Glass balustrades for terraces and balconies

Terraces and balconies are the most visible application for frameless glass balustrades. The guarding must prevent falls, resist weather and wind, and disappear visually so the view remains. Achieving that requires correct height, toughened-laminated glass, a fixing system matched to the slab or deck, and coordination with structure and weathering — not glass alone.

Terraces vs balconies — specification differences

Balcony usually means a projecting platform outside an upper storey — steel, concrete or timber deck with guarding at the open perimeter.

Terrace often describes a flat usable roof area — a roof terrace — with guarding at the roof edge and sometimes around plant or lightwell openings.

For guarding height, both are typically treated as external edges in dwellings — 1100mm glass height is the usual specification unless building control agrees otherwise. The same toughened-laminated panels and fixing options apply; the difference is how the floor is built and how water is managed.

Layouts — straight, L and U runs

Most terrace edges are straight runs along one or more sides. Wrap-around designs use L-shaped or U-shaped configurations with 90° corners. Each side is measured separately; panels are equal width within each leg.

Closed sides that meet a parapet wall need no glass — measure only open edges. Door openings onto the terrace may need a gap or a return panel — show these on a sketch when ordering.

Fixing systems on external platforms

System

Terrace suitability

Base channel

Excellent on concrete with formed recess; cleanest look

Spigots

Good on concrete slab edges; check anchor depth

Posts

Suited to decks, mixed substrates and exposed sites

Channel details sit at the drip edge. Water must fall away from the building; the rebate must not hold standing water against the glass toe. Spigots penetrate the waterproofed slab — coordinate membrane terminations with the roofer. Posts bolt through paving or mount to an edge beam with conventional base plates.

Hardware in brushed steel, polished chrome or matt black should be chosen for external exposure — stainless grades resist tea-staining in coastal air better than mild steel.

Structure and cantilever

Balconies often cantilever from the building. The slab edge carries guard loads (line load at the top of the glass) and wind suction on exposed faces. The structural engineer sizes the slab and reinforcement; the balustrade supplier provides fixing loads.

Do not cast anchor bolts in the wrong position — setting-out drawings from the balustrade manufacturer should reach the formwork team before the pour.

Wind and exposure

On tall buildings or open elevations, wind pressure on a solid glass barrier is significant. Thicker toughened-laminated builds and closer panel centres may be required. Exposed roof terraces may need additional fixings or a continuous handrail for confidence — discuss with the supplier on high-rise or coastal projects.

Weathering interface

The balustrade is not a waterproofing layer. On a roof terrace, the roof membrane and falls must be complete before guarding traps water at the edge. Typical sequence:

1. Structural slab with edge detail for chosen fixings
2. Waterproofing and insulation with falls to outlets
3. Channel or post bases installed and flashed
4. Paving or decking
5. Glass panels and handrail

Skipping steps or trapping membrane under non-drained channels is a common defect path.

Internal balconies and galleries

Not every balustrade is external. Internal galleries and mezzanines overlooking a double-height space use the same made-to-measure panels at often 900mm or 1100mm depending on drop and layout. There is no weathering, but acoustic and cleaning access may matter — frosted glass is an option on bedroom galleries.

Ordering checklist for terraces

1. Measured run length per side and agreed 1100mm (or approved) height
2. Fixing type aligned with structural detail
3. Handrail decision recorded
4. Glass finish — clear, tinted or frosted
5. Building control approval path confirmed
6. Remeasured opening immediately before manufacture

Vant Glass manufactures made-to-measure glass balustrades and Juliet balconies in Britain, with free UK mainland delivery. Browse balustrades and guarding or call 03330 902 592 to discuss your run.