Factory-Applied Heritage Glazing Bars
Heritage Steel-Look, Georgian & Duplex Glazing Bar Units for Trade Installers
At Crystal Units, we manufacture factory-applied heritage glazing bars designed specifically for professional glaziers and window installers.
Our heritage glazing bar systems are manufactured in a controlled factory environment, meaning your insulated glass units (IGUs) arrive precisely aligned and ready to install to achieve a heritage steel-look appearance.
- No site assembly.
- No inconsistent sightlines.
- No avoidable call-backs.
- Adhesion Warranty
Heritage Glazing Bars – Bridging Traditional Design and Modern Performance
Historically, glazing bars (also known as muntins or astragal bars) were structural components used to hold individual panes of glass together. Before modern float glass production, windows were constructed from multiple smaller “lights” joined by timber or lead bars.
Today, large insulated glass units have removed the need for structural bars. However, heritage architecture — particularly Georgian, Victorian and conservation properties — still demands the classic multi-pane aesthetic.
Crystal Units delivers that traditional appearance using modern, high-performance IGU glazing bar systems that meet current energy efficiency standards.
Applied bars are an effective way to recreate the slim, heritage steel look on modern insulated glass. Used on a single sealed IGU, they give the appearance of traditional divided panes while retaining the thermal efficiency of modern double or triple glazing. Manufactured from durable materials and securely bonded in controlled conditions, they are designed to withstand weather exposure while providing long-term reliability.
Why Choose Factory-Applied Glazing Bars?
For glaziers and installers, a factory application provides measurable advantages:
Our Heritage Glazing Bar Systems
Crystal Units manufactures a complete range of heritage and conservation glazing bar solutions, including:
- External Astragal Glazing Bar Units
External glazing bars are decorative plant-on bars applied directly to the surface of an insulated glass unit, delivering a heritage steel-look appearance while maintaining the thermal efficiency of modern double or triple glazing.
- Georgian Glazing Bar Units
Internal Georgian bar systems fitted within the cavity of the insulated glass unit, creating traditional pane divisions within a clean sealed unit.
- Duplex Glazing Bar Systems
Internal duplex bar systems within the cavity of the insulated glass unit, used to add depth and authenticity to heritage-style glazing with external glazing bars applied.
- Leaded Glazing Units
Leaded glass options designed to replicate historic window patterns while retaining modern thermal performance.
All systems are manufactured to your specified dimensions, layouts and finishes.
Ideal for:
- Listed building window replacements
- Conservation area projects
- Period-style new builds
- Heritage commercial refurbishments
- Suitable across a range of heritage and contemporary glazing projects.
Our glazing bar units are compatible with modern insulated glass constructions, including high-performance options such as low-E coatings and advanced thermal technologies.
| Bar Type | Inside | Outside | Both Sides | Usage Context |
|---|---|---|---|---|
YesDecorative Grid |
No |
No |
Internal cavity bar system manufactured within the insulated glass unit. | |
SpacerDetail |
YesApplied Bar |
Yes |
Ideal for heritage and conservation glazing projects requiring authentic detailing. | |
YesInternal Bar |
No |
No |
Internal cavity bar system manufactured by the IGU fabricator. | |
Optional |
YesLead Strip |
Optional |
Suited to period properties, feature doors and stained-glass style effects. | |
No |
YesPlant-On Bar |
No |
Decorative external bars for clean, modern luxury glazing styles. |
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.
