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In-depth survey report of a local exhaust ventilation device for suppressing respirable and crystalline silica dust from powered saws at Revelation Roofing, Denver, Colorado.

Garcia A; Jones E; Echt A; Hall R
Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, EPHB 317-12a, 2006 May; :1-24
The objective of this study was to quantify the respirable dust and respirable silica exposures of roofing workers using an electric powered saw with an aftermarket local exhaust ventilation attachment. The study was conducted to determine whether the local exhaust ventilation attachment was able to control respirable dust and respirable silica exposure below occupational exposure limits. Sampling was conducted at three different sites near Denver, CO. Time integrated filter samples and direct reading respirable dust concentrations were evaluated. Respirable dust from the trials ranged from 0.13 to 6.59 mg/m3 with an average of 0.84 mg/m3 for roofers and from 0.45 to 3.82 mg/m3 with an average of 2.01 mg/m3 for cutters/roofers. The respirable dust exposures for all cutters/roofers indicated concentrations exceeding the OSHA PEL; it was also exceeded for some of the roofers. The respirable silica concentrations ranged from 0.04 to 0.15 mg/m3 with an average of 0.09 mg/m3 for roofers, and from 0.13 to 1.21 mg/m3 with an average of 0.48 mg/m3 for cutters/roofers. As with respirable dust, the respirable silica exposures to cutters/roofers were higher than the exposures for roofers. In general, higher respirable dust and respirable silica exposures were observed for the saw operators than for other roofers. However, all workers were overexposed to respirable dust and respirable silica for at least one monitored shift. The use of the engineering control alone is not sufficient for reducing exposures below acceptable occupational exposure levels. Redesign options for the control should be considered. In the meantime, work practice modifications, administrative controls, and a comprehensive respiratory protection program should be implemented in order to control respirable dust and respirable silica exposures.
Region-8; Silica-dusts; Respirable-dust; Roofing-industry; Roofing-and-sheet-metal-work; Exhaust-ventilation; Control-technology; Engineering-controls; Power-tools
Publication Date
Document Type
Field Studies; Control Technology
Funding Type
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
NIOSH Division
Priority Area
Research Tools and Approaches: Control Technology and Personal Protective Equipment
Source Name
National Institute for Occupational Safety and Health