This revised edition of Patrick Seguin's 2013 volume on Jean Prouv�'s Maison D�montable 8x8 Demountable House includes new images and layout. In 1938, continuing his research into demountable houses, Prouv� came up with the structural principle of the axial portal frame, which he patented the following year. He applied it to his government-commissioned eight-meter modules, documented here.