Removing old mortar with hand-held grinders while tuckpointing is among the dustiest of all construction jobs. Dust opacity often exceeds permissible exposures levels for the mason doing the work. In addition, safety experts have warned contractors that the grinding task puts workers at grave risk of encountering an even more dangerous dust-related problem, such as respirable crystalline silica. Given the magnitude of the silica hazard and the urgent need to protect tuckpointing workers, the Center to Protect Workers’ Rights (CPWR) funded a study to develop an economical manner to mitigate dust exposure.