The main purpose of extruded board and its application in external thermal insulation of exterior wall extruded board has the structure of continuous and uniform surface layer and closed cell honeycomb structure. This structure forms uniform thickness honeycomb wall, which is closely connected and there is no gap between the walls. Such uniform structure makes the extruded board have excellent temperature and thermal insulation performance, superior moisture resistance and high compressive strength. Therefore, in fact, the main purpose of extruded board abroad is
1 roof thermal insulation and protection of waterproof layer (inverted roof)
2 low temperature storage facilities (low temperature cold storage, refrigerated truck)
3. Pave cushion to control ground frost heave under the pavement and subgrade of highway, railway and airport runway in alpine areas:
4. Filling and laying of suspended floors such as composite floor. At the same time, it is also used for moisture-proof, thermal insulation and sound insulation. It is used for laying thermal insulation under floor radiant heating.
In foreign countries, extruded boards are generally not used in the external insulation of exterior walls, and there are no relevant standards and specifications. However, after the arrival of extruded board in China, its main uses have undergone significant changes. In addition to the above uses, other uses have been developed according to China's national conditions:
1. Reinforced concrete roof thermal insulation and profiled steel sheet roof thermal insulation
2 permanent or temporary formwork for concrete pouring
3. External insulation system of cast-in-situ concrete meshless extruded plate:
4. External insulation system of cast-in-situ concrete inclined embedded steel wire grid extruded plate:
5. External thermal insulation system of mechanically fixed extruded steel wire grid plate
6 extruded board thin plastering external insulation system
7. External decoration and thermal insulation system of extruded board, etc.
Although these external insulation systems have been used in China for several years, they have more or less problems. So far, no national standards, industrial standards, standard atlas and construction procedures have been issued. Their application has also been controversial. However, because the extruded board has high compressive performance and impact toughness. In addition, the supporting use of special flexible crack resistant mortar and alkali resistant mesh cloth can make the external insulation system have better impact resistance. Therefore, it is generally recognized that it is used for the external insulation of the first external wall of the building, and its safety design is mainly nail, supplemented by glue