b'proposed variation would require the roof tested in FSZ 2411 with the valley gutter to be configured and tested in this way.Whentheroofistestedatalowerpitch,itisgenerallylesssevereastheincidentradiationis significantly reduced per meter square of room.With reference to AS 1530.8.1-2018 clause 17.4.1, it stipulates that when a roof is tested with a pitch of 18 degrees, aside from the cribs required for a roof tested with a pitch of 45 degrees, it shall have an additional crib over a joint at 750mm from the facia. It was observed that in FSZ 2411, there was no crib place at the joint in the roof panel system at 750mm from the facia. The joint can be a location of weakness where the heat of the crib can penetrate through the panel, leading to flaming or insulation failure at the back of the panel. However, it is observed that the tested panel profile and the proposed panel profile both has a small section of metal sheet which overlaps at the panel joint, which allow this joint to in a similar heating condition as the rest of the panel. Furthermore, the back of the joint would be sealed with silicon sealantastestedinFSZ2411whichwouldfurtherpreventheatofthecribfromcausingthe thermocouple required at the joint to reach insulation failure. Based on the above, it is expected that if the roof tested in FSZ 2411 was tested at 18 degree pitch, it will also meet the requirements of BAL 29. 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. Roof panel top steel skin and panel thickness variation The proposed construction includes the roof panel top steel skin varied from the tested DeltaTrim roof as shown in Figures 4 and 5, profile to DeltaOrb roof profile as shown in Figures 1-3. The panel shall be a minimum of 100mm thick as per Figures 2 and 4. With reference to FSZ 2411, DeltaTrim panels were installed on top of the roof frame with a Trimdeck profile. Throughout the test, the profile of top steel skin of the panel did not contribute to flaming or caused gaps to form. It is also confirmed that the panel joints are of the same design with the same kind of profiled metal sheeting overlap at the joint. It is expected that the proposed alternative steel skin profile will also function in the same manner as the tested skin, and not cause flaming or caused gaps to form for the duration of the test. It is observed that the thickness of the proposed DeltaOrb panel discounting the curved section of the panel, is at least 100mm, which is the same as that tested in FSZ 2411. The additional thermosetting phenolic composite core (TPC) in the curved section of the panel is expected to absorb more heat than the empty profile of the DeltaTrim panels.It is also expected that the increase in the base panel thickness discounting the curved/trapezed section of the panel, would also improve the panels overall 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 of panel to panel fixingThe proposed construction includes following panel to panel fixing variations as follows: The fixing shall be the tested 13g x 25mm self-drilling steel screws, or larger/longer in size. The fixing shall be at least 200mm centres or closer With reference to FSZ 5411, the bottom edge of the DeltaTrim-TPC panels were protected with profiled 1.2-mm thick roll formed steel skin DeltaTrim Fascia flashing (TPC-003) fixed with 13g x 25-mm self-drilling steel screws at 200-mm centres. The fixings held the panels together and did not allow for gap formation during the test.FCO-3545 Page 13 of 16 Copyright CSIRO 2024 This report may only be reproduced in full. Alteration of this report without written authorisation from CSIRO is forbidden.'