Thermal insulationThermal insulation EN 10077-1 & EN 10077-2 : T0, T1, T2, T3, T4, T5

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 thermal insulation capability.

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

Standards table

European standards EN 10077-1
EN 10077-2
Symbols T
Resistance class According to declared Uw values:
T0: >3.5 W/m2K
T1: ≤3.5 W/m2K
T2: ≤3.0 W/m2K
T3: ≤2.5 W/m2K
T4: ≤2.0 W/m2K
T5: ≤1.5 W/m2K
T6: ≤1.0 W/m2K
Thermal insulation performance featureResistance class
Heinen
T0
T1
T2
T3
T4
T5

Standards

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

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

Class T6 thus obtains the best thermal insulation.
N.B. => Legally defined value in Belgium:  T4 ≤ 2.0 W/m²K!

Tableau des normes

Normes européennes EN 10077-1
EN 10077-2
Symboles T
Performance transmission thermiqueClasse de résistance
Heinen
Selon valeurs déclarées Uw :
T0 : >3.5 W/m2K
T1 : ≤3.5 W/m2K
T2 : ≤3.0 W/m2K
T3 : ≤2.5 W/m2K
T4 : ≤2.0 W/m2K
T5 : ≤1.5 W/m2K
T6 : ≤1.0 W/m2K

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