For buildings and building systems, distinguishing between damage caused by the incident and pre-existing damage may be difficult. Before making an eligibility determination, FEMA considers each of the following:

• The age of the building and building systems
• Evidence of regular maintenance or pre-existing issues, such as water damage from a leaky roof
• The severity and impacts of the incident

Mold remediation and removal of mud, silt, or other accumulated debris is eligible as Permanent Work when conducted in conjunction with restoration of the facility.