The fire sources are lit and the initial fumes are released. Right side has rock wool reinforcement above the window.
The Test LEPIR II has successfully passed
Geopietra wall on eps has successfully passed the LEPIR II test, obtaining the licence to clad public buildings such as residentials and skyscrepers.
Geopietra has always been committed to developing innovative materials and installation methods, obtaining endorsements for its products, providing the best guarantees for use on premises, and ensuring the safety and efficiency of the property solutions created.
Geopietra had already obtained top results in 2016 with the Single Burning Item Test held at the French test facility CSTB. The test on the fire behaviour of the materials, and the fire and fume class assigned in accordance with standard EN 13823, certified murogeopietra and components of the guaranteed solution as fire-resistant material, with the complete absence of toxic fumes released into the atmosphere, attesting to the excellent reaction to fire of the cladding installed on EPS.
Apart from being a legal requirement, optimising fire safety measures in buildings is important for protecting people and property.
In 2018 Geopietra deemed it necessary to also validate this process on the façades of buildings subject to specific regulations, such as residential buildings, public buildings, accommodation facilities and tower blocks, with the LEPIR II test. The CSTB facility has specific equipment to test the fire behaviour of façades on buildings subject to specific regulations. French regulation IT 249 on fire safety in public buildings did not previously consider manufactured stone veneer cladding. A solution of this type was tested for the first time in France.
Passing the LEPIR II test confirms that the murogeopietra solution on EPS fully complies with fire safety standards for buildings. Geopietra wall on EPS meets criteria for non-propagation of a flame front beyond the next floor level, and is authorised to cover R+2 category public buildings. CSTB - LEPIR 2 - Propagation of fire outside façades for buildings subject to specific regulations (residential buildings, public buildings, tower blocks) - FRANCE August 2018
The LEPIR II test involves setting fire to a façade fitted to a structure with two floors. The source that ignites and propagates the fire is on the ground floor and the progress of the fire is controlled through openings in the rear room wall. The temperature and radiant energy are measured. The ETAG 004 procedure is used to fit 20-cm EPS panels providing external insulation to the wall, which is made of perforated cement blocks 20 cm thick. The Geopietra manufactured stone veneer is then installed using the guaranteed procedure. The window sills are made with Geocover flashing. A panel of rock wool 20 cm thick was inserted at the architrave and jambs of the right window, which was deliberately omitted from the left window to further stress the façade cladding. Two 3-cwt piles of wood were placed on the ground floor in front of the windows, which were open and constituted the flow path propagating the fire. 6 internal thermocouples measured flow path temperatures, and another 14 placed 10 cm from the surface of the wall and distributed vertically over the entire height of the wall, measured the ambient temperature of the façade.
Diagram. Distribution of thermocouples inside and on the façade
After 1 minute 20 seconds the flames are already engulfing 3/4 of the windows on the upper floor.
After 5 minutes the temperature of the façade reaches approximately 800 °C and on the left side (with no rock wool protection) the glazing on the upper floor starts breaking.
After 8 minutes the façade reaches the maximum temperature of approximately 1100 °C and flames engulf the left window jambs.
After an hour, when all the fire source fuel has been used, it can be observed that the façade has not collapsed or yielded.
The fire fighters use strong jets of water to put out the fire, creating considerable thermal shock on the wall, but even when persisting on areas most stressed by the test, no collapse is observed.
The guaranteed murogeopietra installation solution on EPS preserves the solidity of the façade.
Visual inspection after completing the test.
The stone cladding was difficult to remove from the left window jamb and architrave. At the crack created through the thermal shock, it can be noted that in the absence of the panel of rock wool, the underlying EPS insulation has sublimed, whereas the guaranteed solution (Technical Manual section 6.21) has contributed to keeping the layers of adhesive, mesh and stone perfectly anchored to the base via the wall plugs.
The barrier effect of the rock wool panel was significant in triggering a protective reaction against the flames on the wall, reducing the temperature and preventing the flames from engulfing the frames on the upper floor. The PVC frame on the left window was unable to withstand the fire, allowing the flames to spread inside. Although the right window frame was ruined it withstood the fire, remaining hermetically sealed against the flames and the fumes.
It can be observed inside that the cellular cement bricks in the room where the fire propagated literally exploded due to the excessive heat. On examining the whole façade it can be observed that the EPS insulation visibly contracted, but the guaranteed solution and the murogeopietra characteristics of low conductivity and thermal inertia preserved the solidity of the façade.