Old Georgian glazing would comprise of lots of small, 4mm glass pains, divided up with beautifully thin (18-25mm) solid glazing bars, which would be mortise and tenoned into the frame or sash. Because these pains are so small and light, they would only require a small rebate to house and seal the pains, thus being the reason why such fine glazing lines could be achieved.
The Victorian era developed ‘plate glass’ which was much stronger and could be made in larger pains. This is why it is very typical to see Victorian windows with one vertical glazing bar running through the centre of the window, still maintaining these thin bars.
When double glazing was invented, it became very desirable for wooden windows and doors. A double glazed unit has a ‘warm edge spacer bar’ running round the edge of the unit which bonds and seals the pains together. Because of this and along side increased thickness and weight of the units, these thin and elegant glazing bars could not accommodate double glazing. Instead, early double glazing (which required glazing bars for aesthetic reasons) would adapt the same method, only with an increased bar thickness (often 45mm). This method looks unsightly and completely non traditional in appearance.
We can now get double glazing which can be broken up into, effectively, numerous pains with back to back spacer bars. These spacer bars are set between the two pains. With the addition of strong, modern glazing tapes we can now apply thin bars to the glass face, aligning them up with the spacer bars to give the appearance of individual pains. This method allows a modern window or door to maintain the aesthetic character of Georgian or Victorian glazing, but with increased thermal values and security. This method is also more cost effective.
Slimline double glazing, textured, decorative and hand drawn glass is also available on request to suit customers requirements.