1, temperature environment, heat preservation materials should be selected according to the local climate and temperature environment. For example, some cold areas in the north choose thermal insulation materials with better thermal insulation performance, such as benzene board, while some places in the south with little temperature difference can choose thermal insulation mortar materials, such as vitrified beads thermal insulation mortar.
2. Thermal conductivity. Under the condition of satisfying the thermal insulation effect, thermal insulation materials with low thermal conductivity should be preferred, which not only meets the design requirements, but also facilitates construction, reduces transportation costs and occupies small space.
3, stability, the selected thermal insulation materials should have good chemical stability;
4, mechanical strength, external wall insulation materials should be able to withstand a certain load and can resist external impact.
5, high cost performance, using the unit thermal resistance price of external wall insulation materials to compare and choose relatively low-cost insulation materials.
6, flame retardant, in the building structure, areas with high fire protection requirements should give priority to the use of flame retardant insulation materials, inorganic insulation materials, A-level insulation materials.
7, water absorption, thermal conductivity of external wall insulation materials will increase after water absorption, so you should choose insulation materials with low water absorption or no water absorption to avoid increasing the thermal conductivity of insulation materials.
8. Low-density and low-density external wall insulation materials can reduce the load and facilitate construction.
9, constructability, external wall insulation materials should have the characteristics of convenient construction, simple operation, easy to ensure quality, such as thermal insulation mortar materials, can be used to add water and stir on site for construction.
10, service life, building external wall insulation materials are affected by freeze-thaw cycles in nature all the year round. With the extension of time, the physical properties of thermal insulation materials will inevitably decline, and the energy-saving effect will also decline. Therefore, thermal insulation materials with stable physical properties and good aging resistance should be selected to ensure energy-saving effect and prolong service life. (Excerpt from: WeChat official account, bavly)