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Survey report: control technology evaluation for controlling worker exposure to asphalt fumes from roofing kettles: kettle operated using an afterburner system at Nicholes Elementary School, San Antonio, Texas, report no. CT-231-20a.

Marlow-DA; Topmiller-JL
NIOSH 2004 Mar; :1-20
From November 26 through December 1, 2001, a field survey was conducted at a new construction site where a built up asphalt roof was being installed at Nicholes Elementary School in San Antonio, Texas. The survey was conducted to evaluate the effectiveness of using an afterburner system with a safety loading door fitted to an asphalt kettle to reduce worker exposure to asphalt fumes. Personal breathing zone and area air samples were collected and analyzed for total particulate (TP), benzene soluble fraction (BSF) of the TP, and total polycyclic aromatic compounds (PAC). These three analyses were chosen to represent indices of exposure to asphalt fumes. Air samples were collected with the afterburners on and kettle lid closed and the afterburners off and kettle lid closed. Air samples were collected on the kettle operator, two roof level workers, and area air samples collected around the four comers of the kettle. Four days of sampling were conducted at Nicholes Elementary School. Due to a laboratory error, two days of sampling were lost. The kettle operator's exposures to TP, BSF, and total PAC were all increased when the afterburner was on and the kettle lid was closed when compared to when the afterburner was off and the kettle lid was closed. Increases in exposures for the kettle operator of 147%, 397%, and 367% for TP, BSF, and total PAC were measured. The comparison of the results for the area air samples collected around the kettle showed a reduction of 41 % for the TP exposures and an increase of 81 % and 95% for BSF and total PAC. For the roof leve1 workers, exposures to TP, BSF, and total PAC were reduced 48%, 46%, and 57%, respectively. None of the reductions measured were statistically significant (p less than or equal to 0.05). Using the afterburner system with the kettle lid closed did not appear to provide protection from asphalt fume exposure, particularly for the kettle operator.
Construction-materials; Construction-workers; Control-technology; Asphalt-fumes; Air-sampling; Exposure-assessment; Exposure-levels; Particulates; Benzenes; Polycyclic-aromatic-hydrocarbons; Region-6; Roofers; Breathing-zone
National Institute for Occupational Safety and Health, Division of Applied Research and Technology, Mail stop R-5, 4676 Columbia Parkway, Cincinnati, OH 45226
71-43-2; 8052-42-4
Publication Date
Document Type
Field Studies; Control Technology
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Fiscal Year
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Identifying No.
NIOSH Division
Priority Area
Research Tools and Approaches: Control Technology and Personal Protective Equipment
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Source Name
National Institute for Occupational Safety and Health