BLOCK DOES NOT BURN
Photo above is a concrete block home, the only remaining building in the entire neighborhood (being sensitive to the current situation, this was taken from an older California fire).
The photo at left shows a metal stud wall only seconds into a fire test (Hose Stream). The short video clip can be viewed here. Metal studs are more fire retardant than wood studs so a wood stud wall would perform significantly worse than what the metal stud wall did in this video.
The concrete block wall at left after the same Hose Stream fire test. The wall remained intact and completely structural. View the test here. Omni Block’s System 12 is fire-rated at 4 hours and the System 8 is fire-rated at 2.7 hours.
The actual test results for Omni Block walls is available at Fire Testing.