The exterior surface
The first thing you need to consider is the exterior surface of your flat roof window. The dome with glazing has an advanced design for extra insulation and is available in either a clear or opaque finish.
If you are looking for a state-of-the-art solution for your living spaces, consider VELUX glass rooflights. The VELUX flat glass rooflight is designed with our award-winning glass-to-edge design, slim frame and choice of either double or triple glazing for noise control and high energy efficiency. Or select our curved glass rooflight with the added 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.
If you just want to bring daylight into uninhabited spaces, such as garages, sheds, or smaller industrial buildings, our dome without glazing 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 a dome with glazing is 150 x 150cm with two-layer glazing.
For bigger window sizes, choose our flat or curved glass rooflights, with up to 200 x 100cm sizes, all available in double or triple-layer glazing.
The glazing of your windows
For good sound insulation, energy efficiency and noise control for outside traffic and other sounds, the dome with glazing offers an integrated two-layer insulating glass unit with inner laminated glass.
For even better sound insulation and energy efficiency, consider our best-in-class glass rooflights (both flat and curved) that are available with double or triple glazing.
We also have 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.