The exterior surface
The first thing you need to consider is the exterior surface of your flat roof window. The VELUX curved glass rooflight with glass-to-edge design and the choice of either double or triple glazing for noise control and high energy efficiency. It has the benefit of a uniquely curved-shaped glass top that makes it easy for rainwater to run off the surface, even on roofs with a 0° pitch. Or select our award-winning flat glass rooflight with glass-to-edge design and slim frame.
You could also consider our dome with glazing with an advanced design for extra insulation, available in either a clear or opaque finish. If you just want to bring daylight into uninhabited spaces, such as garages, sheds, or smaller industrial buildings, our dome is the perfect, cost-efficient solution.
The size of the rooflight
Flat roof windows can provide three times more daylight than facade windows. We recommend that the size of your roof window should be at least 10% of your room floor area. VELUX flat roof windows come in a variety of sizes. The biggest size for flat and curved glass rooflights is 200 x 100cm, all available in double or triple glazing. The biggest size for a dome with glazing is 150 x 150cm with two-layer glazing.
The glazing of your windows
For insulation, energy efficiency and noise control for outside traffic and other sounds, consider the glazing of your windows. Choose two-layer glazing for good performance or three-layer glazing for the best energy efficiency and sound insulation.
VELUX also offers smoke ventilation solutions, including roof exits and burglar-proof solutions, to maximise indoor comfort and provide optimal security when choosing VELUX products.
If you have any questions about which flat roof window is best suited to your needs, please contact our Design Advisors.
Tempered glass
Tempered glass offers increased strength. Stress differences from the tempering process (‘anisotropy’) may appear in polarized light. This is not a defect — it’s a natural result of how tempered glass is made.*
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