The Iris hut is a prefabricated steel structure used by the British military predominantly during the early part of the Second World War.
They served as barracks, workshops, and storage facilities in World War II Great Britain.
[4] However, the Iris hut had a major design flaw: it was unable to resist the weight of snow lying on the roof and had a tendency to collapse after snowfalls.
They were needed in connection with Operation Bolero, the build-up of U.S. forces in Britain for the campaign in Europe, which aimed to accommodate 1,446,000 U.S. service personnel on British soil by 30 April 1944.
It is unclear what the Iris huts were used for, but the presence of ventilated panels suggests that they were used to store flammable goods.