Indicates the amount of heat passing through the flat roof window. The lower the value, the better the insulation.

The Ut-value, or thermal transmittance, measures the amount of heat that passes through the window. This is an indication of the insulation properties of the window. A lower Ut-value means that the window insulates better and therefore loses less heat. This is especially important in colder climates or where energy efficiency is a priority.

Stands for light transmission and indicates how much daylight passes through the flat roof window.

The LT-value (light transmission) indicates how much daylight can pass through the window. A higher LT-value means that more natural light enters the room. This can contribute to a pleasant indoor environment and can even result in savings on lighting costs. Choosing the right LT-value depends on the specific needs of the room.

The solar energy transmission coefficient. Indicates how much solar heat is allowed through the flat roof window. The lower the value, the better the protection.

This is a measure of how much solar heat is allowed through the window. A low g-value means that the skylight effectively blocks the sun's heat, which is especially beneficial in warm climates or areas that are prone to overheating.

The sound insulation value. A higher value indicates that the flat roof window insulates better against outside noise.

A higher Rw-value indicates that the window is more effective at reducing outside noise, which results in a quieter home. This is particularly valuable in areas with heavy traffic or other disturbing noise sources.

• Clear glass: maximum light transmission, perfect for spaces where natural daylight is desired.
• Opal glass: distributes light evenly and provides some degree of privacy.
• Solar control glass: heat-reflective layer that helps blocking heat from the sun.