Combi Flat Roof System

Often a flat roof leaves areas in a room where light cannot fully reach. With a Keylite FRS (Flat Roof System) you can allow light into these areas.

Keylite Flat Roof Windows come complete with shaped, insulated wooden kerbs and flashing kits.

To maximise the amount of natural light entering the room, the front and back framing is angled.

The flat roof windows system is also available with Keylite Electric Operation and Smoke Ventilation Systems.

Keylite Combi FRS is now available (18mm spacing between frames). Contact the Keylite Sales Team for more information.


Year Guarantee

Expanding Thermal Collar

Just pull the tapes and the foam expands to fill the gap between the window and the roof timbers

View Futuretherm

All Weather Ventilation

Keylite Roof Windows all provide trickle ventilation, even with the window fully closed and securely locked.

Ventilation Filter

The built-in insect filter ensures only clean, fresh air passes into the room.

Easy Installation

Simple, Easy.. Fast. From box to roof in 2 minutes. Keylite innovations combine for faster, easier installation.

Installation Video



All our roof windows are recessed for an in roof look.


All our roof windows are recessed for an in roof look.

Roof Window Sizes

Window Size 1110x780 1110x980 1330x1180 1570x980 1570x1180 1570x1400 1890x1600 2290x1180
Structural Opening Size 1100x1000 1100x1200 1320x1400 1560x1200 1560x1400 1560x1620 1880x1820 2280x1400
Pine Finish
Keylite Therm - Product Code CFRS-CP-01-T CFRS-CP-02-T CFRS-CP-03-T CFRS-CP-04-T CFRS-CP-05-T CFRS-CP-06-T CFRS-CP-07-T CFRS-CP-08-T
White Finish
Keylite Therm - Product Code CFRS-WF-CP-01-T CFRS-WF-CP-02-T CFRS-WF-CP-03-T CFRS-WF-CP-04-T CFRS-WF-CP-05-T CFRS-WF-CP-06-T CFRS-WF-CP-07-T CFRS-WF-CP-08-T

Optional Upgrades

White Finish

A fresh and contemporary look. The wipe clean moisture resistant finish is ideal for use in kitchens, bathrooms and other humid areas.

Electric Operation

Electric Operation Fingertip control for out of reach locations.

Smoke Vent

Designed to open automatically in the event of a fire.

Why Keylite?

Visit our Why Keylite? Page

Service & Support

Service & Support

Our technical experts are on hand to advise and assist you at the design and specification stage.

Service & Support

Patented Innovation

Our patents mean that other conventional roof windows do not share many of our extraordinary features.

Service & Support

10 Year Guarantee

We are confident that our products will give trouble free performance throughout this period and beyond.

Service & Support

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Only available in
England, Scotland & Wales