Glass-to-Glass Corner Glazing in Padstow Conservation Area

Glass-to-glass structural returns without a corner mullion

Fixed frameless glazing forms the two-storey returns. The panes meet through a structural silicone joint at the internal corner, removing the need for an aluminium mullion and maintaining a continuous view through the junction.

The Invisio perimeter profiles are concealed within the surrounding finishes. With the floor slab and steelwork kept behind the glazed plane, the structural division remains visually secondary and the corner detail is repeated consistently at both levels.

Top-hung ventilation and open-out access clear of the slab

An inward-opening lower-floor door would have conflicted with the slab line. The completed arrangement therefore uses an open-out aluminium casement door with a head-fixed restrictor, paired with a top-hung aluminium window at first-floor level.

Both moving elements sit beside the fixed glass rather than within the corner itself. This provides controlled ventilation and direct access while preserving the glass-to-glass junction as a fixed structural detail.

Technical details

• Fixed frameless structural glazing: thermally broken fixing profile depth 63mm; maximum glass thickness 41.5mm; expected Uw 1.1 W/m²K; minimum fixing setback 55mm; structure deflection allowance 5mm. Used for glass-to-glass internal corner returns at ground and first-floor level.
• Top-hung aluminium casement vent: upper-level top-hung opening selected to provide controlled ventilation without an inward-opening sash crossing the floor-slab line. Final glass build-up and performance specified to suit the surveyed opening and adjacent structural glazing.
• Open-out aluminium casement door: ground-floor outward-opening configuration with a head-fixed restrictor. The opening direction keeps the door clear of the floor slab, with the PPC handle matched to the RAL 7044 Matt framework.
• Project glazing specification: confirmed wind load 800 Pa; maximum recorded glass weight 182kg; marine-grade PPC finish to exposed aluminium profiles; aluminium pressings included at the perimeter junctions.

Cross Street demonstrates how structural glass can be integrated into a conservation-area extension while accommodating a two-storey slab line, opening elements and coastal exposure within one coordinated elevation.

For glass-to-glass corner glazing in Padstow or other architectural glazing projects in the South West, IQ Glass can advise on structural glazing, aluminium openings, marine-grade finishes and building interfaces. Contact IQ Glass to discuss the technical requirements for your project.