Given a gauge 25 (0.02" or 0.5mm) metal roof roll formed made from hot-dip galvanized cold rolled mild steel. How long can these thin metal roof melt in a typical house or office fire with typical fire load?
I read conflicting information. Some roof contractor said these thin gauge 25 metal sheet were so fireproof that during a fire, the firemen have to use saw to cut them to vent them. While other engineers say it has zero fire rating and can't last 2 minutes.
But if the metal sheet melting point is 1370°C (2500°F) and the fire tip is only 2500 degree Fahrenheit. Maybe it's that context where the fireman has to open it with saw to vent the fire?
In a typical fire with house or office items fire load. What temperature does it reach at the metal roof line?
If you can also show pictures of burned or melted metal roof, the better as I can't find a single one of them hence ignorance of it is rampant anywhere.