Frame
Thermally broken aluminium
Double-Glazed Flat Rooflights · Overhead Glazing
MADE-TO-MEASURE FLAT ROOFLIGHTS
Double-Glazed
Flat Rooflights
Two glass layers and one insulating cavity, specified with a Low-E coating, warm-edge spacer and heat-treated laminated inner pane for the roof opening.
Double glazed
Thermally broken
UK manufacture
10-year IGU seal warranty
Technical support
Supply or installation
Double glazing. One insulating cavity.
CLEAR DETAILS. EASY CHOICES.
Find what you need.
Product information, installation
and documents in one place.
DOUBLE-GLAZED FLAT ROOFLIGHTS
Designed for your project.
A double-glazed rooflight uses an outer pane and an inner pane separated by a sealed cavity. The inner pane may itself be laminated: its bonded sheets still form the inner glass layer of the insulating unit.
This page explains the double-glazed specification. The fixed flat rooflight system, overall opening detail, frame and service options are covered on our flat rooflights page. Triple glazing is a separate choice with an additional glass layer and cavity.
Select the proposed glass build-up against the project thermal target, solar exposure, span and weight. Glass-only Ug and whole-rooflight values should be compared on the same installation-angle basis.
GLAZINGDouble glazed
FRAMEThermally broken
SERVICESupply or install
THE COMPLETE SYSTEM
Specification at a glance.
Frame
Thermally broken aluminium
Unit
Double-glazed insulated glass
Inner pane
Heat-treated laminated safety glass
Outer pane
Heat-soak-tested toughened
Cavity
Argon-filled, project specific
Upstand
Typically 150mm above roof
Finish
RAL 7016, 9005 or custom
Final Ug and whole-rooflight performance depend on size, orientation, spacer, coatings, frame and calculation method.
YOUR PROJECT. YOUR OPTIONS.
Choose the right glass and finish.
01
Solar-control outer pane
Helps reduce heat gain and glare in larger or strongly exposed rooms.
02
Acoustic laminate
A specialist inner laminate can improve sound reduction near roads, railways or aircraft routes.
03
Easy-clean coating
A coated outer pane can reduce dirt adhesion and simplify routine maintenance.
04
Custom colour
Powder-coated frames can coordinate with roof finishes, windows and external metalwork.
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
Double-Glazed Flat Rooflights gallery.
Select a photograph
to look closer.
Fixed flat rooflights in a completed extension.
Interior beneath fixed flat rooflights in Enfield
Fixed flat rooflights on the completed Enfield roof
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
Performance without unnecessary weight.
The cavity, coatings, warm-edge spacer, frame and laminated inner pane are selected as one rooflight assembly.
PERFORMANCE WITH CONTEXT
Double glazing performance. Glass, cavity and frame.
Glass, frame, support and intended use are considered together.
Plan the flat rooflight around the opening.
For the frame, upstand, site measurement, installation and the complete fixed rooflight arrangement, use our flat rooflights page.
Laminated overhead safety
A laminated inner pane helps retain glass in the event of breakage and is specified as standard for overhead protection.
Made for the prepared kerb
Fixing, weathering height and a positive fall are agreed before manufacture to keep installation clear.
Confirmed for your project
Final Ug and whole-rooflight performance depend on size, orientation, spacer, coatings, frame and calculation method.
BEFORE YOU CHOOSE
Useful answers.
Is double glazing suitable for a flat rooflight?+
It can be suitable for many residential projects when the complete rooflight satisfies the project energy and comfort requirements.
What is the typical glass build-up?+
A typical unit may use a heat-soak-tested toughened outer pane, an argon-filled cavity and a heat-treated laminated inner pane, with Low-E coating positioned as part of the approved build-up. Final thicknesses are project specific.
Is triple glazing always better?+
Not automatically. Triple glazing can improve thermal performance but adds weight and cost. The right choice depends on the project target and complete assembly.
Can it be made to any size?+
It is made to measure within glass-processing, loading, transport and lifting limits. Larger openings can use modular panes.
What upstand is required?+
The weathered upstand would normally finish at least 150mm above the completed roof surface, with a positive fall formed to shed water.
Do you offer installation?+
Yes. Supply-only and suitable supply-and-install projects are available across London and the UK.
Does laminated inner glass make this triple glazing?+
No. The two bonded sheets and interlayer form one laminated inner pane. A double-glazed insulating unit still has one sealed cavity; a triple-glazed unit has two.
Can double glazing include solar control?+
Yes. A solar-control coating can be specified in a suitable double-glazed unit. Solar factor and visible light transmission are considered separately from its U-value.
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
Need a double-glazed 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
Fixed flat rooflights in a completed extension.
These photographs show the frame and finished opening. The number of panes, coatings and calculated performance are confirmed in the quotation, not inferred from a photograph.