Structure and construction method

A structure comprising:

• a core wall structure comprising elements of lightweight thermal insulation material and rigid mineral boards, said core wall structure having two opposing outer surfaces and at least some of said rigid mineral boards being positioned between the elements of lightweight material at spaced intervals to extend transversely across the core wall structure, with opposing edges of the mineral boards being exposed on the opposing outer surfaces of the core wall structure;
• and
• skins of cement-based plaster extending on the opposing outer surfaces of the core wall structure to cover opposing sides of core wall structure at least in part;
• wherein the exposed edges of the mineral boards are embedded at least in part in the skins of cement-based plaster on the opposing sides of the core wall structure, each of the mineral boards forming a rigid structural connection between the opposing skins of cement-based plaster wherein edges of the elements of lightweight thermal insulation material are recessed adjacent the exposed edges of the mineral boards, to provide space for the reinforcement of the skins of cement-based plaster.