FCO-3545  
 
 
 
 
 
 
 
   
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Variation to mineral wool density 
The proposed construction includes mineral wool under the valley gutter which may be as tested 
50mm or thicker, with a minimum density of 38kg/m2 .  
With reference to FSZ 2411, the valley gutter consisted of a 50-mm thick x 150-mm wide mineral wool 
core with a stated density of 38-42 kg/m3 covered on the top side with a 30-mm x 50-mm 150-mm 
wide x 0.6-mm thick roll formed steel skin (TPC-R005) fixed with Tex screws at 200-mm centres.  
Throughout the test, the mineral wool under the metal valley gutter did not contribute to flaming or 
caused gaps to form. It is expected that the increase in density of the mineral wool will improve the 
insulation performance. 
Based on the above, it is expected that the proposed construction will not detrimentally affect the 
performance of the tested roof system when tested in accordance with AS 1530.8.1-2018. 
Variation to sealant  
The proposed construction includes following sealants in all gaps including roof ribbing edges, joints 
on the upper and underside of the roof panel, valley gutter, barges, ridge, hips, and drip edges. 
• 
Boss FireSilicone-EMA sealant (as tested) or other fire-resistant silicone sealants such as Sikasil 
670 Fire Silicone Sealant. 
With reference to FSZ 2411, the exposed roof ribbing edges were covered with Delta TrimEnd Caps 
(TPC-R015) that were fully sealed with Boss FireSilicone-EMA sealant. All the joints on the upper and 
underside of the roof panel were filled with a bead of FireSilicone-EMA sealant. When exposed to BAL 
29 radiation, the sealants did not cause flaming for the duration of the test. The upper side sealants 
where were exposed directly to the crib and also radiant heat, and did not get involved in the burning 
behaviour of the specimen when tested. This demonstrates that silicone based sealants would not 
cause flaming or gap formation for the test duration. 
The proposed sealants are all fire-resistant silicone-based sealant and, in that way, similar to the tested 
sealant. 
Based on the above, it is expected that the proposed construction will not detrimentally affect the 
performance of the tested roof system when tested in accordance with AS 1530.8.1-2018. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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