Service pipes and cables that penetrate the air barrier

Gaps in the air barrier are common around water pipes, gas pipes, boiler flues and electric cables that pass through external walls (Figure 13), although they are generally hidden from view behind kitchen cupboards, bath panels, sink pedestals, toilet basins and vanity units.

Cold draughts from these areas will be an unpleasant indicator of inadequate sealing (see Figures 14 and 15). Draughts in bathrooms/shower rooms are particularly uncomfortable for occupants.