Insulation values
Regarding the measures for insulation for the wall, roof and floor the specifications are found below.
In the Sustainability API the input regarding insulation concerns the qualitative indication of the insulation thickness (none, moderate, good, very good). This input is converted to input for the different methods.
Input to API | Construction year | Input energylabel |
0 (no insulation) | till 1991 | no post insulation |
from 1992 | not possible | |
1 ( mediocre insulation) | till 1964 | |
1965-1974 roof | no post insulation | |
1965-1974 wall and floor | post insulation | |
1975-1991 | no post insulation | |
from 1992 | not needed | |
2 (good insulation) | till 1991 | post insulation |
from 1992 | not needed | |
3 (very good insulation) | till 1991 | extreme post insulation |
from 1992 | extreme post insulation |
With moderate insulation, the starting point is that the resulting Rc value at the energy label is conservative compared to the Rc value at the EI. This means that in a number of cases is chosen for "not post-insulated". A specific Rc value is used for the EI, BENG and consumption. This depends on the insulation thickness. We assume a certain insulation thickness, which depends on the year of construction. The lambda value of insulation is 0.045 W / mK (with the EI, BENG and consumption). The basic resistance (from the non-insulating layers) is 0.15 m 2 K/W for floors, 0.36 m 2 K/W for facades and 0.22 m2 K/W for roofs.
No insulation and moderate insulation is not possible with more recent years. In those cases it says ‘NA’ the table.
Rc with 'no insulation'
Construction year | Thickness (cm) | Roof | Floor | Wall |
till 1987 | 0 | 0,22 | 0,15 | 0,36 |
1988 - till present | NA | NA | NA | NA |
Values in Rc (m2 K/w)
Rc with 'mediocre insulation'
Construction year | Thickness R/F | Thickness W (cm) | Roof | Floor | Wall |
till 1974 | 3 | 5 | 0,89 | 0,82 | 1,47 |
1975 - 1987 | 5 | 7 | 1,33 | 1,26 | 1,92 |
1988 - 1999 | 5 | 5 | 1,33 | 1,26 | 1,47 |
2000 till present | Na | NA | NA | NA | 1,47NA |
Values in Rc (m2 K/w)
Rc with 'good insulation'
Construction year | Thickness (cm) | Roof | Floor | Wall |
till 1974 | 8 | 2,00 | 1,93 | 2,14 |
from 1975 | 10 | 2,44 | 2,37 | 2,58 |
Values in Rc (m2 K/w)
Rc with 'very good insulation'
Construction year | Roof thickness | Rc | Floor thickness | Rc | Wall thickness | Rc |
all | 17 | 4,00 | 15 | 3,5 | 16 | 4,00 |
Values in Rc (m2 K/w), thickness in cm
The Rc values at level "very good" are in accordance with the advice of Milieu Centraal.
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