Common materials for external insulation system of building
At present, the thermal insulation materials used in external wall insulation are mainly EPS (polystyrene foam), XPS (extruded polystyrene foam), PU (polyurethane foam), rock (ore) cotton board, glass wool felt and super light polystyrene particle insulation slurry. These materials generally have the disadvantage of energy saving and fire prevention. Organic materials are heat-resistant, easy to burn, and the release of a large amount of heat and a large number of toxic fumes during the combustion will not only accelerate the spread of the fire, but also cause the casualties of the trapped people and rescuers. Inorganic materials have dust and fine fibers, both air and bacteria, which have already become harmful to people's health. Moreover, the insulation performance is limited, and the application scope is limited.
Building energy conservation is the main content of implementing the national environmental protection and energy conservation policy, and is an important part of implementing the sustainable development strategy of the national economy. With the increase of energy-saving standard from 30% to 50%, exterior wall insulation technology has been greatly developed and has become an important building energy-saving technology in China. But in recent years, the exterior wall insulation materials fire frequently, causing serious casualties and property losses. Therefore, with the overall promotion of building energy conservation, building energy-saving fire prevention problem is becoming more and more serious.
Fire protection measures for strengthening the insulation of exterior walls should be divided into three aspects:
Setting up a windowsill wall with a height of no less than 0.8m or setting a non combustible solid eaves with a fire resistance limit of not less than 1.00h, the width should not be less than 0.5m, and the length should not be less than the width of the opening. GB50067-97 points out that the main problem of exterior wall fire prevention is to prevent or postpone the external wall of the external wall of the outside wall from the outside window sill. And residential buildings "outside the exterior door window should be set up the fireproof eaves, the wall height between the upper and lower windows should not be less than 1.2m, fire proof eaves should not be less than 1m, the fire limit should not be less than 1.0h" similar.
Generally speaking, two measures should be taken for the fire protection of the window sill wall of the external wall: one is to set the height of the window sill wall, and the other is to set the overhanging eaves. Of course, there are other measures. When the combustion material is combined with the refractory material, it can be considered as a refractory material (of course, the comprehensive fire resistance of the outer wall should be in accordance with the standard requirements). Therefore, the reasonable height of the windowsill wall and the setting of the eaves as described above or the use of refractory or non flammable insulation (including composite materials) or the use of refractory and noncombustible materials in this part are provided. The heat preservation "beam" of the material is the key point of building exterior wall fire prevention.
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