A hem bar for use with an architectural-structure covering such as, for example, a rollable screen (e.g., an outdoor insect screen, a solar screen, a hurricane screen, a privacy and security screen, etc.). The hem bar includes a weather strip for contacting or resting on a contacting surface when the covering is in a fully extended position. The weather strip is vertically, movably positioned relative to the hem bar. Additionally, the weather strip may be downwardly biased relative to the hem bar. The hem bar may also include a plurality of weight-receiving chambers for receiving, for example, a weighted rod, a weighted bar, or the like to assist in maintaining the covering in a taut condition (e.g., assists with maintaining constant tension on the covering) in the extended position. The hem bar may have a symmetrical design to eliminate any tilting or rocking motion.