A generic term for sheet metal? Comes in many forms. Try putting Λαμαρίνα into google.gr This is a Wikipedia article
on it. e-metalshop
sell it in Greece. I've mostly seen it used for roofing. There are plenty of places around Chania that sell it, e.g. Sidal on Kissamou on the right hand side going into Chania not far before the square with a statue of a woman and child where Mark Botsarin branches off. Some of it is double layer with polyurethane insulation between the layers. I've seen store rooms built with steel studding clad in plasterboard and then rendered.