A two-piece reinforcement assembly and method for producing the same are provided. The two-piece reinforcement units include first and second half-members, preformed from respective single pieces of material. Assembled two-piece reinforcement units have half-members which are inverted and bonded together. Each of the two-piece reinforcement units includes at least one chamber defined by the bonded half-members. The reinforcement units further include a base portion and an offset portion which are connected by intersection portions on opposing ends of an angular portion. The half-members are bonded at their respective base portions. Each half-member further includes an end portion, which may be substantially perpendicular to the base portion. Further embodiments may include indentations in one of the intersections of the angular portion, and may be tapered along the angular portion from the base portion to the offset portion.