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depiction:

DAl 02 a Wood rafter steeply-pitched roof with rafter insulation

 Ceiling, roof, 30°: flat or pitched roof exposed to outside air – back-ventilated – heat flow ascending (BG1) – IBO benchmarks 2012
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0,093 W/m²K
A++
A+
A
B
C
D
E
F
G
OI-Class (BG1)4
A+
mass 118,0 kg/m²
PENRT 849 MJ/m²
GWP total -53,7 kg CO2/m²
AP 0,217 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 0,120 0,25 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 0,313 0,16 0
    6,3 cm (10%) Timber (475 kg/m³ - e.g. spruce/fir) - rough, technically dried 5,00 0,120 0,42 0
4 homogene Schichthomogene Schicht Polyethylene (PE) roof underlay - open to diffusion 0,10 0,500 0,00 5
5 homogene Schichthomogene Schicht Wood fibre WF-W (250 kg/m³) 1,60 0,057 0,28 4
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 inhomogene Schichtinhomogene Schicht inhomogeneous (parts parallel to the eaves) 18,00      
    56,3 cm (90%) Glass wool MW(GW)-W (18 kg/m³) 18,00 0,038 4,74 12
    6,3 cm (10%) Timber (475 kg/m³ - e.g. spruce/fir) - rough, technically dried 18,00 0,120 1,50 0
8 homogene Schichthomogene Schicht Polyethylene (PE) vapour brake 0,02 0,500 0,00 1
9 homogene Schichthomogene Schicht Timber (475 kg/m³ - e.g. spruce/fir) - rough, technically dried 2,50 0,120 0,21 0
10 inhomogene Schichtinhomogene Schicht inhomogeneous (parts normal to the eaves) 20,50      
    50 cm (80%) Vertical air layer, heat flow up d > 200 mm 20,50 1,563 0,13 0
    12,5 cm (20%) Timber (475 kg/m³ - e.g. spruce/fir) - rough, technically dried 20,50 0,120 1,71 -1
    Rsi / Rse = 0,100 / 0,100  
    R' / R'' (max. relative error: 6,3%) = 11,484 / 10,113  
    building element 77,22   10,799 48
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