Patent ID: 8833040

Claim:
An elongate profile element comprising: a bottom; sidewalls extending from the bottom; and an upper side opposite the bottom; wherein the upper side comprises upper flanges that extend from respective sidewalls towards each other and that delimit between the upper flanges an upper side longitudinal slot extending over the length of the profile element, each upper flange having an upper flange inwardly bent end portion terminating in an upper flange edge facing the bottom; wherein the bottom is provided with at least two bottom slots each having a longitudinal axis that is parallel to the upper side longitudinal slot, each at least two bottom slots having bottom longitudinal sides, each bottom longitudinal side defined by a bottom flange extending from the bottom longitudinal side, each bottom flange having a bottom flange inwardly bent end portion terminating in a bottom flange edge facing the upper side, each at least two bottom slots being spaced apart from an adjacent bottom slot by a connection web defining straight transverse edges of the at least two bottom slots; wherein the upper side longitudinal slot and the at least two bottom slots have the same width; and wherein the distance between the sidewalls extending from the bottom exceeds the width of the longitudinal slot and the at least two bottom slots.