Project guide
Rooflight Glazing and Performance Guide
Choose roof glazing around the room it serves. Insulation, sunlight, privacy and maintenance are different questions, so a single headline number cannot answer all of them.
Ask which U-value is being quoted
A glass U-value describes the insulating glass unit. A whole-product U-value includes the frame and other parts of the assembly. Ask for the value relevant to your complete rooflight at the specified size, and give that information to your building designer. Compare figures measured on the same basis rather than ranking products using unrelated headline claims.
Balance light with solar gain
The amount of daylight you want depends on the room layout, nearby shading and the position of the rooflight. Ask for both light-transmission and solar-factor information for the selected glass. A tint name alone does not establish its performance, and solar-control glass should be considered alongside ventilation and the overall design of the room.
Choose the safety glass for the application
Ask the designer or installer to confirm the appropriate overhead-glazing specification, including whether an inner laminated pane is needed. State the height above the floor and whether the opening is over water or another unusual location. Do not treat toughened and laminated glass as interchangeable descriptions.
Understand the maintenance requirement
Self-cleaning coatings can reduce some cleaning, but the frame, seals and drainage still need attention. Ask for the glass manufacturer's care instructions and compatible cleaning products. Plan safe access for future maintenance as part of the project, particularly where the rooflight is above an island or stairwell.
Build a useful comparison
Request a written summary of glass build-up, tint, coating, whole-product performance, frame finish and warranty terms. Check what is actually included in the online configuration or quotation. If an option appears in a manufacturer brochure but not in the designer, ask us to confirm availability before assuming it is included.
Choose your product and check its specification
Use the specification for your chosen range, then enter the confirmed measurements and options in its designer. FlatLite configurations are submitted as quotation enquiries.
Need help with your project?
Send us your product choice, dimensions and installer’s drawing so we can help you identify the right specification and documents.
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