Exterior wall coating construction plan

A. Material preparation

a. Putty: The finished water-resistant putty may be prepared with white cement, synthetic resin emulsion, etc.

b. Primer coating: water-based or solvent-based coating, which has good matching properties with the top coating.

c. Top coating: Latex paint should comply with the requirements of GB/T 9755 "Synthetic Resin Emulsion Exterior Wall Coating" standard.

B. Tools and supplies preparation

Putty knife, wire brush, putty scraper or scraper, putty pallet, sandpaper, roller brush, brush, paint brush, portable electric Mixer, filter sieve, plastic bucket, grading plate, steel tape measure, powder wire package, film tape, shielding plate, masking paper, plastic protective glasses, mask, gloves, work clothes, rubber shoes.

C. Technical preparation

a. Inspection and acceptance of the base layer

The base layer should be smooth, clean, free of floating sand, and no peeling. The moisture content of concrete and plaster surface layers should be below 10, and the pH value should be less than 9. Generally, the newly plastered base layer should be dry for 10 days in summer and more than 20 days in winter when the ventilation is good. Construction shall not be carried out on base layers that have not passed the inspection.

b. Sample

When the construction area is large, a sample should be made according to the design requirements, and after approval by the design and construction unit, it will be used as the basis for acceptance.

c. On-site

The distance between the scaffolding and the wall should be appropriate, and the shelf should be of sufficient length, with no less than three fulcrums. Cover exterior windows to avoid paint contamination during construction.

d. Personnel

The construction team should have a technical person in charge. The main operators must be trained in the construction technology of this process. Only those who are qualified can take up the job. The auxiliary workers should have special guidance. A. Base layer treatment

First remove dust and other adherents on the surface of the base layer. Larger depressions should be smoothed with polymer cement mortar. Wait for it to dry, and then repair smaller holes and cracks with cement latex putty. When the wall surface is alkali blooming, use zinc sulfate solution or dilute hydrochloric acid solution to scrub. Use detergent to clean oil stains, and finally wash them with clean water.

The original coating on the base layer should be treated differently according to different situations: old coatings that are loose, crusty, and brittle should be removed; old coatings that are firmly adhered should be roughened with sandpaper; those that are not water-resistant The coating should be completely removed.

B. Apply primer (except wood and painted surfaces)

If the wall surface is loose and highly absorbent, you can use a roller to apply it evenly on the cleaned base layer Apply one or two coats of glue (acrylic emulsion or water-soluble construction glue diluted with 3 to 5 times of water). Do not miss or apply too much to cause flow or accumulation.

C. Partial patching with putty

After the base layer is dry, use putty to find uneven spots, and sand them flat after drying. The finished putty should be stirred evenly before use. If the putty is thick, you can add water to adjust.

D. Full putty

Place the putty on the pallet and use a trowel or leather scraper to apply it, first up and then down. Apply putty 2 to 3 times according to the base layer conditions and decoration requirements. Each coat of putty should not be too thick. After the putty dries, it should be polished with sandpaper in time. It should not be wavy or leave scratches. After polishing, the floating dust should be swept away.

E. Apply primer

Stir the primer evenly. If the paint is thick, it can be diluted according to the requirements of the product instructions. Use a roller brush or row brush to apply it evenly, being careful not to miss the brush or apply it too thickly. After the primer dries, the putty can be applied locally if necessary, and the sand is leveled after it dries.

F. Brushing the surface coating

Dilute the surface coating according to the proportion required in the product instructions and stir evenly. When the wall needs color separation, first use a pink thread bag or an ink fountain to pop out the color separation line, and leave 1 to 2cm of room at the intersection of colors when painting. One person dips a roller brush into the paint and spreads it evenly, and the other person then uses a row of brushes to smooth out the paint marks and spatter. Bottom penetration and dripping should be prevented. Each surface should be painted starting from the edge and working towards the other side, and should be completed in one go to avoid joint marks. After the first coat is dry, apply a second coat of paint. Generally, 2 to 3 coats of paint are applied, depending on the situation. A. Check the label before using the paint, stir it carefully and evenly, and close the lid tightly after use.

B. The storage and construction of coatings should comply with the temperature conditions specified in the product instructions, which should usually be above 5°C. If the paint freezes during storage and transportation, it should be placed in a room with a higher temperature and allowed to thaw naturally. Do not bake it with fire. The thawed paint can only be used after it has been confirmed that there has been no qualitative change.

C. Paint coloring is best done by the manufacturer or distributor to ensure the consistency of the color of the batch of paint. If color mixing is required at the construction site, the color paste provided by the manufacturer or designated brand and origin must be mixed by a dedicated person according to the usage requirements and proportions.

D. Attention should be paid to the protection of finished products in coating projects to prevent artificial contamination caused by cross-working operations. If the wall surface that has been constructed is contaminated by dirt, it can be gently scrubbed with a clean wet rag. If the contamination is serious, it should be repainted.

E. Pay attention to the weather forecast before construction and avoid working before rain or snow comes.

F. Painting tools should be cleaned promptly after use and kept properly. A. During construction, operators should ensure adequate sleep to ensure concentration and no accidents when working at height;

B. Before construction, check whether the scaffolding and shelf boards are firmly erected and confirm that they are safe and reliable. Operation can begin;

C. It is prohibited to wear slippers, shoes with smooth soles and high heels when working on scaffolds;

D. When storing and using solvent-based primers, topcoats and diluted Fireworks are strictly prohibited in places where chemicals are used;

E. Wear necessary protective glasses and protective masks;

F. Construction and lighting appliances must be installed and wired in accordance with electrician safety regulations. It is strictly prohibited to pull or pull wires at will. Wiring;

G. Provide safety education to all personnel on site. Construction environmental conditions. The construction, drying and film formation of architectural coatings must be carried out at a certain temperature and humidity. Usually the film formation performance of latex coatings is tested at 23C±2C and relative humidity of 60-70. The minimum temperature of paint is usually greater than 5C. The most suitable temperature is 10-35C, and the construction humidity is 60-70. In addition, do not apply it under direct sunlight, especially in summer. The surface temperature will be higher under direct sunlight and the water will evaporate too quickly. Affects poor film formation of the coating. It is not suitable for construction when the wind is strong, as it will accelerate the evaporation process of water, and the coating is easily contaminated with dust.

In winter, many outdoor projects are basically shut down, which has little impact on general indoor decoration projects. When constructing exterior wall paint in winter, you must pay attention to the temperature difference between indoors and outdoors to avoid thermal expansion and contraction, which may cause certain damage to the constructed wall. In order to minimize damage, how should we decorate the house?

It should be noted that when applying paint in winter, the room temperature should generally not be lower than 10°C. As long as you pay attention to several aspects such as temperature, ventilation, and application of added auxiliary materials, you can ensure the construction quality and original appearance of paint and coatings. In order to ensure the volatilization of harmful substances and the dryness of the paint surface, windows should be opened for ventilation soon after painting, but it is also necessary to prevent outdoor dust from contaminating the painted surface.

Also, the outdoor temperature is low in winter. Opening windows is conducive to the volatilization and drying of indoor formaldehyde and other harmful substances and paint products, but it may cause the paint to powder or even deteriorate. Wall paint that has not dried thoroughly or Paint is easily frozen, causing the wall to become discolored and peeling after spring. Therefore, ventilation should be chosen during the warmer noon period, and the ventilation time should not be too long. When the temperature drops sharply, close the windows as soon as possible and wait until the outdoor temperature is close to the indoor temperature before opening the windows for ventilation. This can effectively prevent the paint surface from shrinking due to low temperatures and causing the paint surface to crack.

Exterior wall latex paint often cracks during winter construction, so the construction temperature should be higher than the minimum temperature for paint construction. It is best to paint strictly according to the temperature in the product description. According to general construction experience, the ambient temperature when applying paint should not be lower than 5°C. The ambient temperature when applying commonly used mixed-color paint should be at least above 0°C, and the ambient temperature when applying varnish should not be lower than 8°C. If the temperature is low, emulsion film-forming additives can be added. Some owners turn on the heating during decoration. Although the indoor temperature is maintained, they must pay attention to the temperature difference between indoor and outdoor to avoid thermal expansion and contraction, because the strong confrontation between cold and heat will also cause certain damage to the maintenance of paint and coating surfaces. Influence.

Before construction, the cracks on the bottom of the wall must be filled in and the putty must be scraped off. The putty should not be scraped too thickly, and try not to use cement putty. In winter, the indoor air is dry and loses water quickly, which can easily cause hollowing, cracking, and uneven walls. The application should not be too thick during construction, and the next layer can be applied only after the paint is completely dry.