External thermal insulation materials in the past two years because of the controversy of fire prevention issues, construction projects on the application of external thermal insulation also because of some national fire prevention policies encounter difficulties. Grade A1 fire-proof thermal insulation materials have been tracking the development and application trend of various new types of external thermal insulation materials and related product standards and application specifications. Some of the comments on the products are based on personal experience, and there are some inappropriate points. Professionals are also invited to make more comments and suggestions.
Thermal insulation materials are classified according to their properties, which are generally divided into organic materials, inorganic materials and composite materials. Different thermal insulation materials have different performances and different prices. In this paper, the thermal insulation properties of materials, i. e. the value of thermal conductivity, are arranged in order. The composition of products, the effect, the application value and the related manufacturers are introduced in turn.
This paper mainly introduces the performance characteristics of the vacuum insulation board. The thermal conductivity is 0.008W/(m.K). The board is a kind of high efficiency insulation board made of inorganic fiber core and high resistance gas composite film through vacuum packaging technology and special interface mortar.
The thermal conductivity of air is about 0.023W/(m.K). If the thermal conductivity of air is lower than that of air, there is only vacuum. Therefore, the thermal conductivity of vacuum insulation board is the lowest among the existing insulation materials. Its greatest advantage is that its thermal insulation performance can override all other types of thermal insulation materials. However, the board also has fatal defects, such as the vacuum is difficult to maintain, if damaged, the thermal insulation performance of the board will drop sharply; secondly, the existing construction technology leads to too many slab joints, too many hot bridges, causing a great risk of condensation; thirdly, the construction smoothness is difficult to control, and the risk of thin plastering system falling off is also high; currently, the cost of the product is relatively high, and the property of the product is high. The advantage of price ratio is not obvious. If the cost of the product is further reduced, it can be considered to be applied to the balcony floor to prevent the use of cold bridges. The simulation results show that only 500 mm wide can be used as an insulating bridge on the balcony floor. Then the balcony floor does not need a large area of extruded plastic sheets up to 3 cm thick. The vacuum insulation sheet with 8 mm thick is only 500 mm wide, which greatly saves the consumption.
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