The PU material used in exterior insulation in fire accident Nov 15th
As per media report, PU material is involved in the exterior insulation project in the fire accident Nov 15th, the journalist contacted the deputy chainman of CPUIA, Mr. Li JianBo for the detailed.
硬泡聚氨酯喷涂 砂浆找平 抗裂砂浆粘贴网格布
According to Mr. Li, the exterior insulation used for this building is rigid PU foam thin plaster with EPS panel thin plaster system, with the former mainly used for the main building, and the latter for the corner and window area. The main construction procedure is, basic wall preparation, PU rigid foam spray, mortar leveling, anti-crack mortar plus fishnet clothing, exterior decorating. As reported, the rigid foam had just been constructed to around 12th floor, and the floors lower than 10 have gone through the step of mortar leveling.
According to related exterior insulation codes, the qualified insulation material itself will be not be ignited by the welding sparkles. As per introduction of director of Shanghai Fire Fighting Bureau, the fire was initiated by the nylon safe net ignited by unauthorized welding, then it spread to the combustible bamboo plate on the scaffolding, with help of strong wind, spreading very quickly then finally ignited some foam material and interior furniture and decoration material and so on, especially via the interior electrical wires, gas tubes spreading into the rooms, and finally caused severe damage.
From the picture of the building taken after the fire, the building exterior wall lower than 12 floor which has been insulted, especially those mortar leveled, the insulation was almost not impacted, even no sign of burning, it is obvious that it did not contribute the fire; and the upper part the fire entirely caused by combustible safe net and bamboo plates.
Mr. Li stated that most of fire accidents related to exterior insulation in China occurred at construction period. Considering this fact, he recommends we should ensure the material has to be fulfill related codes and standards, more importantly, improve the construction safety management, enhance the construction skill & safe training, facilitate the developing of corresponding regulations and put into strict implementation.