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depiction:

DAl 01 a Wood rafter steeply-pitched roof

Ceiling, roof, 30°: flat or pitched roof exposed to outside air – back-ventilated – heat flow ascending (BG1) – IBO benchmarks 2012
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0,101 W/m²K
A++
A+
A
B
C
D
E
F
G
OI-Class (BG1)4
A+
mass 126,5 kg/m²
PENRT 924 MJ/m²
GWP total -23,0 kg CO2/m²
AP 0,222 kg SO2/m²
no. type layer d
cm		 λ
W/mK		 R
m²K/W		 ΔOI3
pts/m²
1 homogene Schichthomogene Schicht Clay roof tiles (2000 kg/m³) 2,50 ¹ ¹ ² 14
2 inhomogene Schichtinhomogene Schicht inhomogeneous (parts parallel to the eaves) 3,00      
    53,1 cm (85%) Vertical air layer, heat flow up 26 < d <= 30 mm 3,00 ¹ ¹ ² 0
    9,4 cm (15%) Timber (475 kg/m³ - e.g. spruce/fir) - rough, technically dried 3,00 ¹ ¹ ² 0
3 inhomogene Schichtinhomogene Schicht inhomogeneous (parts normal to the eaves) 5,00      
    56,3 cm (90%) Vertical air layer, heat flow up 46 < d <= 50 mm 5,00 ¹ ¹ ² 0
    6,3 cm (10%) Timber (475 kg/m³ - e.g. spruce/fir) - rough, technically dried 5,00 ¹ ¹ ² 0
4 homogene Schichthomogene Schicht Porous bituminised wood fibreboard (250 kg/m³) 2,00 0,057 0,35 5
5 inhomogene Schichtinhomogene Schicht inhomogeneous (parts parallel to the eaves) 10,00      
    56,3 cm (90%) Glass wool MW(GW)-W (18 kg/m³) 10,00 0,038 2,63 6
    6,3 cm (10%) Timber (475 kg/m³ - e.g. spruce/fir) - rough, technically dried 10,00 0,120 0,83 0
6 inhomogene Schichtinhomogene Schicht inhomogeneous (parts normal to the eaves) 24,00      
    56,3 cm (90%) Glass wool MW(GW)-W (18 kg/m³) 24,00 0,038 6,32 16
    6,3 cm (10%) Timber (475 kg/m³ - e.g. spruce/fir) - rough, technically dried 24,00 0,120 2,00 0
7 homogene Schichthomogene Schicht Internal chipboard (650 kg/m³) 2,20 0,130 0,17 4
8 homogene Schichthomogene Schicht Dampfbremse PE (Polyethylene (PE) vapour brake) 0,02 0,500 0,00 ² 1
9 inhomogene Schichtinhomogene Schicht inhomogeneous (parts parallel to the eaves) 6,00      
    56,3 cm (90%) Glass wool MW(GW)-W (18 kg/m³) 6,00 0,038 1,58 4
    6,3 cm (10%) Timber (475 kg/m³ - e.g. spruce/fir) - rough, technically dried 6,00 0,120 0,50 0
10 homogene Schichthomogene Schicht Gypsum plasterboard (900 kg/m³) 1,50 0,250 0,06 4
11 homogene Schichthomogene Schicht Gypsum plasterboard (900 kg/m³) 1,50 0,250 0,06 4
    Rsi / Rse = 0,100 / 0,100  
    R' / R'' (max. relative error: 4,1%) = 10,307 / 9,499  
    building element 57,72   9,903 57
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