The composite slab profile (1) is used as built-in shuttering for concrete floors. The profile has a main plane. Mutually parallel, trapezoidal profile depressions (2) run out of this plane in the direction of the space to be filled with concrete. Folds (3) are provided in the main plane between the profile depressions (2), said folds running parallel to the depressions, jutting out in the same direction, and being bent from the same metal sheet, as the depressions. The walls of said folds are perpendicular to the main plane of the profile and exhibit bonding indentations (4). These bonding indentations (4) are depressions which are pressed down, in the direction of the main plane, from the free edge of the folds (3). IMAGE
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