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depiction:

DAm 02 b Reinforced concrete flat roof, rear ventilation

 Ceiling, roof: flat or pitched roof exposed to outside air – back-ventilated – heat flow ascending (BG1) – IBO benchmarks 2012
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0,102 W/m²K
A++
A+
A
B
C
D
E
F
G
OI-Class (BG1)4
A
mass 536,9 kg/m²
PENRT 900 MJ/m²
GWP total -0,460 kg CO2/m²
AP 0,246 kg SO2/m²
no. type layer d
cm		 λ
W/mK		 R
m²K/W		 ΔOI3
pts/m²
1 homogene Schichthomogene Schicht Abdichtung PE (Polyethylene (PE) sealing sheeting) 0,18 ¹ ¹ ² 7
2 homogene Schichthomogene Schicht PP fleece 0,02 ¹ ¹ ² 0
3 homogene Schichthomogene Schicht Timber (475 kg/m³ - e.g. spruce/fir) - rough, technically dried 2,40 ¹ ¹ ² 0
4 inhomogene Schichtinhomogene Schicht inhomogeneous (parts normal to the eaves) 12,00      
    56,3 cm (90%) Vertical air layer, heat flow up 116 < d <= 120 mm 12,00 ¹ ¹ ² 0
    6,3 cm (10%) Timber (475 kg/m³ - e.g. spruce/fir) - rough, technically dried 12,00 ¹ ¹ ² 0
5 homogene Schichthomogene Schicht Dachauflegebahn PE, diffusionsoffen (Polyethylene (PE) roof underlay - open to diffusion) 0,02 0,500 0,00 ² 1
6 homogene Schichthomogene Schicht Timber (475 kg/m³ - e.g. spruce/fir) - rough, technically dried 2,40 0,120 0,20 0
7 inhomogene Schichtinhomogene Schicht inhomogeneous (parts parallel to the eaves) 4,00      
    58,5 cm (94%) Cellulose horizontal cavity wall insulation (36 kg/m³) 4,00 0,041 0,98 1
    4 cm (6%) Timber (475 kg/m³ - e.g. spruce/fir) - rough, technically dried 4,00 0,120 0,33 0
8 inhomogene Schichtinhomogene Schicht inhomogeneous (parts parallel to the eaves) 32,00      
    61,2 cm (98%) Cellulose horizontal cavity wall insulation (36 kg/m³) 32,00 0,041 7,80 6
    1,3 cm (2%) OSB boards (650 kg/m³) 32,00 0,130 2,46 2
9 inhomogene Schichtinhomogene Schicht inhomogeneous (parts parallel to the eaves) 4,00      
    58,5 cm (94%) Cellulose horizontal cavity wall insulation (36 kg/m³) 4,00 0,041 0,98 1
    4 cm (6%) Timber (475 kg/m³ - e.g. spruce/fir) - rough, technically dried 4,00 0,120 0,33 0
10 homogene Schichthomogene Schicht Normal concrete with reinforcement 1 % (2300 kg/m³) 20,00 2,300 0,09 46
11 homogene Schichthomogene Schicht Clay plaster 1,50 0,810 0,02 1
    Rsi / Rse = 0,100 / 0,100  
    R' / R'' (max. relative error: 0,6%) = 9,828 / 9,711  
    building element 78,52   9,769 63
¹ not relevant
² layer is OI-relevant from BG1
³ U value (Heat transfer coefficient) calculated according to ÖNORM EN ISO 6946.
4 For the OI class, the U-value of the component is taken into account in addition to the ecological key figures