Historical clue formulations

• Widely banned building material — 2019-10-24
• Once-common building material — 2017-03-17
• Frowned-upon construction material — 2016-04-23
• Old construction danger — 2011-04-22
• Litigation-prompting insulation — 2009-11-25
• Litigation-prompting mineral — 2006-07-15
• Danger in old homes — 2004-07-01
• Workplace watchdog's concern — 2002-12-01