A mineral wool insulating element comprises: a mineral wool blanket comprising mineral fibres; a first non-metallic mesh arranged at a first major surface of the mineral wool blanket; a second preferably non-metallic mesh arranged at a second major surface of the mineral wool blanket; and a plurality of fasteners arranged to connect the first and second non-metallic meshes together so as to retain the mineral wool blanket sandwiched between the first and the second meshes.
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