What does the "R" in the fire rating of building materials represent?
- AResistance to thermal expansion
- BResistance to collapse (structural integrity)Correct
- CResistance to fire spreading
- DReflectivity of heat
Solution
Concept
Fire resistance
Step-by-step solution
1. In R-E-I fire rating, R stands for load bearing capacity (resistance to collapse).
Explanation
R = load-bearing capacity, E = integrity, I = insulation.
Why the other options are wrong
The other options are not what R represents.
Shortcut
R-E-I.
Correct answer: B) Resistance to collapse (structural integrity)