How can a home inspection expert witness help your client? The #3 problem that comes up in home inspections is roof damage. Ranked third, leaking roofs are a frequent problem. Home inspections expert witnesses can report and testify on old or damaged shingles or improper flashing and drainage. Home inspection expert witnesses can also testify on the 4th most common home inspection problem, heating systems. These expert witnesses can opine on broken or malfunctioning controls, blocked chimneys, and unsafe exhaust disposal.