Rebar is one of the most important components in a concrete pier, as it helps to reinforce and strengthen the structure. The placement of rebar is critical since it will affect the stability and durability of the pier. Generally, rebar should be placed at regular intervals throughout the entire length of a concrete pier. The spacing between each piece depends on factors such as size, weight load, building code requirements, etc., but typically they are spaced 6-12 inches apart. Additionally, it’s best practice to stagger the rebar so that no two pieces overlap or touch each other; this ensures that maximum strength is achieved across all points along its length. When placing rebar in a concrete pier make sure you leave enough room for proper mixing and installation of mortar joints between adjacent bars; this will help ensure that your pier has adequate support from all sides when complete. Finally, always remember to use protective gear when handling sharp objects like metal rods and take extra care not to damage them during installation by bending or twisting them too much!