Glass Circular Skylight Mullion - GCXLM
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7-Year Warranty
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Glass Circular Skylight Mullion - GCXLM
The Skyspan GCXLM is a large-format circular glass skylight designed for applications where a single pane exceeds practical size limits. Built on the same thermally broken, self-draining system as the GCXL, the GCXLM uses a single structural mullion to form two matching semi-circular glass panels, enabling significantly larger diameters while maintaining a refined architectural appearance.
Manufactured in Australia with a fully welded aluminium frame and high-performance laminated or double-glazed glass, the GCXLM is suited to premium residential, commercial, and public projects requiring scale without compromising performance or design intent.
The glazing is trafficable for cleaning and maintenance, meeting AS1288 requirements for overhead installations.
Thermal Break System
The GXL incorporates a thermally broken, self-draining frame system engineered to reduce thermal bridging and support Section J and NatHERS performance requirements.
An integrated condensation gutter and weep-hole drainage system manages moisture at the frame, improving durability and preventing internal water ingress.
Key Benefits
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Thermal Break Frame — reduces heat transfer and helps maintain interior temperature stability.
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Condensation Management — gutter and weep holes control moisture and protect internal finishes.
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Energy Performance — improves thermal efficiency and reduces HVAC load in conditioned spaces.
Glazing Options
Tint Options
Custom tinting options and Ceramic Frit Patterns also available. Above images are for illustrative purposes only—actual tint colors may vary due to lighting and screen display.
| Glazing | U-Value | SHGC |
|---|---|---|
| Centre of Glass Values: | ||
| Single Glazed (Clear) | 3.6 | 0.63 |
| Double Glazed (Clear) | 1.3 | 0.27 |
| Double Glazed (Grey Tint) | 1.3 | 0.26 |
| Double Glazed (White Translucent) | 1.3 | 0.24 |
| System Values: | ||
| Double Glazed (Clear) | 2.7 | 0.25 |
On a project specific basis, higher performance energy ratings up to SHGC 0.18 are available for maximum width of 2,000mm & maximum length of 3,500mm
| System Type | Large-format thermally broken architectural glass skylight |
| Frame Construction | Welded aluminium frame with integrated thermal break |
| Drainage System | Self-draining design with condensation gutter and 6 mm weep holes |
| Trafficable Use | Trafficable for cleaning and maintenance (AS1288 Section 6) |
| Roof Pitch Suitability | 3° – 60° (5° minimum recommended for water runoff) |
| Flashing Material | 0.75 mm Zincalume® (standard) or Stainless Steel / Colorbond® Ultra |
| Finish Options | Powder coated to any Colorbond®, Dulux or Interpon colour |
| BAL Rating | BAL-29 compliant (non-combustible aluminium, steel and glass) |
| Wind Region | Tested to Cyclone Region C3 (AS4285 Debris Impact Test) |
| Compliance Standards | AS 4285:2019 – Rooflights AS 1288:2021 – Glass in Buildings AS 3959:2018 – Bushfire Construction AS/NZS 1170 Series – Structural Design Actions |
| Warranty | 7 Years (manufacturing defects) |
| Made In | Australia |
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