b'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 sealantThe 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.FCO-3545 Page 15 of 16 Copyright CSIRO 2024 This report may only be reproduced in full. Alteration of this report without written authorisation from CSIRO is forbidden.'