Over 500 million pounds of drywall were imported from China between 2004 and 2007 when the construction boom was at a peak and domestic materials in short supply, with demand exacerbated by the reconstruction programs that followed hurricanes Katrina and Wilma. Laboratory tests carried out for Florida's Department of Health showed that samples of Chinese-made drywall contained strontium sulfide, which gives a rotten egg odor when moistened and reacts with hydrogen in the air to take on corrosive powers capable of eating through metals and electrical wires."
So why can't this be covered under insurance? Well, first it is a manufacturer defect. Second, tainted drywall is not a covered peril but since it is new problem it also is not an exclusion. That could pose a problem and insurance companies are currently at a loss as how to handle the cases.

