Concrete sideform system

A composite concrete sideform system comprising:

• a substantially rigid longitudinally extending wall, the wall having a first front face to define an end profile of a concrete panel to be poured onto a casting bed bounded by the wall and a second rear face opposite the first front face having at least one of a slot and a rail located in spaced relationship relative to a lower edge of the wall, and adapted for positive engagement by one of a bolt, uni-bolt, plate with threaded lugs and magnetic fastener to secure the wall to the casting bed,
• a longitudinally extending insert formed of a resilient flexible material comprising:
• an edge profile to impart a shape to an edge of a concrete panel to be cast using the sideform system;
• and
• an attaching member,
• wherein the wall comprises a longitudinally extending frame having at least one receiving formation along at least one of its upper or lower edges arranged to removably receive the attaching element of the longitudinally extending insert to impart a shape to a correspondingly upper or lower edge of the concrete panel to be cast, and
• wherein the receiving formation is arranged to retain the insert in a position such that the insert is interchangeable with other inserts independent of a shape imparted to the other of the upper or lower edges of the concrete panel to be cast.