The £7m building project specified steel sheets in the original plans but concerns were soon raised about the potential reverberation and noise from wind, heavy rain and hail causing distress to the animals. In addition to this, the steel sheets would also have been susceptible to corrosion; caused by heat and moisture from the animals’ slightly acidic breath condensing on the relatively cooler underside of the roof. In place of the steel sheets, Eternit fibre cement Profile 6 sheets were chosen.