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.