitions

Glass partitioning is what an office looks like when nobody wants to admit they are putting walls back in. It divides the floorplate without closing it, keeps daylight moving through the space, and gives managers offices without making the rest of the floor feel like a corridor.

Urban Shopfronts installs frameless and slim-framed glass partitioning across commercial interiors. The glazing skill is the same one we apply to shopfronts — setting large panes accurately, sealing them properly, and making sure the glass specification actually matches what the building needs.

Frameless, butt-jointed and slim-framed

True frameless partitioning uses toughened glass panes set into a floor channel and head track, joined edge to edge with a clear structural silicone joint and no intermediate post. Visually it is the cleanest option available. It is also the most constrained: acoustic performance is limited by the silicone joint, and panel sizes are governed by what can be manufactured, transported and carried into the building.

Slim-framed systems keep a narrow aluminium section — around 25 mm sightline — between panes. You lose a little of the seamlessness and gain a lot on acoustics, cost and buildability. For most offices this is the right compromise, and it is what we specify unless the brief is explicitly design-led.

Glass specification

All partition glass is toughened safety glass to BS EN 12150, which fractures into blunt granules rather than shards. Where glass sits in a location at particular risk of impact, or where overhead glazing is involved, laminated glass to BS EN 14449 is specified instead, because laminated glass stays in the frame when broken.

Standard thickness is 10 mm or 12 mm toughened for single-glazed partitioning, depending on pane size. Acoustic double-glazed units use two panes of differing thickness — 8 mm and 10 mm, say — because matched panes resonate together and lose performance at exactly the frequencies human speech occupies.

Privacy without losing the light

Manifestation is required by Approved Document M on full-height glazing, and it is also the obvious place to do something considered rather than apply a strip of dots. Frosted vinyl bands, graduated gradients, etched film, and printed graphics all meet the requirement. A gradient band that is opaque at seated eye level and clears above works well for meeting rooms.

Switchable privacy glass — laminated with a liquid crystal interlayer that turns from clear to opaque on a switch — is available where a room needs to be transparent most of the time and private occasionally. It is considerably more expensive than film and needs a power supply to each pane, so it is usually specified for one or two rooms rather than a whole floor.

Acoustics, honestly

Frameless butt-jointed glazing typically achieves around 32 to 36 dB Rw. A slim-framed double-glazed system with proper perimeter seals reaches 45 to 48 dB Rw. Anyone quoting a high figure on frameless single glazing is quoting the glass, not the installed system — the silicone joint between panes is the weak point and there is no practical way around it.

As with any partitioning, the ceiling void matters more than the specification. A 48 dB partition stopping at a suspended ceiling with an open plenum above will perform nothing like its data sheet.

Doors

Glass partition doors are either frameless toughened leaves on patch fittings and floor springs, or framed leaves matching the partition system. Frameless suits the aesthetic and needs careful specification of the closer and the floor preparation for a spring. Framed doors are easier to seal acoustically and easier to fit accessible ironmongery to. Where a door forms part of an accessible route, Approved Document M applies in full.