Thermal Transmission Standards
EN 10077-1 – EN 10077-2
Between 1.5 and 2 W/m²K
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).
European standards for thermal insulation
EN 10077-1 & EN 10077-2
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 transmittance – Part 1: General principles
- EN 10077-2: Thermal performance of windows, doors, and shutters – Calculation of thermal transmittance – Part 2: Numerical method for frame profiles
The standards define 7 classes, ranked in ascending order of thermal transmittance (U):
Class T6 thus achieves the best thermal transmittance.
WARNING ⇒ Legal value in Belgium: T4 ≤ 2.0 W/m²K!
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 |
 Resistance classHeinen |
T0 T1 T2 T3 T4 T5 |
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