What factors form the fire resistance level of a door?
Fire-resistant doors are one of the most important safety features of any building, and doors go through rigorous testing to receive a certified fire resistance level.
So what important factors form a door’s level of fire resistance? Read on to find out.
The National Construction Code of Australia states that doors that are to be used for fire-resistant purposes must be tested to specifications AS1530.4, to make sure that they meet the correct standards. After this, they are given a certification in the form of a ‘’fire resistance level’ (FRL) The Building Code of Australia declares that a Fire Resistance Level is graded by a period of minutes for three separate criteria these are:
Structural adequacy: Structural adequacy refers to a structures ability to hold its load bearing capacity when tested in accordance with the standards. The measure is failed when the element collapses or when the rate of deflection for the element exceeds limits as stated by AS1530.4.
Integrity: Integrity is a door’s capacity to resist flames as well as hot gases when tested in accordance with the appropriate standards. A fail is declared when flaming begins to be continuous on the non-exposed side of the door, or if cracks or other openings form.
Insulation: Insulation is a measure of a door’s ability to maintain a low temperature on the side of the door not exposed to flames. This temperature is determined by the standards stated in AS1530.4 and failure ensures when the temperature of the non-exposed side raises above the predetermined threshold.
The above criteria are tested to the Australian standard AS1530.4, which measures methods for fire tests on building materials, components and structures. The time it takes, recorded in minutes before a failure in each of these categories makes up the score of the FRL. For example, if a door is required to maintain an FRL of 90/30/60, it means the test requires structural adequacy for 60 minutes, integrity for 90 minutes and insulation for 60 minutes, tested by the standards dictated in AS1530.4.
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