Improve the level of renovation technology for external insulation of exterior walls â–¡ Asphalt Paint (Shanghai) Co., Ltd. External insulation materials for exterior walls should pay attention to new issues compared with new construction. The external thermal insulation renovation project is more complicated than the exterior thermal insulation project of the newly-built external wall. There are even more issues to consider. In the external insulation of existing buildings, it must be considered. Because the external wall insulation has very strict requirements on the flatness and firmness of the base layer, the base layer treatment should be more meticulous, and the selected retreading materials such as base filling materials. The requirements for quality such as penetrating primers are more stringent.
When choosing an exterior paint. Since solvent-based paints have a strong corrosion effect on insulation boards, it is recommended to use less solvent-based paints. Due to special needs, gold paint and other solvent-based paints are used. Must use high-quality cross-linked interface protection agent with a closed protection function to perform a comprehensive brushing treatment on the insulation layer. Cut off the penetration of the solvent.
The difference between external thermal insulation renovation and new construction construction External wall external thermal insulation renovation and new external thermal insulation of external walls of buildings Compared to construction, we must consider the impact of renovation construction on the owners of buildings in use. For example, the hotel carries out external thermal insulation renovation. Due to the fact that the hotels are all in operation, most hotels do not choose to stop renovations.
Because this will bring huge economic losses to the hotel. How to deal with existing buildings while operating refurbishment problems. It is a big challenge for the renovation of exterior insulation.
Throughout the renovation process. Analyzing lesions and testing lesions is the most important part of the entire refurbishment process, just as a doctor correctly diagnoses the patient's cause. Only correct diagnosis of the cause of the disease can correct the right medicine. The analysis of the old wall surface should be based on different old grass-roots walls (concrete walls, small concrete blocks, aerated concrete block walls, etc.), different old base finishes (old mosaics, tiled walls, old Coated walls, old water-brushed stone walls, etc.), different lesions (crack, shedding, empty drums, mildew, etc.), divided into categories. research seriously.
The insulation system is only one of the refurbishment processes used when choosing materials for renovation projects. However, the refurbishment project can not only focus on this process, but should do a good job supporting materials and equipment choices. Otherwise, lesions will occur soon after the retreaded insulation and the new coating. Supporting materials, such as special wins, will be filled with paper and stone. Chemicals, please wash lotion and so on. The selection of these materials should have sufficient scientific basis or have engineering cases. Otherwise it will have a serious impact on the quality of the insulation and the appearance of the new finish.
In the selection of construction equipment, in addition to the construction equipment for new building finishes, special equipment is required. Such as high pressure cleaning water gun. Infusion material pump. polisher.
Cutting machine and so on.
Treatment of old coating surface lesions Wall contamination treatment: Dust is washed with high-pressure water, and some neutral detergents are used for cleaning the more polluted parts: rust and alkali are treated with weak acid solution, followed by high pressure water. rinse.
Coating peeling treatment: use high-pressure water gun to wash, local residues using a blade or electric wire wheel please remove: the entire coating from the grass roots peel off the larger area of ​​the site using electric wire cleaning it again: brushing penetrating primer .
3t coating powder treatment: high pressure water gun cleaning, check if there are precipitates the next day. Should be re-washed, dry after brushing penetrating sealer.
4 empty drum treatment: first check out the empty drum range, make a mark, and then use a wheel cutting machine to cut it off; cut the base and cut the hair and remove dust, fully wet the substrate with water, brush a repair mortar: then 2 - 3 repair mortar repair leveling.
5. Crack treatment: (1) Non-structural crack treatment.
Grind the coating on the outer surface of the crack with a grinding wheel. The plain concrete cracks on both sides of the concrete surface are removed with a wire brush and a brush. Apply a highly transparent primer to the cracks. Use elastic paint repair patch. The patch width should not exceed 20mm. (2) Structural crack treatment. First, the outer surface of the crack was polished off with a grinding wheel grinder to expose the plain concrete surface. Use a wire brush and a brush to remove dust from the cracks when the width of the crack is greater than. At 2mm, the filling method is used. Less than 0.2mm treatment method is the same as non-structural cracks. Install the filling nozzle and inject the epoxy repair material.
6, steel corrosion treatment: the steel around the concrete with diamond sheet cutting machine cut; with steel brush grinding rust, brushing rust within 2 hours after a layer of rust-proof material: mortar repair. The repair method is empty. If steel bars need to be cut off. After the steel bar is cut off, the hollow drum is directly repaired with mortar.
Treatment of old tile surface lesions I Blanking, shedding tile treatment: Determine looseness. Tiles from the shell; use an electric cutter or a percussion drill to remove the looseness and lift the shell's face brick: remove dirt from the surface. Impurities, etc.: Repaired with cement mortar. Until flush with the tile surface or the old coated surface.
2. Crack treatment: (1) Identify where cracks occur (If major structural damage or cracks are found, immediately notify the owner and the designer must take necessary measures): (2) If the crack width is less than 2mm, repairs can be made directly. Putty repair: If the crack width is greater than 2mm, proceed as follows: Use a percussive drill or electric grinder to cut the v-notch along the crack: remove the dust in the v-groove, impurities, etc.: Apply the repair putty to the v-shaped concave In the tank, it is slightly lower than the tile surface, let the mortar and putty dry for 24 hours in good weather.
Putty renovation putty. Rinse the outer wall with a high-pressure water gun to remove impurities such as dirt: Apply a cationic polymer-modified cement with a steel spatula to renovate the putty. Czsrr
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