Double Brick Cavity Wall

All Weathers R Value U Value Emissivity R Value
Units m2xK/W
W/(m2xK)   hrxft2xF/Btu
Outside air film 0.030     0.170
110mm brickwork 0.180     1.022
20mm sealed air cavity 0.780   0.030 4.430
Insulation 0.130     0.738
20mm sealed air cavity 0.780   0.030 4.430
110mm brickwork 0.180     0.437
Indoor air film 0.120     0.682
Total R 2.200 0.455   12.496