HAMR Director, Belinda Colston, recently addressed delegates at the 2013 IALA Preservation of Lighthouse Heritage Conference, in Piraeus, Greece (3-7 June 2013). Discussing recent research at North Foreland Lighthouse, in collaboration with Trinity House, Professor Colston illustrated how excessive ventilation in an unoccupied building can increase the rate of material degradation within. This research is particularly relevant to the historic built environment, where significant buildings are often unoccupied for long periods of time, and encouraging ‘good’ ventilation is a normal conservation strategy.