The NSRP or National Selective Remediation Protocol specifies the removal of corrosive drywall based on the amount and location of the corrosive drywall in the home. National requires a rigorous inspection to determine the location of the corrosive drywall within the home. The inspection and scope of work are reviewed by National and, if approved, qualify the home for repairs just to the effected areas of the home. Once these repairs are completed National will issue a warranty up to $500000 against the presence of corrosive drywall.