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The composition, system construction, construction technology and function of glass wool board external thermal insulation system were introduced in this paper, the glass wool board was sewed warp and weft direction by basalt fiber and treated by waterproof and flame retardant interface agent (modified glass wool board), and the properties of the modified glass wool board and the system were also tested and analyzed. Results show that all the performance of the system meet the requirement of Technical specification for external thermal insulation JGJ144-2014 and Technical Specification for External Thermal Insulation Composite Systems Based on Glass Wool Board DB11/T1117-2014 company standard. A good effect was obtained by applying modified system in the energy-efficient construction in existing building of Xicheng district. Results demonstrate that the modified system is not only a new building fire insulation technology but also meets the building energy efficiency and fire resistance property requirements. Its market has a good prospect and promoting significance. Introduction Presently the thermal insulation system of the building external walls in China mainly adopts the polyphenyl plate thin plastering system. The primary thermal insulation material for the polyphenyl plate thin plastering system is organic combustible polystyrene foam, such as EPS and XPS, which are inflammable and shows little fire resistance. When flaming, these materials give out great smoke and high toxicity, and will be melted to drip when the temperature is up to 80°C. Once the buildings applied EPS or XPS as external thermal insulation for external walls have caught fire, it will be very hard to put out the fire. In addition to the inflammability of polystyrene foam, the chimney effect and open effect born of the material’s fast contraction and molten drop also prove to be the key reasons for the quick spreading of fire [1-3] . So we can see the fire resistance of this system is a little on the low side, and thus fail to achieve the effect of both energy saving and fire resistance. Although such materials help realize energy saving for the Chinese buildings, most of which are resided by concentrated population and designed in multiple stories and high-rise structures, great hidden fires have also been brought about, such as the auxiliary building at the new location of CCTV caught fire on Feb.9, 2009, and the great fire of a residential building in Shanghai on Nov.15, 2010, and other major accidents. All of these accidents lead to huge socio economic losses, heavy casualties and environmental pollutions [4, 5] . Considering this, it is of great urgency for a product to be available in 2nd Annual International Conference on Advanced Material Engineering (AME 2016) © 2016. The authors Published by Atlantis Press 825 the current building material market which will enable the technical insulation design for buildings, eliminate hidden fire and will not make it difficult for the construction or increase the project cost. In terms of the hidden fire of the external thermal insulation system (ETIS), the following two aspects are primarily considered. a. Ignitability: In case of combustion source or kindling material, if the system can be ignited or give rise to combustion and the requirements on the system’s intrinsic combustion performance. b. Transmissibility: In case of combustion or fire, if the system can spread flame as well as the requirements on the system’s resistance to external fire or on the fire resistance performance. Modified glass wool board is a type of highly efficient inorganic thermal insulation material. Compared with organic polystyrene, polyurethane and other foam insulation materials, this material is characterized by incombustibility (grade A), free of flame ignitability or transmissibility and shows low unit weight, low heat conductivity coefficient, fire resistance, nontoxicity, stable chemical property and long service life. Therefore, it proves to be an ideal thermal insulation material and can be widely used in various industries. The wind load performance, weather resistance, shock strength and other performance of the modified glass wool board for ETIS comply with all the indicators of THE JG144-2004 Technical Specification for External Thermal Insulation on Walls. Materials and Structures of the Modified Glass Wool Board-based ETIS Materials Glass wool board is produced through the following processes. Melt cullet, silica sand, dolomite, sodium carbonate, borax and other materials into glass before making it into fibers. After spraying special thermosetting adhesive, press these fibers into board-shaped thermal insulation material, as shown in Fig.1. The application of glass wool board to external insulation system of external walls will exhibit desirable fire resistance, thermal insulation, energy saving and sound insulation performance, but there are also some problems. Firstly, the tensile strength in the vertical direction of the glass wool board and the board is a little on the low side, i.e. generally lower than 7kPa. Secondly, the material shows low resistance to water and alkali. When exposed to alkaline environment, it is prone to corrosion which leads to a sharp decline in strength. Through research on the issue of low strength, we adopt the longitude and latitude sewing of glass wool board to raise its tensile strength perpendicular to the board, which will be increased to over 15kPa, as shown in Fig.2. Targeted at the low resistance to water and alkali, the water and alkali resistance adhesion agent has been applied to covering the six facets of the glass wool board as a way of raising its water resistance. Meanwhile, the glass wool board and the alkaline environment will be isolated to raise its alkali resistance. All these efforts bring about the modified glass wool board, as shown in Fig.3.

The Performance Study of Modified Glass Wool Board External Thermal Insulation System and the Application in the Energy-efficient Construction in Existing Building