Defective Chinese imports
There are reports that a substantial amount of defective drywall was imported into the United States from China and incorporated into tens of thousands of homes during rebuilding in 2006 and 2007 following Hurricane Katrina and in other places. Complaints include foul odor, health effects, and corrosion of metal within the structure. The same drywall was sold in Asia without problems resulting, but U.S. homes built much more tightly than homes in China, with less ventilation. A number of lawsuits are underway in many jurisdictions, but many of the sheets of drywall are simply marked, "Made in China", thus making identification of the Chinese manufacturer difficult. An investigation by the Consumer Product Safety Commission, CPSC, was underway in 2009. In November 2009, the CPSC reported a "strong association" between Chinese drywall and corrosion of pipes and wires reported by thousands of homeowners in the United States. Further findings have shown that volatile sulfur compounds, including hydrogen sulfide, have been detected as emissions from the imported drywall and may be linked to health problems. Volatile sulfur compounds are emitted from many different types of drywall, and at least one investigation has pointed to high levels being emitted from drywalls manufactured in the United States.