Glazing Bars

The black 'hot-melt' border around the double glazed unit has to be hidden. This is done internally by the width of the bar and externally by beading. Colin is using non-setting butyl putty to bed the units and the beading is sealed with clear silicon.

There are two ways of making timber glazing bars in double glazed windows. The method you choose is a matter of taste.

Wide Bars

The picture alongside shows a box sash window with four individual double glazed units being fitted in the top sash.

The picture above shows the sash with the beading in place, As you can see, the bottom sash has no bars and this is not uncommon with this design

The picture above shows double glazed units which have been sub-divided into four. Aluminium spacer bars are clipped back to back between the two pieces of glass. Picture below shows the timber bars in place

Duplex Bars

In order to achieve traditional looking narrow bars we use the 'duplex' system. The picture on the left shows a batch of duplex double-glazed units

The narrow timber glazing bars (duplex bars) seen in the photo above cover the back-to-back spacer bars and are outside the glass both back and front. The rear bars are part of the sash or frame and the front bars are taped with a designed adhesive to the glazing. Paul is quality checking the alignment

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