FCO-3545
Page 13 of 16
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proposed variation would require the roof tested in FSZ 2411 with the valley gutter to be configured
and tested in this way.
When the roof is tested at a lower pitch, it is generally less severe as the incident radiation is
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
sealant as tested in FSZ 2411 which would further prevent heat of the crib from causing the
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 panel’s 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 fixing
The 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.
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