Frame
Thermally broken aluminium
Triple-Glazed Flat Rooflights · Overhead Glazing
ENHANCED THERMAL ROOF GLAZING
Triple-Glazed
Flat Rooflights
Three glass layers and two insulating cavities for projects with demanding thermal requirements, with the additional pane weight and frame capacity reviewed together.
Triple glazed
Laminated inner
UK manufacture
10-year IGU seal warranty
Technical support
Supply or installation
Triple glazing. Two insulating cavities.
View 1
AT A GLANCE
Key features.
Unit
Triple-glazed insulated glass
Inner pane
Heat-treated laminated safety glass
Toughened panes
Heat-soak tested
Cavities
Warm-edge, argon-filled
Options
Solar and acoustic control
CLEAR DETAILS. EASY CHOICES.
Find what you need.
Product information, installation
and documents in one place.
TRIPLE-GLAZED FLAT ROOFLIGHTS
Designed for your project.
A triple-glazed rooflight adds an intermediate pane and a second sealed cavity. Coatings, cavity widths and glass processing are selected as one build-up; a laminated inner pane remains a separate overhead-safety decision.
The extra glass can improve the glass-centre thermal performance of a suitable specification, but the complete rooflight also depends on its frame, edge detail and installation angle. A lower vertical window figure should not be presented as a horizontal rooflight result.
Confirm the thermal target before choosing the extra pane. The roof support, frame depth, glass weight, delivery route and lifting arrangement need to accommodate the proposed unit. The complete fixed system and installation detail are explained on our flat rooflights page.
GLAZINGTriple glazed
SAFETYLaminated inner
SIZESMade to measure
THE COMPLETE SYSTEM
Specification at a glance.
Frame
Thermally broken aluminium
Unit
Triple-glazed insulated glass
Inner pane
Heat-treated laminated safety glass
Toughened panes
Heat-soak tested
Cavities
Warm-edge, argon-filled
Options
Solar and acoustic control
Finish
Standard or custom RAL
Published values must state the glass build-up, orientation and whether they refer to the centre pane or complete rooflight.
YOUR PROJECT. YOUR OPTIONS.
Choose the right glass and finish.
01
Low-emissivity coatings
Coatings are positioned within the unit to reduce heat loss while maintaining useful daylight.
02
Solar control
Useful for large south- or west-facing openings where overheating and glare need attention.
03
Acoustic enhancement
Asymmetric panes and acoustic laminates can be reviewed where outside noise is significant.
04
Modular layouts
Larger openings can be divided into coordinated panels with weather-sealed structural silicone joints.
FROM ENQUIRY TO INSTALLATION
Supply or fully installed.
Choose supply-only to approved dimensions or ask us to coordinate measurement, delivery and installation. Offloading and installation by others are excluded from supply-only unless expressly quoted.
01
Send the project information
Share drawings, approximate dimensions, postcode, roof build-up and intended use.
02
Technical review
We review geometry, glass, loads, drainage, access and the supporting construction.
03
Approve the drawings
Project-specific drawings confirm the arrangement before anything is manufactured.
04
Manufacture and install
The approved system is manufactured and installed by Overhead Glazing. Supply-only is available for suitable fixed flat rooflights; the quotation confirms the service scope.
The roof structure, prepared upstand, waterproofing, lifting and access responsibilities are agreed with your project team before work begins.
YOUR PROJECT PRICE
Quoted to your specification.
Based on the glass, dimensions and agreed service.
LEAD TIME
Agreed for your project.
Programme confirmed after specification and drawing review.
BEFORE MANUFACTURE
Site measure
Ask us to check the opening and installation dimensions.
OUR SPECIALIST TEAM
Installation
Fitting, access and lifting requirements agreed with your project team.
Final cost and programme are confirmed for your specification and agreed scope.
THE DETAIL, FROM EVERY ANGLE
Triple-Glazed Flat Rooflights gallery.
Select a photograph
to look closer.
Bromley: a triple-glazed flat rooflight.
More from our projects
OVERHEAD GLAZING IN MOTION
See our rooflight work.
Our bespoke rooflight film · loads on play
Play film
THE DETAIL MAKES THE DIFFERENCE
Better comfort starts with the complete assembly.
Glass coatings, cavities, spacer bars, frame, edge support and installation detail all influence whole-rooflight performance.
PERFORMANCE WITH CONTEXT
Triple glazing performance. Insulation, weight and support.
Glass, frame, support and intended use are considered together.
Start with the rooflight and its supporting detail.
Our flat rooflights page covers the complete fixed system. Use this specification page when assessing whether the third pane and second cavity suit your thermal target and project constraints.
Orientation clearly explained
We distinguish glass-centre Ug values from the performance of the completed rooflight and provide project-relevant information.
Weight planned from the start
Triple-glazed units are heavier, so structure, delivery, lifting and safe installation are reviewed before order.
Confirmed for your project
Published values must state the glass build-up, orientation and whether they refer to the centre pane or complete rooflight.
BEFORE YOU CHOOSE
Useful answers.
Why choose triple glazing?+
It may improve thermal comfort and energy performance where the complete rooflight, building fabric and orientation justify the additional glass.
What U-value can it achieve?+
The value depends on size, glass, orientation and frame. We provide the relevant project specification rather than relying on a vertical centre-pane value.
Is triple glazing much heavier?+
Yes. The third pane and second cavity increase weight, so support, lifting and installation access must be checked.
Can triple glazing include solar control?+
Yes. Solar-control coatings can be combined with triple glazing where heat gain is a concern.
Is the inner pane laminated?+
Yes. Heat-strengthened laminated or heat-soak-tested toughened laminated inner glass is specified for overhead safety.
Can you install across the UK?+
Yes. We review suitable supply-and-install projects across London and the UK.
Does triple glazing remove the need for solar control?+
No. Thermal insulation and incoming solar heat are different design questions. A triple-glazed unit can still need solar-control glass, with the coating and light transmission assessed for the room.
Can I upgrade an existing frame to triple glazing?+
It cannot be assumed. The available glazing depth, glass weight, frame support, drainage and lifting access must be reviewed before an upgrade is proposed.
What warranty applies to this product?+
Qualifying insulating glass units carry a 10-year seal warranty, subject to the written terms supplied with the order. This is not a blanket guarantee against breakage or a 10-year frame or installation warranty. Installation labour carried out by us is covered for five years, subject to the written terms.
CUSTOMER FEEDBACK
Hear from our customers.
Read feedback about Overhead Glazing on Google.
LET’S TALK ABOUT YOUR PROJECT
Planning a high-performance flat rooflight?
Share your postcode, drawings and project details. We’ll help confirm a suitable specification.
Supply or fully installed.
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PROJECTS & PRACTICAL ADVICE
From the drawing to the roof.
PRODUCT IN CONTEXT
Bromley: a triple-glazed flat rooflight.
The finished rooflight shows how a triple-glazed unit sits within its perimeter frame. Its confirmed build-up and thermal values are project-specific.