Heritage Astragal Glazing Bar Units

INNOVATIVE SOLUTIONS

Heritage Astragal Glazing Bar Units for Trade Installers

Astragal Glazing Bar Units are designed to replicate the appearance of traditional true divided light windows, with applied bars and a matching spacer arrangement creating depth and shadow lines associated with period glazing.

Astragal bars no longer serve a structural role — instead, they are a visual enhancement. Mounted on a single large pane of glass, they divide the surface into smaller sections, recreating the charm of historic windows while meeting today’s performance standards. This approach is especially suited to period-style buildings, where authenticity is essential but energy compliance can’t be ignored.

How They Work:

External and Internal Bars: Applied to the outer and inner faces of the IGU.

Duplex Spacer: Installed between the panes to align with the bars, creating a convincing through-glass effect.

Shadow Play: The raised bars cast natural shadows, enhancing visual depth and mimicking original joinery

Key Benefits:

  • Approved in many Conservation Areas
  • Authentic sightlines and light-break effects
  • Compatible with heritage steel-look and aluminium framing systems
  • Suitable for projects with Article 4 directions or where planners demand traditional detailing

Astragal vs Georgian Bars – What’s the Difference? Astragal bars are applied to the glass surface and paired with a matching spacer arrangement to create stronger depth and shadow lines. Georgian bars sit within the cavity of the IGU for a flatter, simpler finish.

Best For: Conservation areas, listed building lookalikes, premium developments, and any project where authentic period aesthetics must align with modern performance.

Astragal Glazing Bar:

Factory-applied glazing bars offer clear advantages for installers and end clients alike. By applying Astragal bars in a controlled manufacturing environment, we ensure precise alignment, secure bonding and a consistent finish across every unit. This reduces installation time on site, minimises the risk of damage or misalignment, and provides long-term durability — all backed by product warranty for added reassurance.

Best For: Conservation areas, listed building lookalikes, premium developments, and any project where authentic period aesthetics must align with modern performance.

Built for Glaziers. Designed for Heritage Projects.

We understand that installation efficiency and finish quality are critical on heritage projects.

If you’re specifying glazing bars for an upcoming project, contact our team early in the process so we can manufacture your insulated glass units ready for installation.

With fast lead times, factory precision and product warranty for added reassurance, we help you deliver heritage aesthetics with modern performance — on time and with confidence.

By choosing factory-applied glazing bars, you benefit from:

  • Reduced installation time
  • Improved visual consistency
  • Lower snagging risk
  • Reliable long-term performance
  • Professional presentation to your client
  • Warranty

Why Should Glazing Companies Choose Crystal Units for Bar Units?

Because we make your installations faster, cleaner and more reliable.

Factory Precision, Every Time

Our glazing bar units are manufactured in a controlled factory environment, ensuring accurate alignment, consistent spacing and secure bonding. No site guesswork. No uneven sightlines.

Faster Installation on Site

Units arrive ready to fit. That means less labour time, fewer adjustments and quicker turnaround on projects.

Reduced Snagging & Call-Backs

Factory-applied bars minimise the risk of misalignment, detachment or cosmetic issues that can occur with site-fitted systems.

Wide Range of Profiles & Finishes

From Georgian and Astragal to Duplex and external stick-on bars, we offer multiple sizes and powder-coated finishes to suit heritage and contemporary requirements.

Thermal Performance Maintained

Our bar systems are integrated within high-performance insulated glass units, preserving energy efficiency while delivering the traditional multi-pane appearance.

Fast Lead Times

We understand project schedules. Our manufacturing capability allows us to offer efficient production and dependable delivery times.

Product Warranty for Peace of Mind

All factory-applied glazing bar units are covered by warranty, giving glazing companies and their clients added reassurance.