Farm buildings and homes in Co Donegal are “crumbling” as a result of defective blocks used in their construction, after the mineral muscovite mica was discovered in the blocks a number of years ago.

Irish Natura and Hill Farmers Association (INHFA) spokesperson Henry O’Donnell said: “A large number of houses and farm buildings are now crumbling, leaving their owners facing the prospect of a huge repair bill due to the inadequacies of the current redress scheme.