Principles to be followed in selecting and purchasing grade A1 fire-proof and thermal insulation materials
1. The Principles of Choosing Paint Exterior Decoration System as far as possible
The use of coatings exterior decoration system is more intuitive even when cracks occur, which is conducive to the control of cracks. How to avoid the cracking of the exterior decoration of the facing bricks when choosing the paste facing bricks?
The whole system must be verified by large-scale experiments such as seismic test, weatherability test and fire response test. External thermal insulation and exterior decorative facing brick system meets the comprehensive functions of system bonding safety, assistant mechanical anchoring safety, flexible stress release safety, weather resistance and fire safety. The single-net structure leveled by traditional cement mortar is not susceptible to large load and easy cracking. The external surface is subjected to positive and negative wind pressure, thermal expansion and cold contraction, dry shrinkage and wet expansion. The light mortar with small expansion rate should be leveled and double-net structure should be adopted to complete flexible mutation, increase load and add crack resistance.
2. Principles of Suppliers of External Wall Insulation System for Complete Supply of System Data
External wall thermal insulation is an inorganic entity. The relevant layers of the system should cooperate, not only require flexible mutation, but also have certain compatibility and covariance to form a composite entity. Therefore, the external wall thermal insulation system should be supplied by the system supplier, in order to ensure the matching of the system inion and the completion of the anti-cracking technical road, which is conducive to understanding the responsibility of the project quality.
3. Sealing Principle of Enhancing the Change of Material Quantity in the Cut-off Part of Heat Insulation
Because the density of these materials is too different from that of other materials, the elastic modulus and linear shrinkage coefficient are not the same, and the deion is different under the action of temperature stress. It is very easy to crack the surface layer in these parts. At the same time, the waterproof disposal of these parts should be considered to avoid water intrusion into the insulation system, prevent the damage of the system caused by frost heave, and affect the normal service life and durability of the system.
4. Consideration should be given to the compatibility of data at all levels and the principle of mating
As the external thermal insulation system is composed of multi-layer data, in terms of crack resistance function, we should consider not only the function of each layer of data itself, but also the compatibility and marriage of data.
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