building roof top made of burnt wooden boards. sho-sugi-ban yakisugi is a traditional japanese method of wood preservation

aged ash ban black board boards building burned burnt carbon charred charring coal conflagration construction decor design ecological exterior facade finish fire firewood floor grunge handmade home interior japan japanese made material method natural old preservation preserve processing rain roof sho shosugiban shou style sugi surface technology texture traditional tree wall windows wood wooden yakisugi