Federal authorities are expanding their investigation of tainted Chinese drywall to include U.S.-manufactured drywall, in response to complaints from homeowners with domestic drywall in their homes.

Tainted Chinese drywall emits sulfur-like fumes that have been linked to corrosion of metal components and health complaints. Some homeowners with such complaints, however, have since discovered that their homes were built with domestic drywall. Lawsuits have recently been filed against domestic drywall manufacturers National Gypsum and Georgia Pacific for such problems.

Nevertheless, the great majority of complaints received to date from the Consumer Products Safety Commission involve problems caused by Chinese drywall; of approximately 2,100 complaints, only about 25 are from homeowners reporting American-made drywall.

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