The invention relates to a shuttering system for buliding construction and, particularly, auxiliary shuttering elements that are adapted to be used in conjuction with main shuttering elements of the shuttering system for forming extended shuttering walls, both the main shuttering elements and the auxiliary shuttering elements being of a synthetic plastic material. The auxiliary shuttering elements include primary auxiliary shuttering and secondary auxiliary shuttering elements, the primary elements including left hand and right hand elements for inter-engagement and locking together with the opposite sides of the main shuttering elements of the shuttering system. The configuration of the secondary auxiliary shuttering elements is variable and is determined by the configuration of special building formations to be provided for by the shuttering system, e.G. wall corners, door openings, window openings, or the like.
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