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Every part of the cardboard needs to be treated with a fire retardant. To stop the cardboard acting like a sponge, a chemical is added to the basic pulp to make it more water-resistant.
The strength is given by the solid card and insulation is provided by the air trapped inside the honeycomb card.
The surfaces of the exterior walls are clad in zinc to act as rainwater protection, with zinc guttering the rainwater which gets collected from the overhanging roof panels.