Bolted glazing system

The use of sophisticated bolted glazing systems, where glass panels are attached directly to structural steelwork without using any intermediate framing, has grown significantly in recent years. Bolts attach the glass to brackets on the steel through pre-drilled holes in the glass panes. The bolts provide point support instead of the continuous edge support given by conventional frames.

Vertical glazing panels, up to 2 m x 2 m, can generally be supported using four corner fixings, whilst larger panels, up to 2 m x 4 m, typically require 6 fixings. Horizontal and inclined glazing may require more frequent supports.

Various types of bolted fixing have been developed. These include simple bolts, where the head is proud of the surface of the glass, and countersunk designs that are recessed into the glass. Articulated fixings are often used in conjunction with large panes on tall or long span, steel structures. As the glass panels and the supporting structure bend under the combined effects of self weight and applied loads, articulated bolts allow some rotation of the fixing.