Replacement Duplex-Bar Sealed Units Replicating Traditional Single-Pane Windows – Kingston, Surrey
What glazing work was carried out on this project?
This project involved the replacement of existing glazing with modern insulated glass units (IGUs) designed to replicate the appearance of traditional single-pane windows. The new units were manufactured as duplex-bar sealed units, combining heritage aesthetics with modern thermal and safety performance.
What is a duplex-bar sealed unit?
A duplex-bar sealed unit is a single double-glazed unit that incorporates:
Internal spacer (duplex) bars positioned within the cavity
Externally applied glazing bars and beading fixed to the face of the glass
Together, these elements create the visual effect of multiple individual panes while remaining one sealed, high-performance unit.
Why use duplex bars instead of true divided panes?
True divided light glazing uses separate panes of glass, which significantly reduces thermal efficiency and increases maintenance. Duplex-bar sealed units provide the same traditional appearance while delivering modern insulation, improved durability, and compliance with current building regulations.
What type of glass was used in the sealed units?
The units were manufactured using toughened safety glass, providing enhanced strength and impact resistance. Toughened glass is essential for doors and low-level glazing, ensuring the installation is safe, robust, and suitable for everyday residential use.
Are the units double glazed?
Yes. Each unit is a double-glazed sealed unit, offering significantly improved thermal performance compared to older single-glazed or failed units.
What gas fill was used inside the sealed unit?
The sealed units are argon gas filled. Argon gas improves insulation by reducing heat transfer between the glass panes, helping to maintain internal comfort and reduce heat loss.
What is soft-coat glass and why was it specified?
A soft-coat low-emissivity (low-E) coating was applied to the internal face of the glass. This coating reflects heat back into the property while allowing natural daylight to pass through, improving energy efficiency without affecting visual clarity.
How do the applied bars and beading improve the appearance?
The externally applied glazing bars and beading are precisely aligned with the internal duplex bars. This alignment creates depth, shadow lines, and visual authenticity, making the sealed unit appear indistinguishable from traditional single-pane glazing once installed.
Does this system maintain the original character of the property?
Yes. Duplex-bar sealed units are ideal for period properties and heritage-style homes, as they preserve the traditional window appearance while discreetly upgrading performance behind the scenes.
Is this type of glazing suitable for replacement projects?
Absolutely. Duplex-bar sealed units are commonly used in replacement glazing projects where retaining the original aesthetic is essential, but improved thermal performance, safety, and longevity are required.
What are the key benefits of this glazing system?
Traditional single-pane appearance
Modern double-glazed performance
Toughened safety glass
Argon gas insulation
Soft-coat low-E thermal efficiency
Reduced maintenance compared to true divided panes
Where was this installation carried out?
This replacement glazing installation was completed at a private residential property in Kingston, Surrey, delivering a refined, period-correct finish with modern glazing performance.