Building envelope

Required U-value (W/m2∙K)

Exterior wall

Adjacent to outside directly

Less than 0.36

Adjacent to outside indirectly

Less than 0.49

Roof

Adjacent to outside directly

Less than 0.20

Adjacent to outside indirectly

Less than 0.29

Floor

of the lowest floor

Adjacent to outside directly

Floor heating

Less than 0.30

No floor heating

Less than 0.41

Adjacent to outside indirectly

Floor heating

Less than 0.43

No floor heating

Less than 0.58

Sidewall of apartment building

Less than 0.27

Floor

between levels

Floor heating

Less than 0.81

No floor heating

Less than 1.16

Fenetrations

and doors

Adjacent to outside directly

Apartment

Less than 2.10

Others

Less than 2.40

Adjacent to outside indirectly

Apartment

Less than 2.80

Others

Less than 3.20