FCO-3545  
 
 
 
 
 
 
 
   
                                           Page 11 of 16 
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Orientation 
The roof specimen was tested with the exterior face of the roof exposed to the radiant heat source. 
Crib size 
The crib size selected by the test sponsor for the relevant BAL level was Class AA, as specified in Table 
3.2 of Section 3.8 of AS 3959:2018. 
Four cribs were used for the test, crib #1 was positioned in the roof gutter adjacent to the ridge edge 
of the valley gutter, while Cribs #2 and 3 were positioned in the valley gutter 700-mm and 1200-mm 
from the drip edge. Crib # 4 was positioned just below the ridge cap detail mid span. 
Performance observed in respect of Clause 14.4 of AS 1530.8.1-2018 criteria: 
Performance Criteria 
Time to failure (min) 
Position of failure 
A gap from the fire exposed face to the non-fire 
exposed face greater than 3mm 
No Failure 
- 
Sustained flaming for 10 seconds on the non-fire side 
No failure 
- 
Flaming on the fire-exposed side at the end of the 60 
minutes test period 
No failure 
- 
Radiant heat flux 365mm from the non-fire side 
exceeding 15-kW/m² 
Not Applicable 
- 
Mean and maximum temperature rises greater than 
140 K and 180 K 
No failure 
- 
Radiant heat flux 250mm from the specimen, greater 
than 3-kW/m² between 20 minutes and 60 minutes 
No failure 
- 
Mean and maximum temperature of internal faces 
exceeding 250°C and 300°C respectively between 20 
minutes and 60 minutes after the commencement of 
the test 
Not Applicable 
- 
Crib class 
AA 
Peak heat flux 
29 kW/m² 
 
For the purpose of building regulations in Australia, the test specimen achieved a Bushfire Attack Level 
(BAL) of AA29. 

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