Vertical Fire Test
The purpose of the investigation was to evaluate the large-scale fire propagation properties of unfaced 100 mm thickness Expanded Polystyrene (EPS) insulation material (BASF Styropor KF 262 – STYFRENE) when used as an insulation system for thermally insulated building envelopes. The system was tested for side-cladding applications and must be read in conjunction with the test report for over-purlin roof applications, test report FTC 12/128, tested previously.
- 1. Description of Material
The material evaluated was white 100 mm thickness Expanded Polystyrene (EPS) insulation material (BASF Styropor KF 262 – STYFRENE) without any facing or backing material laminated onto the sheets. The size of the samples delivered by Technopol was in sheets of 6 m long by 1.2 m wide and a thickness of 100 mm.
- 2. Test Procedures
3.1 SANS 10177-11 (Vertical Orientation)
The fire propagation properties associated with the use of this insulation system in a side cladding application were investigated in terms of the relevant section of SANS 10177-11. A vertical specimen frame was fitted to the front end of the test installation against the first horizontal hanging frame. The insulation material was installed onto the inside between the horizontal purlins. The fire source was placed 600 mm either side of the centre of the vertical frame. A typical installation is shown schematically in Figure 3.1.1 and Figure 3.1.2.
The fire source consisted of two packs of 7.5 kg consisting of 38 mm x 38 mm pine sticks, each 300 mm in length, four per layer and ten layers high.
No temperatures were recorded during this evaluation. The criterion that will be applied when assessing whether the material is suitable for vertical applications is that flame spread onto the roof portion will not be allowed.
- 3. Test Results
4.1 SANS 10177-11 (Vertical Orientation)
The installation prior to the ignition of the fire sources is shown in Figure 4.1.1. The material started to soften at 3 minutes 35 seconds above the right crib and at 4 minutes 10 seconds above the left crib. The bottom edge of the material softened at 4 minutes 30 seconds at the left crib and at 4 minutes 50 seconds at the right crib.
Charring of the joint at the left crib occurred at 5 minutes 30 seconds. Figure 4.1.2 shows after the material started to coagulate on the left and right side at 7 minutes 20 seconds and 8 minutes 40 seconds respectively. The roof panels started coagulating at 9 minutes and 5 seconds.
The crib on the right side collapsed after 13 minutes and 15 seconds and the crib on the left after 15 minutes and 55 seconds. Molten material on the ground did ignite but did not propagate fire towards the installation. The cribs were completely consumed after 19 minutes.
Figure 4.1.3 shows the installation after the test was concluded.
- 4. Discussion of Results
The material as tested would be classified as combustible in terms of SANS 10177-5:2012 but no fire propagation was noted during either of the SANS 10177-11 large-scale fire tests as conducted.
- 5. Conclusion
The following can be concluded for the 100 mm thickness STYFRENE insulation material supplied by Technopol as tested and installed as side-cladding, in accordance with SANS 10177-11(Vertical):
– The material is classified as combustible (B).
– The material was only tested without a sprinkler installation.
– The classification awarded to the material based on the performance of this test in accordance with the SANS 428 protocol is summarized as follows:
– Class B / B1 / 2/ V (UNSPR)
– Should the Classification of the previous test, FTC 12/128, as a horizontal application be incorporated in this test the classification should be as follows:
– Class B / B1 / 2/ H & V (UNSPR)*
In general, provision of adequate roof ventilation and/or a sprinkler protection system for each individual installation would need to be considered based on the size, slope and configuration of the roof and should be part of the fire safe design of the building to satisfy the requirements as contemplated by SANS 10400-T.
The above results does not relate to fire resistance. In instances where fire resistance is a requirement, this property needs to be determined in terms of SANS 10177-2.