Risk Assessment of Recycling Type X Drywall 

Project Description:   Gypsum drywall is a major component of construction and demolition (C&D) debris.  Recycling of drywall is desired, and one method of recycling is processing and application at the construction site.  A concern cited by some regarding job-site application of scrap drywall from commercial construction projects pertains to grinding of Type X drywall.  Type X drywall contains glass fibers to enhance fire resistance. Some have raised a concern that when processed (grinding and screening), the glass fibers would present an airborne health threat to workers and nearby residents. The industry on the other hand, contends that the fibers do not present a health threat. The objective of this study is to assess the potential human health hazard of selected airborne particulates from the grinding of Type X drywall. 

Status:   A demonstration grinding of type X drywall was conducted on February 19, 2004. Workers were equipped with sampling devices to collect airborne fiber, total dust, and respirable dust samples. See link for photos on the right. Currently, samples have been sent for analysis and are expected soon. 

Investigators:  Timothy G. Townsend (PI), Erik Spalvins (Graduate Research Assistant)

Sponsored by: US Environmental Protection Agency, Region 4