BRE Global Test Report

Transcription

1 BRE Global Test Report BS : A1:2017 test on ventilated façade system with Kingspan (K15) thermal insulation and ACM panels Prepared for: Date: 18 January 2017 Mitsubishi Chemical Corporation Report Number: P Issue: 1.0 BRE Global Ltd Watford, Herts WD25 9XX Customer Services Prepared for: Mitsubishi Chemical Corporation 1-1, Manurouchi 1-chrome Chiyoda-ku Tokyo , Japan Commercial in Confidence BRE Global Ltd 2018 Page 1 of 46

2 Prepared by Name Octavian Lalu Position Fire Safety Scientist Date 18 January 2018 Signature Authorised by Name Stephen Howard Position Director of Fire Testing and Certification Date 18 January 2018 Signature This report is made on behalf of BRE Global and may only be distributed in its entirety, without amendment, and with attribution to BRE Global Ltd to the extent permitted by the terms and conditions of the contract. Test results relate only to the specimens tested. BRE Global has no responsibility for the design, materials, workmanship or performance of the product or specimens tested. This report does not constitute an approval, certification or endorsement of the product tested and no such claims should be made on websites, marketing materials, etc. Any reference to the results contained in this report should be accompanied by a copy of the full report, or a link to a copy of the full report. BRE Global s liability in respect of this report and reliance thereupon shall be as per the terms and conditions of contract with the client and BRE Global shall have no liability to third parties to the extent permitted in law. Opinions and interpretations expressed herein are outside the scope of UKAS Accreditation. Commercial in Confidence BRE Global Ltd 2018 Page 1 of 46

3 Table of Contents 1 Introduction 3 2 Details of test carried out 4 3 Details of test apparatus used 5 4 Description of the System Summary Description of product Installation sequence Conditioning of the specimen 9 5 Test results Test Conditions Temperature Profiles Visual Observations 11 6 Post-test damage report ACM ALPOLIC/A2 panels Aluminium rail substructure Thermal insulation (Kingspan K15) 14 7 Conclusion 15 8 Reference 16 9 Figures Diagrams of finished face of the cladding system Installation photographs System drawings Temperature data Post-test photographs 36 Commercial in Confidence BRE Global Ltd 2018 Page 2 of 46

4 1 Introduction The test method, BS8414 Part 1: A1:2017 [1] describes a method of assessing the behaviour of non-load bearing external cladding systems, rain screen over cladding systems and external wall insulation systems when applied to the face of a building and exposed to an external fire under controlled conditions. The fire exposure is representative of an external fire source or a fully developed (postflashover) fire in a room, venting through an opening such as a window aperture that exposes the cladding to the effects of external flames. The specification and interpretation of fire test methods is the subject of on-going development and refinement. Changes in associated legislation may also occur. For these reasons it is recommended that the relevance of test reports over 5 years old should be considered by the user. The laboratory that issued the report will be able to offer, on behalf of the legal owner, a review of the procedures adopted for a particular test to ensure that they are consistent with current practices, and if required may endorse the test report. BRE was not involved in the design, installation, procurement or specification of the materials and cladding system that was submitted for testing. The tested system was defined by the Test Sponsor. All measurements quoted in this report are nominal unless stated otherwise. Commercial in Confidence BRE Global Ltd 2018 Page 3 of 46

5 2 Details of test carried out Name of Laboratory: Laboratory Address: BRE Global Ltd. Bucknalls Lane, Garston, Watford, Hertfordshire. WD25 9XX Test reference: P Date of test: 9 th October 2017 Sponsor: Sponsor address: Mitsubishi Chemical Corporation 1-1, Manurouchi 1-chrome, Chiyoda-ku, Tokyo , Japan Method: The test was carried out in accordance with BS : A1:2017 Deviations: None Commercial in Confidence BRE Global Ltd 2018 Page 4 of 46

6 3 Details of test apparatus used The product was installed on to wall number 1 of the BS [1] BRE Global test facility. This apparatus is representative of the face of a building and consists of a masonry structure with a vertical main test wall and a vertical return wall at a 90º angle to and at one side of the main test wall. See Figure 1. The main wall includes the combustion chamber. Commercial in Confidence BRE Global Ltd 2018 Page 5 of 46

7 4 Description of the System 4.1 Summary Generic cladding type Rainscreen Relevant test method BS Substrate Masonry Insulation 100mm-thick phenolic foam K15 insulation boards Cavity depth 50mm Vertical cavity barriers 75mm-wide 160mm-deep stone wool vertical cavity barriers with 10mm compression (Siderise RSV90/30) Horizontal cavity barriers 75mm-wide 125mm-deep stone wool with intumescent horizontal cavity barriers (Siderise RH25G90/30) External finish 4mm-thick front face Aluminum Composite Material (ACM) panels () ALPOLIC/A2, with a grey finish Commercial in Confidence BRE Global Ltd 2018 Page 6 of 46

8 4.2 Description of product Table 1. List of components parts used in construction system Item Description 1 90mm-high 64mm-wide 113-deep 4mm-thick aluminium L shaped brackets fixed with a single 90mm-long ϕ8mm stainless steel screw anchor with plastic plug 2 100mm-thick phenolic foam type K15 insulation boards, with aluminium faces on both sides 3 120mm-wide 60mm-deep 2mm-thick aluminum T -section framing and 40mm-wide 60mmdeep 2mm-thick aluminum L -section framing 4 75mm-wide 160mm-deep stone wool vertical cavity barriers with 10mm compression (Siderise RSV90/30 labeled Lamatherm ) 5 75mm-wide 125mm-deep stone wool with intumescent horizontal cavity barriers (Siderise RH25G90/30 labeled Lamatherm ) 6 4mm-thick ACM (aluminium composite material) panels (). ALPOLIC/A2. The mean calorific value measured for the core was MJ/Kg. BRE Report P [2]. 4.3 Installation sequence Onto the masonry support structure, the aluminium L -shaped brackets were fixed in position on low density polyethylene isolation pads (5mm-thick) using a single stainless steel screw anchor and plastic plug. On the main face, the horizontal spacing between the brackets varied between 340mm and 500mm and on the wing wall the spacing between the brackets was 645mm as specified in the manufacturer s details. The vertical spacing between the brackets was 960mm and where horizontal cavity barriers were present a spacing of 410mm was used. The system included vertical and horizontal cavity barriers. On the main face, two 75mm-wide 160mmdeep stone wool vertical cavity barriers, with 10mm compression, were fixed in position either side of the combustion chamber opening with a clear distance of 2100mm between them. The vertical cavity barriers were skewered to ¾-depth on steel brackets fixed into the masonry wall with one 70mm-long ϕ4mm anchor. Two steel brackets were used for each length of 1200mm of stone wool cavity barrier. On the wing wall, one 75mm-wide 160mm-deep stone wool vertical cavity barrier, with 10mm compression, was fixed in position at the edge of the system, approximately 1340mm from the external face of the main wall. Once installed in position the stone wool vertical cavity barriers were compressed by the ACM panels to fully close the 50mm ventilated cavity. Commercial in Confidence BRE Global Ltd 2018 Page 7 of 46

9 A set of four 75mm-wide 125mm-deep intumescent horizontal cavity barriers were butted up to the continuous vertical barriers and fixed in rows at approximate heights of: 0mm above the combustion chamber opening; 2320mm above the first cavity barrier; 2360mm above the second cavity barrier; 1560mm above the third cavity barrier (close to the top of the ventilated system). The horizontal cavity barriers were fixed through the entire depth on face turned steel brackets. Two steel brackets were used per 1200mm length of stone wool cavity barrier, each fixed into the masonry wall with one 70mm-long ϕ4mm anchor, positioned above the cavity barrier. The horizontal intumescent cavity barriers were installed with a maximum gap of 25mm to the back face of the panel in accordance with the manufacturer s recommendation. The 100mm-thick foil-faced Kingspan K15 phenolic insulation panels (supplied in 2400mm 1200mm panels and cut to fit) were installed in position through the substructure bracket fixing systems and fixed to the support structure (masonry wall) with five 125mm-long ϕ8mm plastic anchors and four 140mmlong ϕ8mm stainless steel anchors per full size panel. The insulation panels were installed with the long edge orientated horizontally. All the gaps between the insulation panels and at the intersection with the cavity barriers or aluminium brackets were sealed with aluminium tape as recommended by the manufacturer. After the insulation was fixed in position the L -section framing was installed at horizontal spacings of 470mm. The horizontal spacing between successive sections of aluminium T -section or L -section framing was 970mm. The aluminum vertical rails, with a typical length of 2300mm, were positioned 10mm inside the thermal insulation with each rail fixed to the brackets with mm self-drilling, selftapping, stainless steel screws. The aluminum rails were installed with a 30mm gap at the floor levels to allow for structural movement. Three brackets supported each section of rail: the middle bracket was fixed while the top and bottom brackets were connected with movement holes. The external ACM panels () of the system were installed on to the rail substructure with one fixed point (ϕ6mm hole) in the middle and twenty (per full size panel) oversize (ϕ8.5mm holes) fixings into the rail substructure, at 450mm horizontal spacings and 375mm vertical spacings. A nominal gap of 20mm was provided between the panels to maintain the ventilation of the cavity. The measured gaps after installation varied between 19mm and 22mm. The full-size ACM panel () dimensions measured 950mm-wide 2310mm-high. A pre-fabricated, welded window pod constructed from 5mm-thick aluminium was fixed onto the edge of the combustion chamber opening with eight (two on top, three on both vertical edges) 90mm-long ϕ8mm stainless steel screw anchor and plastic plugs. With reference to Figure 2, the panel widths were: Column A (wing wall) mm Column B - 223mm Column C - 953mm Column D - 952mm Column E - 380mm Commercial in Confidence BRE Global Ltd 2018 Page 8 of 46

10 The panel heights were: Row mm Row mm Row mm Row mm In accordance with the requirements of the test Standard [1], the cladding system measured: Requirement 6000mm above the top of the combustion chamber 2400mm width across the main wall 1200mm width across the wing wall 260mm (±100mm) wing wallcombustion chamber opening Actual measurement 6500mm 2635mm 1355mm 305mm 2000mm (H) x 2000mm (W) (±100mm) combustion chamber opening 2000mm 1950mm 4.4 Conditioning of the specimen The system did not require conditioning between completion of construction and test. Commercial in Confidence BRE Global Ltd 2018 Page 9 of 46

11 5 Test results 5.1 Test Conditions Ambient Temperature: 17 C Wind speed: <0.1 m/s Frequency of measurement: Data records were taken at 5 second intervals. Thermocouple locations: Level 1 External (50mm proud of the finished face). Level 2 External (50mm proud of the finished face). Level 2 Midpoint of the cavity. Level 2 Midpoint of insulation layer. 5.2 Temperature Profiles Figures provide the temperature profiles recorded during the test. Figure 10 shows the system before the test. Parameter Result Ts, Start Temperature 17 C ts, Start time Peak temperature / time at Level 2, External Peak temperature / time at Level 2, cavity Peak temperature / time at Level 2, insulation 2 minutes after ignition of crib. 570 C (34 minutes and 50 seconds after ts) 893 C (54 minutes and 5 seconds after ts) 918 C (57 minutes and 25 seconds after ts) Commercial in Confidence BRE Global Ltd 2018 Page 10 of 46

12 5.3 Visual Observations Table 2. Visual Observations Refer to Figure 3 for system schematic. Height measurements are given relative to a zero at the top of the combustion chamber. Unless otherwise specified, observations refer to the centre line above the hearth. Time (mins:secs) t s (mins:secs) Description 00:00 Ignition of crib. 01:30 02:00 0 The flames from the combustion chamber are impinging on the cladding system. Start time (ts) criteria achieved: External temperature 2.5m above the top of the combustion chamber in excess of 217 C (=200 C+Ts). 02:15 00:15 Flame tips to mid-height of panels 1C&1D. 03:00 01:00 Flame tips to bottom of panels 2C&2D. 04:00 02:00 Discolouration and slight distortion of panels 1C&1D up to mid-height. A small amount of paint detachment can be observed on the surface of the panels. 04:50 02:50 Flame tips up to the mid-height of panels 2C&2D. 05:00 03:00 Paint detachment can also be observed at the bottom of the panels 2C&2D. 06:00 04:00 Distortion can be observed on panels 2C&2D. 06:30 04:30 Distortion can be observed on the wing wall panel 1A. 07:30 05:30 Small amount of paint detachment can also be observed up to the mid-height of the panels 2C&2D. 08:30 06:30 Distortion can be observed on wing wall panel 0A. 09:05 07:05 10:00 08:00 10:30 08:30 Burning droplets from the system can be observed, with a selfsustained burning duration greater than 10 seconds. Detachment of the exposed mineral core from panel 1D can be observed. The thermal insulation of the system (1C&1D panel area) is exposed directly to flaming. Commercial in Confidence BRE Global Ltd 2018 Page 11 of 46

13 Time (mins:secs) t s (mins:secs) 11:05 09:05 11:30 09:30 Description A change in colour from grey to dark grey can be observed on the wing wall panel 1A. Along the central T -shaped rail, full-height consumption of the vertical edges of panels 1C&1D. 12:00 10:00 Detachment of the mineral core from panels 1C&1D can be observed. 12:40 10:40 13:40 11:40 14:30 12:30 15:00 13:00 Intermittent flaming is observed through the joints, from the cavity behind the top of panels 1C&1D. Consumption of a small area can be observed at the base of panels 2C&2D (below the cavity barrier). Intermittent flaming can be observed at the vertical junction between panels 2C&2D. Further detachment of the mineral core from panel 1C&1D can be observed. 16:00 14:00 Distortion can be observed on wing wall panel 2A. 17:00 15:00 Approximately 50% consumption of panels 1C&1D. 18:00 16:00 18:30 16:30 19:00 17:00 Further detachment of the mineral core from panel 1C&1D can be observed. Colour change from grey to dark grey/black across the majority of wing wall panels 0A&1A. Further detachment of the mineral core from panel 1C&1D can be observed. No significant visual changes since the last observation: flaming full width and height for approximately 2.0m above the combustion chamber (full-width), intermittent flames up to height of Level 2 thermocouples (5m above the combustion chamber opening). 19:30 17:30 The cavity barrier at the bottom of panels 2C&2D is exposed to fire. 20:00 18:00 Further detachment of the mineral core from panel 1C&1D. 21:30 19:30 Distortion can be observed on panels 3C/3D. Commercial in Confidence BRE Global Ltd 2018 Page 12 of 46

14 Time (mins:secs) t s (mins:secs) 22:00 20:00 25:00 23:00 Description Significant detachment of the mineral core from panels 1C&1D and 2C&2D. The insulation above the second cavity barrier is exposed to fire. Panels 2C&2D are consumed along the central T -shaped rail up to mid-height. 26:00 24:00 Approximately 90% consumption of panels 1C&1D. 27:00 25:00 Approximately 75% consumption of the central T -shaped rail holding panels 2C&2D. 29:00 27:00 Flame tips are present at the bottom edge of panels 3C&3D. 30:00 28:00 Fire source extinguished. 30:30 28:30 The exposed insulation of the system is glowing red and smouldering. 32:00 30:00 Flames can be observed at the top edge of panels 2C&2D. 36:00 34:00 41:00 39:00 Flames can be observed at the joint between panels 2C&2D and 3C&3D. The flaming at the horizontal joint between panels 2C&2D and 3C&3D continues. The cavity barrier at the base of panels 3C&3D directs the flames outwards from the façade. 44:00 42:00 Detachment of the mineral core from panel 2C. 46:00 44:00 The visible flames from the system are significantly reduced. 57:00 55:00 Visible flaming reduced to small flickering at the joint between panels 2D&3D. 60:00 58:00 Test terminated. Commercial in Confidence BRE Global Ltd 2018 Page 13 of 46

15 6 Post-test damage report 6.1 ACM ALPOLIC/A2 panels Row 0 - Panel 0A sustained significant distortion and discoloration (approximately 90% paint delamination, 10% dark discoloration) Panel 0B sustained discoloration and distortion on the left hand edge of the panel (viewed from the front, adjacent to the combustion chamber). Panel 0E was not significantly damaged. Row 1 - Panel 1A sustained significant distortion and discoloration (approximately 80% paint delamination, 10% dark discoloration). Panel 1B sustained significant distortion and discoloration (approximately 25% paint delamination, 45% dark discoloration). Panels 1C and 1D were both consumed up to 90%. Panel 1E was not significantly damaged. Row 2 - Panel 2A sustained distortion and discoloration (<5% paint delamination, <15% dark discoloration). Panel 2B sustained distortion and discoloration (<5%) at the base of the panel, left hand side. Panels 2C and 2D were consumed approximately 25% and sustained damage across the full panels surface. Panel 2E was not significantly damaged. Row 3 - Panels 3A and 3B sustained minor distortion. Panels 3C and 3D sustained damage at the bottom end (consumption <5%) and distortion. Paint delamination and discoloration was recorded on a surface <10%. Panel 1E was not significantly damaged. 6.2 Aluminium rail substructure The central aluminium T -shaped rail on the main wall was fully consumed up to a height of approximately 4.6m. Behind panels 3C&3D, the central aluminium rails were intact but discoloured and slightly distorted. The aluminium brackets situated immediately above the combustion chamber were severely damaged or melted. Following the removal of the ACM panels from the wing wall the aluminium substructure which held the panels in place did not sustain any visible damage 6.3 Thermal insulation (Kingspan K15) Row 0 - The thermal insulation installed on the wing wall (behind the 0A panel) did not sustain any significant damage. The aluminium foil on the insulation has partially detached but with no visible charring on the surface of the thermal insulation material. No significant damage was recorded on the insulation behind panels 0A (wing wall) and 0E (main wall). Row 1 - The thermal insulation installed on the wing wall (behind the 1A panel) did not sustain any significant damage. The aluminium foil on the insulation has partially detached but with no visible charring on the surface of the thermal insulation material. The thermal insulation installed on the main wall (behind the panels 1C and 1D) directly above the combustion was charred up to 95% from the surface. In some areas (approximately 15-20%) the masonry support structure is visible. The thermal insulation installed on the main wall (behind the panels 1B and 1E) did not sustain any significant damage on the surface. Commercial in Confidence BRE Global Ltd 2018 Page 14 of 46

16 Row 2 - The thermal insulation installed on the wing wall (behind the 2A panel) did not sustain any significant damage. The thermal insulation installed on the main wall (behind the panels 2C and 2D) was charred up to 90% from the surface. In some areas (<5%) the masonry support structure is visible. The thermal insulation installed on the main wall (behind the panels 2B and 2E) did not sustained any significant damage on the surface. Row 3 - The thermal insulation installed on the wing wall (behind the A panel) did not sustain any significant damage. The thermal insulation installed on the main wall (behind the panel 3C) was charred up to 50% from the surface. Behind the panel 3D the insulation was charred up to 90% from the surface. The thermal insulation installed on the main wall (behind the panels 3B and 3E) did not sustain any significant damage on the surface Horizontal cavity barriers (Siderise RH25G 90/30) The horizontal cavity barrier at the base of level 1 panels (between the vertical cavity barriers, directly above the combustion chamber) was partially detached during the fire exposure. It can be observed that the intumescent material reacted on the entire length of the cavity barrier positioned on the wing wall. A 1000mm-long section of horizontal cavity barrier had detached at the base of the second row panels beneath panel 2D. A 500mm-long section of horizontal cavity barrier had detached at the base of the third row panels beneath panels 3C&3D Vertical (compression) cavity barriers (Siderise RSV90/30) The fire damage to the cladding system on the main wall was contained within the bounds of the vertical cavity barriers across the combustion chamber opening. The cavity barriers remained intact despite significant charring and discolouration along the inside edges running parallel to the vertical edges of the combustion chamber. 7 Conclusion BS8414 Part 1: A1:2017 [1] does not contain acceptance criteria and therefore this test report does not indicate a pass or fail of the product. Commercial in Confidence BRE Global Ltd 2018 Page 15 of 46

17 8 Reference 1. BS : A1:2017, Fire performance of external cladding systems Part 1: Test method for non-load bearing external cladding systems applied to the masonry face of the building, British Standards Institution, London, BRE Test report P BS EN ISO 1716 Gross heat of combustion (calorific value). Commercial in Confidence BRE Global Ltd 2018 Page 16 of 46

18 9 Figures 9.1 Diagrams of finished face of the cladding system Figure 1. Test apparatus dimensions as specified by test Standard [1]. Commercial in Confidence BRE Global Ltd 2018 Page 17 of 46

19 Figure 2. Layout of panels and numbering system used for reporting. Not to scale. Commercial in Confidence BRE Global Ltd 2018 Page 18 of 46

20 Figure 3. TC positions and panel numbering (0A 3E). Not to scale. Commercial in Confidence BRE Global Ltd 2018 Page 19 of 46

21 9.2 Installation photographs Figure 4. Installation of L brackets and vertical and horizontal cavity barriers Commercial in Confidence BRE Global Ltd 2018 Page 20 of 46

22 Figure 5. Vertical (compression) and horizontal (intumescent) cavity barriers positioned at the top of the system. Commercial in Confidence BRE Global Ltd 2018 Page 21 of 46

23 Figure 6. Horizontal intumescent cavity barrier fixed through the entire depth on face turned brackets. Commercial in Confidence BRE Global Ltd 2018 Page 22 of 46

24 Figure 7. Cavity barriers (horizontal and vertical) and thermal insulation installed on the system. Commercial in Confidence BRE Global Ltd 2018 Page 23 of 46

25 Figure 8. Aluminium substructure ( T and L -shaped rails) installation Commercial in Confidence BRE Global Ltd 2018 Page 24 of 46

26 Figure 9. ACM panels installation on the substructure of the system with 20mm nominal gap between the panels. Commercial in Confidence BRE Global Ltd 2018 Page 25 of 46

27 Figure 10. Completed installation prior to test. Commercial in Confidence BRE Global Ltd 2018 Page 26 of 46

28 9.3 System drawings Figure 11. Front elevation, side elevation and vertical sections through the system (supplied by the Test Sponsor). Commercial in Confidence BRE Global Ltd 2018 Page 27 of 46

29 Figure 12. Front elevation, side elevation and vertical sections for the system substructure (supplied by the Test Sponsor). Commercial in Confidence BRE Global Ltd 2018 Page 28 of 46

30 Figure 13. Front elevation, side elevation for the insulation panel installation (supplied by the Test Sponsor). Commercial in Confidence BRE Global Ltd 2018 Page 29 of 46

31 Figure 14. Horizontal section through and above the combustion chamber, and insulation details for tested system (supplied by the Test Sponsor). Commercial in Confidence BRE Global Ltd 2018 Page 30 of 46

32 Figure 15. Vertical section through the cladding system, ACM panel detail and vertical and horizontal cavity barriers (supplied by the Test Sponsor). Commercial in Confidence BRE Global Ltd 2018 Page 31 of 46

33 9.4 Temperature data Figure 16. Level 1 external thermocouples. ts= 2 minutes after ignition of the crib. Commercial in Confidence BRE Global Ltd 2018 Page 32 of 46

34 Figure 17. Level 2 external thermocouples. ts= 2 minutes after ignition of the crib. Commercial in Confidence BRE Global Ltd 2018 Page 33 of 46

35 Figure 18. Level 2 cavity thermocouples. ts= 2 minutes after ignition of the crib. Commercial in Confidence BRE Global Ltd 2018 Page 34 of 46

36 Figure 19. Level 2 insulation thermocouples. ts= 2 minutes after ignition of the crib. Commercial in Confidence BRE Global Ltd 2018 Page 35 of 46

37 9.5 Post-test photographs Figure 20. Full height of the system post-test (main and wing wall). Commercial in Confidence BRE Global Ltd 2018 Page 36 of 46

38 Figure 21. Full height of the system post-test (wing wall). Commercial in Confidence BRE Global Ltd 2018 Page 37 of 46

39 Figure 22. Full height of the system post-test (main wall). Commercial in Confidence BRE Global Ltd 2018 Page 38 of 46

40 Figure 23. First row of ACM panels above the combustion chamber. Commercial in Confidence BRE Global Ltd 2018 Page 39 of 46

41 Figure 24. Second row of ACM panels (approximately 2300mm 4600mm above combustion chamber). Commercial in Confidence BRE Global Ltd 2018 Page 40 of 46

42 Figure 25. Third row of ACM panels (approximately 4600mm 6500mm above combustion chamber). Commercial in Confidence BRE Global Ltd 2018 Page 41 of 46

43 Figure 26. Aluminium rail substructure following removal of ACM panels. Commercial in Confidence BRE Global Ltd 2018 Page 42 of 46

44 Figure 27. Aluminium rail substructure following removal of ACM panels on the wing wall. Commercial in Confidence BRE Global Ltd 2018 Page 43 of 46

45 Figure 28. Insulation following removal of ACM panels and aluminium substructure. Commercial in Confidence BRE Global Ltd 2018 Page 44 of 46

46 Figure 29. Insulation following removal of ACM panels and aluminium substructure (approximately 2300mm 4600mm above combustion chamber). Commercial in Confidence BRE Global Ltd 2018 Page 45 of 46

47 Figure 30. Insulation following removal of ACM panels and aluminium substructure (approximately 4600mm 6500mm above combustion chamber). Commercial in Confidence BRE Global Ltd 2018 Report Ends Page 46 of 46