The invention relates to a truss (1) for forming a light construction building, said truss (1) comprising vertical posts (2,3,4) arranged in at least two base rows (L1,L2), and a couple roof (8) formed by rafters (6), binding beams (6a), purlins (7a) and a purlin ridge (7) is fixed to the vertical posts (2,3,4); and a bracing member arranged between at least two, first and second adjacent vertical posts (3,4) is connected said posts (3,4) in each row (L1.L2), and the bracing member is connected to the upper section of the first post (3) at its first end, and the bracing member is connected to the lower section of the second post (4) at its second end, the bracing member is a bracket bar (10) to be loaded equally by compression and tensile forces, wherein a further bracket bar (11) to be loaded equally by compression and tensile forces is arranged between the first vertical post (3) and the adjacent third vertical post (5) in each row (L1.L2), the bracing member (11) is connected to the upper section of the fi
