Glazing bars can be specified as either true solid bars or applied (astragal) bars, depending on the level of authenticity and performance required. Glazing bars and glazing finishes can be combined in different ways to balance appearance, performance and planning requirements.

In a true bar, each pane sits within its own rebate and is secured individually using traditional putty glazing. In an applied bar, the glass is a single sealed double or triple glazed unit, with matching bars fixed to its internal and external faces to recreate the appearance of divided panes.

Applied bars are typically paired with a duplex spacer bar within the sealed unit itself, recreating the shadow line of the applied bar on the inside face of the glass. Duplex spacers are available in a small range of finishes, including white, light grey, dark grey, black and two brown tones, allowing the internal shadow line to be matched to the applied bar or frame colour.