RESPONSE: Reinforcement sizes can vary within masonry walls. Reinforcement can be used as: a) joint reinforcement for crack control b) standard reinforcement bars to resist bending and shear forces according to the TMS 402/602 code. Bars can be #3 to #9 within walls designed with SD, or #3 to #11 within elements designed with ASD. The mason contractors prefer to use reinforcement bars #6 or smaller (based on recent survey), which is also important to take into consideration.