Table 22 Outside Surface Resistance (Table A3.6 CIBSE Guide)

Surface resistance for stated exposure
Building
element
Emissivity
of surface
(m²K/W)
 
 
Sheltered
Normal
Severe
Wall
High
0.08
0.06
0.03
 
Low
0.11
0.07
0.03
 
 
 
 
 
Roof
High
0.07
0.04
0.02
 
Low
0.09
0.05
0.02
 
Notes:
1         Form (shape) factor for radiative heat transfer is taken to be unity
2         High emissivity is taken as 0.9, low emissivity is taken as 0.05.