A supporting structure (102) for a wall or a roof partition (104; 120) of a building structure (100), comprises an internal core structure (114) extending in a longitudinal direction, and first and second external covering profiles (106) for at least partially covering the core structure (114). The covering profiles (106) define inwardly and outwardly facing surfaces (108) facing one another, with slits (116) being formed at the inwardly facing surfaces (108). The core structure comprises at least two bands of material (114) which are mutually offset. The supporting structure (102) is suitable as a post, pillar, column, lath, batten, rafter, truss, girder, bar, or beam for a wall or roof partitions of a greenhouse, a cabin or shanty, a wall of a house, a stand-alone wall or roof partition, such as pent roof, a canopy, a fence, a windbreak or a solar panel structure The bands of material (114) are interconnected at their ends only and are pre-tensioned to provide stiffness, and may be configured to minimize their thermal conductivity.