What is Fire Resistance Rating (FRR)?
The term FRR is short for Fire Resistance Rating and comes directly from the New Zealand Building Code (NZBC) or the National Construction Code (NCC). It is defined as a grading period in minutes determined in accordance with Schedule 5 for the following criteria.
- Structural Adequacy
In easier terms, if there is a fire, the building code sets out how long a particular building element will last:
(a) stay up (Structural Adequacy)
(b) not let any fire or hot gasses through (Integrity) and
(c) stop heat from passing through (Insulation).
Each of these criteria is measured during a fire test, and the failure criteria are set out in the fire test standard AS1530.4.