When do you have to fireproof spray foam?

All spray foam (half pound and 2pound) must be protected by a thermal barrier in any area considered a living space (ceiling height over 5’11”), crawlspaces with a plenum (an enclosed space that moves air to living space), and crawlspaces with a heat source. The building code provides different options for achieving a 15 minute thermal break to keep ignition sources away from spray foam insulation (drywall, gypsum board, etc.).