Glazing bars

Countless combination options

A glazing bar (also called sash bar) is a rigid bar that connects two separate panes of glass. Traditionally, glazing bars were used in sash windows. They enabled the manufacturer to combine smaller, less expensive panes of glass to create large windows. More recently, they tend to be used for aesthetic reasons to give a more traditional appearance and feel to a glass units.

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Glazing bars options

Glazing bars are available in 36mm, 54mm and 115mm to match transoms and mullions. Externally the colour will match the other parts of the sash. The 36mm and 54mm internal profiles are available in grey, white, and black to match the glazing bead whilst the 115mm will match the colour selected for the timber frame. Glazing bars are not available for fire windows and doors.


VELFAC windows and doors are sold exclusively through a UK wide network of professionals distributors selected for their excellent product and technical knowledge. We recommend you to get in contact with a distributor to discuss your glazing bars options.

Description and benefits

Windows glazing bars

Window glazing bars configurations can change your house appearance. You have countless combination options to give a personal touch and a more traditional style to your composite windows and doors.


Glazing bars can add character and style to your VELFAC windows or glazed doors– use vertical or horizontal bars to maintain a uniform pattern formed by mullions or transoms, or to create a Georgian style window divided into smaller panes.


They can also be used to combine two different types of glazing in the same sash, for example in ‘apron’ areas of glazing.

Technical information on glazing bars

Visit our technical database
See our product details, explore opening functions and download drawings, instruction and other documents for the VELFAC windows system.

Go to technical information on glazing bars

See examples of windows and doors with glazing bars

Frequently asked Questions


When you are considering glazing bars, there can be many relevant questions that you want answered. We have gathered some of the frequently asked questions right here.

Why are glazing bars provided on Windows?

Glazing bars partition the glass into a series of smaller glass panes. In the past, more glazing bars and small panes of glass meant more opportunity for insulation problems. Today, glazing bars are used only for aesthetics reasons , and their use doesn't affect the thermal efficiency of a glazing unit.

What are the pros and cons of using glazing bars?

From an aesthetic point of view, some people consider the division of a window or glazed door into multiple panes to be more architecturally attractive than use of large panes. Glazing bars suit well houses built with a traditional style , but of course the use of glazing bars reduces the amount of natural light coming from the glass surface.

Discuss your project with a VELFAC distributor

Tell us about your project by filling a form and we will get you in touch with one of the distributors in your area. VELFAC distributors offer a wide range of services to help you every step on the journey to your new windows and doors.


All glass, colours and accessories

Glazing options
Glass options
Glazing bars
Color options
Handles & restrictors

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Certified & quality tested

All VELFAC products are thoroughly tested and quality assured. VELFAC meet - and exceed - all necessary standards.