Dec. 7, 2009: Study Links Imported Drywall to Corrosion in Homes, Including HVAC Coil Corrosion
The five-month EH&E study included 51 homes in five southern states: 41 homes where property owners had reported corrosion of wiring or piping, and 10 similar homes about which no complaints had been filed. The following findings were presented by John F. McCarthy, Sc.D., C.I.H., president of EH&E, in a congressional briefing:
• In homes with suspect drywall, the following conditions were determined:
- High rates of sulfur-based corrosion on copper and silver test coupons.
- Visible corrosion of copper wires in electrical outlets.
- Low level concentrations of hydrogen sulfide gas.
- Low ventilation rates.
- Associations of corrosion with hydrogen sulfide concentrations in air, temperature and humidity.
• A reliable real-time method of “fingerprinting” suspect drywall using state-of-the-art inspection equipment was developed and validated.
The EH&E presentation to Congress and a report prepared for the Consumer Product Safety Commission (CPSC) are available at www.eheinc.com/cpsc_drywall.htm.
Publication date: 12/07/2009