GRL Glideline Roof Light
GRL Glideline Roof Light
The GRL Flat Rooflight brings natural light, thermal comfort, and a sleek finish to any modern flat roof design.
Contemporary Inside and Out
Near-frameless appearance
Standard & Bespoke Sizes
Get your quote:
mm x mm
1. Width: Measure horizontally across the opening from edge to edge at the top, middle, and bottom. Use the smallest measurement.
2. Length: To measure the length, take measurements from end to end along the longest side. If there are variations, measure at multiple points and use the longest measurement to ensure accuracy.
1 pane
1. Width: Measure horizontally across the opening from edge to edge at the top, middle, and bottom. Use the smallest measurement.
2. Length: To measure the length, take measurements from end to end along the longest side. If there are variations, measure at multiple points and use the longest measurement to ensure accuracy.
Black
1. Width: Measure horizontally across the opening from edge to edge at the top, middle, and bottom. Use the smallest measurement.
2. Length: To measure the length, take measurements from end to end along the longest side. If there are variations, measure at multiple points and use the longest measurement to ensure accuracy.
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Overview
Ultra-Slim Sightlines
Minimal frames from 0–20mm create a near-frameless appearance and maximise light entry.
Thermal Efficiency All Year Round
Achieve U-values from 1.4 W/m²K (double) or as low as 1.0 W/m²K (triple) to reduce heat loss and lighting costs.
Acoustic and Weather Performance
Sound insulation up to 41dB with Class 4 air tightness and Class 7A water resistance for year-round comfort.
Frameless Glass Joints
Glass-to-glass silicone-sealed joints eliminate bulky corners and support clean, architectural lines.
Solar Control and Self-Cleaning Options
Upgrade with specialist glazing to reduce heat gain and cleaning requirements, ideal for hard-to-reach areas.
Secure and Safe
Built from strong, corrosion-resistant aluminium and high performance safety glass.
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Flat Rooflights — Designed for Light and Comfort
The GRL is ideal for flat roof extensions, loft conversions, and internal spaces lacking natural daylight. Its sleek design ensures maximum glass area with minimal frame interruption—perfect for kitchens, stairwells, or hallways where natural light from above improves rooms of any size.
You can specify the GRL in custom lengths with widths up to 1800mm, making it suitable for long corridors or large open-plan living spaces. With high insulation, reduced glare, and optional ventilation, it enhances comfort and usability throughout the year.
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Built In-House by Glideline
We manufacture every GRL rooflight in our own facility, using premium-grade aluminium and precision manufacturing techniques. Each unit is built to order and fully tested to meet high standards of thermal insulation, weather resistance, and structural strength.
Whether installed as a single pane or a run of frameless modules, the GRL is engineered for a flawless integration with the flat roof structure. Our consistent, detail-focused manufacturing ensures a clean finish and long-term durability.
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Support for Installers and Designers
Glideline works with installers, architects, and developers to make specifying and fitting rooflights simple. We provide detailed technical data, CAD drawings, and installation advice to support smooth delivery on site.
With fast turnaround times, optional features, and colour-matched finishes, we offer more than just a rooflight—we provide a dependable architectural solution for modern flat-roof glazing projects.
Technical specifications
General
Sightlines: 0-20mm
Glazing: 50mm max, 32mm min
Maximum dimensions: No max length, max width 1800mm
Colour options: Black 9005 Textured
Options
Solar control glazing
Frameless glass-to-glass joints
Self-cleaning glass
Test data
Double glazing: Uw from 1.4 (W/m²K)
Triple glazing: Uw ≥ 1.0 (W/m²K)
U-Value
Acoustic insulation: Rw up to 41 dB
Air permeability: Class 4
Water tightness: Class 7A
Wind resistance: Class C5
Security test: PAS24 passed
Colour Finishes
Available from Glideline
Powder Coating RAL Finish
9005M Textured
Available in 150+ RAL finishes
Anodized aluminium
Class 15; 15-19 micrometer coating for external use as standard
Class 20; 20-24 micrometer coating for use in aggressive conditions, industrial areas and marine pollution
Class 20; 20-24 micrometer coating for use in aggressive conditions, industrial Silver brushed, silver rough brushed, bright silver, matte silver, brushed steel, rough brushed steel, brushed champagne re-polished, bright gold, rough brushed inox re-polished, brushed stainless steel, rough brushed ivory re-polished, brushed bronze, rough brushed bronze and re-polished, rough brushed copper re-polished, rough brushed Bordeaux re-polished, rough brushed green, rough brushed blue re-polished, rough brushed grey re-polished, matte black and marine pollution
Reviews
Thank you to the installers Joe and Luke for their hard work. It wasn't easy going up all the stairs but they were happy doing so and I couldn't be happier with the doors. Also Henry has been fantastic from sta…
Glideline installed 6 sets of sliding doors in our house. This was a major investment for us so we wanted it to be just right. David and all the team were friendly and helpful from start to finish. Henry was…
FAQs
How do I find pricing?
We price all of our flat roofs bespoke to each customer. This is because each aluminium rooflight is made specific to each customer’s requirements.
Are they environmentally friendly?
Aluminium is a sustainable resource that is also recyclable, being able to be reused time and time again. Because they’re energy efficient, they’ll also reduce the carbon footprint of your customer’s home.
Are they secure?
We have included several modern locking mechanisms in our aluminium rooflights to keep your project secure. Tamper proof fasteners will prevent intruders from attempting to break in through your flat roofs.
If we haven’t answered your question, Send us a message