Handheld Grinding, Cutting, and Tuckpointing
Table 1 - SPECIFIED EXPOSURE CONTROL METHODS WHEN WORKING WITH MATERIALS CONTAINING CRYSTALLINE SILICA
| Required Respiratory Protection and Minimum Assigned Protection Factor (AFP) | |||
|---|---|---|---|
| Equipment/Task | Engineering and Work Practice Control Methods | ≤ 4 hours/shift | > 4 hours/shift |
| Handheld Power Saws for Cutting Fiber-Cement Board (with blade diameter of 8 inches or less) | Use saw equipped with integrated water delivery system that continuously feeds water to the blade. Operate and maintain tool in accordance with manufacturer’s instructions to minimize dust emissions. | None | None |
| Handheld Grinders for Mortar Removal (i.e., tuckpointing) | Use saw equipped with integrated water delivery system that continuously feeds water to the blade. Operate and maintain tool in accordance with manufacturer’s instructions to minimize dust emissions. | AFP 10 | AFP 25 |
| Handheld Grinders for Uses Other than Mortar Removal | Use grinder equipped with commercially available shroud and dust collection system. Operate and maintain tool in accordance with manufacturer’s instructions to minimize dust emissions. Dust collector must provide 25 cubic feet per minute (cfm) or greater of airflow per inch of wheel diameter and have a filter with 99% or greater efficiency and a cyclonic pre-separator or filter-cleaning mechanism. | ||
| When used outdoors | None | None | |
| When used indoors or in an enclosed area | None | APF 10 | |