Asphalt shingles are the most common roofing material used on homes across the country, and thousands of them are replaced daily. Proper installation is critical. This webinar will explore ways that home inspectors can perform thorough inspections and look for installation defects according to the IRC and the manufacturer’s instructions. Glenn Mathewson has published his own column, “Know the Code,” in Fine Homebuilding magazine since 2018. He is the president of www.BuildingCodeCollege.com.