Congressman Charlie Melancon has filed a bill to block insurance companies from canceling homeowner insurance policies for people who discover their homes contain allegedly defective Chinese drywall.

Melancon also wants to stop insurers from changing rates based on problems stemming from Chinese drywall. He filed the bill Tuesday. About 1,900 homeowners, 318 in Louisiana, have filed Chinese drywall complaints with the Consumer Product Safety Commission.

Homeowners claim imported Chinese drywall emits sulfur, methane and other chemical compounds that have ruined homes and appliances and harm residents’ health.