Structural protection · Thickness design
How is the required thickness of steel fire protection determined?
Short answer
Required thickness comes from the system's test or assessment evidence read against the member and the design requirement. There is no universal table, and any figure published without its system and conditions is misleading.
What to do next
Send the tag, the schedule reference, the drawings you have and photographs of the actual condition. We will tell you what they show, what they cannot, and what else is needed before anyone gives a conclusion.
General information only. A conclusion about a specific condition requires the actual construction, the evidence behind it and the site condition to be reviewed.