Thermal insulation

Description and standards

 

When doors are fitted in a wall which separates two rooms that have a different operating temperature (e.g. between living areas and communal areas) or between internal premises and the external environment, they must have a thermal insulation capability.

 

 

 

To be considered as having thermal insulation properties, the door must have a U value of ≤3.5 W/m²K and guarantee minimum airtightness (class L2 minimum).

 

The thermal insulation coefficient value U is calculated according to the following European standards:

 

  • EN 10077-1: Thermal performance of windows, doors and shutters – Calculation of thermal insulation – Part 1: Simplified method
  • EN 10077-2: Thermal performance of windows, doors and shutters – Calculation of thermal insulation – Part 2: Numerical method for frames

These standards provide for 7 categories, classified in ascending order of thermal insulation (U):

 

Thermal insulation

Classes

T

T0

T1

T2

T3

T4

T5

T6

U value (W/m²K)

> 3.5

≤ 3.5

≤ 3.0

≤ 2.5

≤ 2.0

≤ 1.5

≤ 1.0

Therefore, class T6 achieves the best thermal insulation.
NB: Legal value in Belgium: T3 ≤ 2.5 W/m²K!

Results

 

For solid or glazed single or double doors:

 

From T0 to T4

 

or even T5 for very large double doors.

 

Combination of performance features

Thanks to their modular structure based on Metal+, Heinen thermal insulation products can also have other performance features combined and added to them, such as: