Homeowners who claim problems with defective drywall have until Dec. 2 to file papers for a national class action against Knauf Plasterboard Tianjin.

Owners who meet that deadline for filing a claim with proof of Knauf drywall will be covered by a lawsuit to be filed Dec. 9 by lead plaintiff counsel Arnold Levin of Levin Fishbein Sedran & Berman of Philadelphia in New Orleans federal court. Knauf has agreed to waive formal service of the complaint under the Hague Convention.