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A significant proportion of the heat in a house often escapes through windows and doors. Therefore, it is important to pay attention to excellent thermal insulation in these areas. The thermal performance of a front door is indicated by the so-called Ud-value .

The rule is: The lower the Ud-value of the front door, the better the insulation. A well-insulated and sealed front door ensures that cold air stays outside in winter and that your hallway is protected from the heat in summer. This means you need less energy for heating (and also for cooling in summer), making your home not only more economical but also more environmentally friendly.

The Ud-value or the thermal transmittance coefficient indicates how well the door is insulated or how much heat is lost through 1 m² of the door surface when the temperature drops by 1 °C. This value should be as low as possible. For modern front doors, the U-value should not exceed 1.3 W/m²K (watts per square metre and kelvin). Experts recommend a Ud-value below 1.3 W/m²K. The lower, the better.

The front doors from our range are characterised by a U-value from 0.61 W/m²K and are therefore suitable for both renovation of old buildings and for passive houses.

The most important factors for a well-insulated entrance door, in addition to the Ud-value, are the thickness of the door leaf and frame, the insulating material in the door leaf, the number of seals and their design between door leaf, threshold and frame, as well as the insulation of the glazing.