Opus mixtum (Latin: "mixed work"), or opus vagecum and opus compositum, was an ancient Roman construction technique. It can consist in a mix of opus reticulatum and at the angles and the sides of opus latericium. It can also consist of opus vittatum and opus testaceum. This masonry was used in the edges, so as to strengthen the side wall and contrasting the possible cracks along the oblique lines. Very used during the Flavians (from 70CE), under Trajan (98 - 117) and Hadrian (117 - 138).^[1][2]

• Opus caementicium – Building material used in ancient Rome
• Opus incertum – Ancient Roman masonry using irregular stones in a core of concrete
• Opus quadratum – Roman masonry using parallel courses of squared stone of the same height
• Opus reticulatum – Roman masonry in diamond-shaped bricks of tuff, covering a core of opus caementicium
• Jublains archeological site - the forum there is an example