Why is the wall too dry and the putty bubbles?

When hanging putty, the wall must be dry. If there are bubbles, it may be your putty, and it is very thin.

Specific steps and precautions for scraping putty

As the basic decoration of family decoration, putty scraping plays a very important role in the basic decoration. Its quality directly affects the quality of subsequent projects. So how is putty scraping implemented in the decoration?

1. Remove the dust from the original wall surface. Clean wall surface is the basis to ensure smoothness.

2. If peeling occurs during cleaning, clean it with putty knife.

3. Scrape putty where it needs to be repaired.

4. After the completion of sandpaper grinding.

Paint. Use brand latex paint mixed with 10%- 15% water, and then paint the wall.

The above are the basic steps of putty scraping, but there are still some places to pay attention to. For example:

1. When you are going to paint the wall with latex paint, but the wall was originally painted with lime or paint, you must first remove the original wall and brush it again after scraping putty.

2. For customers who buy color latex paint by themselves, Bian Xiao reminds everyone that latex paint must be mixed with water at one time to avoid color difference and disharmony when painting.

3. The quality of roller brush is also the key to consider the quality of putty scraping. Therefore, roller brushes must be good, for example, wool quality and wool quantity need to be moderate and uniform, which directly affects the painting effect after all.

4. When painting, brush the ceiling first and then the wall.

5. When brushing, be sure to brush it for the second time after the first time is dry, so as not to brush off the wall skin.

6. When painting, if you want a light color effect, you can brush it twice. If you want bright colors, you need to brush them three times.

Standard construction technology and matters needing attention of putty scraping

A, blow be bored with child's standard construction technology:

For the first time, workers are required to scrape gypsum powder, which has the advantage of quick drying, especially in rainy and humid weather. Gypsum has good hardness, good adhesion, not easy to crack and shrink when it is dry, and good filling force, which can block small eyes on the wall and will not appear after it is dry. But after filling it with putty, you can see the contracted small eyes. If the filling is too thick and it dries slowly, be sure to scrape the plaster for the first time and use up all the glue.

The second time, blow putty. The focus of this blow is leveling. Because the wall is not so flat and straight, it needs to be leveled and straightened. The outer corner must be straightened with an aluminum alloy ruler of about 3 meters, and the inner corner must be straightened, so that you can see whether the edge is an angle or an angle, and the effect is very good. When it is dry, polish it again. This requirement is not too high, but you must wait until it is dry before applying putty for the third time.

The third time, in the case that the putty was not scraped flat in the second time, some filling and fine scraping were done. The glue can be lighter, which can ensure easy polishing and sanding in the future. But this time, it must be illuminated with 100W bulb. Under the development of light, small holes can be clearly seen and repaired in time.

Second, paint, must paint than.

The choice of color needs to use enough materials at a time, so as to ensure that there is no shortage. If mixed later, it is easy to form color difference. It is strictly required not to add excessive water, and excessive dilution will affect the quality and effect of the coating. When the primer is finished, you can brush the top coat for the last time. Make sure there is no damage and bruise after brushing, because the bruise can be partially repaired, plus color difference and scar, you can clearly see that the better the paint, the more scars you will see. For the sake of beauty, there must be no bruises.

Precautions:

1, putty material selection

The performance and technical requirements of the materials used in putty are as follows: carboxymethyl cellulose: white floc, which has strong hygroscopicity and is easily soluble in water, and mainly plays a role in improving the viscosity of putty.

Dabai: There are two kinds: lump and powder. Dabai requires pure white color, and the fineness is required to pass the 8O mesh sieve.

Gypsum: White powder of plaster of Paris is used, which is an airtight cementing material. Don't be affected with damp and rain, and it is forbidden to use gypsum that is affected with damp and caked.

Talcum powder: soft, greasy and light.

Polyvinyl acetate emulsion (emulsion for short): This emulsion is used to prevent other materials from settling, prevent putty from falling off and improve the workability of putty.

2, blow be bored with child construction process

Blow be bored with child construction process, according to the different points at the grass-roots level are as follows:

The technological process of scraping putty on concrete wall is as follows: base treatment-base repair-brushing caustic soda water solution-coating adhesive (slurry)-scraping putty-repairing and polishing-putty survival.

The technological process of putty scraping on the joint between concrete floor and building floor is as follows: base treatment-base repair-brushing caustic soda solution-coating adhesive (slurry and glue)-scraping putty-repairing and polishing-putty survival.

The technological process of plastering cement mortar on the grey surface of paper reinforcement is as follows: basic treatment-coating adhesive (juice pulp)-scraping white putty-repairing and polishing-putty survival.

3, blow be bored with child operation points

According to the technological process, it is described as follows:

Grass-roots treatment: For cast-in-place concrete wall, due to various reasons such as floor, material, heat preservation agent, etc., the flatness of the wall is poor, and there are often phenomena such as porosity, honeycomb, pits, uneven angle of yin and yang, arching and so on. Therefore, it is required that the convex part should be scraped flat and the concave part should be filled. For precast concrete floor slab and slab joint base, the floating sand, bumps, dust and other impurities on the surface must be removed by special personnel with wire brush. The grey surface of cement mortar paper reinforcement requires the surface base to be dry, solid and clean (no floating soil and oil stain).

Repair of base course: after the joints of concrete roof panels are cleaned, the gypsum putty shall be leveled and compacted with a steel scraper for the parts with large defects such as honeycomb, and leveled and erected horizontally (the top surface with smooth surface is not required to be scraped). The proportion (weight ratio) of gypsum putty is gypsum: emulsion: cellulose aqueous solution (concentration 5%) = 100: 5 ~ 6: 60.

Brush caustic soda solution: brush twice with 5% caustic soda solution and once with 10% concentration. Rinse with clear water immediately after brushing, and then proceed to the next process after drying.

Coating adhesive (juice slurry): spray a layer of adhesive before scraping putty, which must be uniform. The proportion (weight ratio) of the adhesive that does not leak is clear water: emulsion = 100: 15 ~ 20.

Scraping putty: Scrape putty back and forth with a steel scraper. Pay attention to the top, bottom, left and right. The space between the two scrapers should be clean, and floating putty is not allowed. When scraping putty, it is necessary to prevent it from being stained with or mixed with sand.

The proportion (weight ratio) of white putty is: white powder: talcum powder: cellulose solution (concentration 5%): emulsion = 60: 4o: 75: 2 ~ 4.

Repair and polishing: After the putty is scraped, the first repaired part should be re-inspected. If there is any problem, the collapsed part should be repaired and leveled with putty. After the putty is dry, it should be polished, smoothed and swept with sandpaper.

Survival of putty: scrape the putty twice, and scrape it again after the first putty is dry. It is generally required to survive at least twice. It is required that the surface is not only flat, but also uniform in texture and texture, otherwise it is easy to have inconsistent colors and affect the decoration effect.

Matters needing attention in acceptance of putty scraping

The first step is a big inspection.

Case 1: Cement wall. Comprehensively check whether the cement wall to be painted in the blank room is solid and flat. If the plastering layer on the wall is not firm enough or there are big cracks and holes, it is suggested to complain to the developer or property and ask them to redo it. If individual holes are repaired by themselves, they can be filled with gypsum. If the wall flatness is poor (the error is greater than plus or minus 5mm), gypsum leveling should be considered first.

Case 2: putty wall. Be sure to check whether the wall putty is qualified waterproof putty, if not, be sure to shovel off the waterproof putty again. Other projects are the same 1.

1 Checking whether the wall surface is solid and flat is a step to check the house. To see if the wall is solid, the simple inspection method is as follows: find a hard object (such as a key, screwdriver, etc.). ) and draw a line on the wall to see if there is any slag. There is no shortcut to find cracks and loopholes, only care+patience.

It is generally not recommended to scrape putty and brush paint in kitchen and bathroom, and it is best to stick tiles. Tiling is also a science, which will be discussed later.

Theoretically, the water-resistant putty has been scraped when the new house in Beijing is delivered, but whether the water-resistant putty is "water-resistant" still needs to be tested. The test method is also relatively simple. Sprinkle some water on the wall and wipe it with your hands or a wet rag to see if it will get white ash. If it is, the wall will definitely fail. Do it after shoveling. After this pass, we should not take it lightly, but also look for holes and cracks. If there is, it is best to shovel off the problematic wall and check the causes of holes and cracks.

In wall foundation decoration, "leveling" is a very important work and the basic purpose of decoration. In some residential areas, the flatness of local walls is very poor, so it is necessary to level them with gypsum alone first. Generally speaking, when the wall flatness is greater than plus or minus 8mm, separate leveling needs to be charged separately. If this level is not reached, it should be included in the normal wall construction cost.

Generally speaking, there is an extra charge for shoveling walls. The specific situation is related to the difficulty of shoveling the wall, and there is no uniform standard.

Finished product protection. There will be dust when the wall is treated, and it is inevitable that putty, paint or other glue will drip, so we must do a good job in protecting the finished interior decoration products in advance.

The protection work is listed as a separate step in order to increase everyone's attention to it. Don't leave any regrets because of carelessness, especially when there are some dirt-resistant decorations at home. There are too many posts in the forum asking about cleaning methods!

Step 3 Preparation before putty scraping/plastering. Ensure that the wall surface is solid and flat, and clean the wall surface with steel brush or other tools, so that the cement wall surface has no floating soil and floating subsidence as far as possible. Roll the concrete interface agent on the wall as evenly as possible (some walls may need to be pasted), and after it is dried (generally more than 2 hours), putty/gypsum can be scraped.

1 application of interface agent: seal the base to prevent putty from appearing problems due to loose, floating soil or over-dry cement wall, and its surface is more suitable for putty adhesion than cement wall. Generally, the team in Beijing will roll the interface agent on the original wall before the next step, which can prevent many problems caused by the wall foundation.

If you don't plan to brush the interface agent, you must pay attention to the following words: construction in summer, the wall is dry, and clean water should be rolled before construction to prevent the putty from appearing pinholes or cracks due to excessive water absorption.

3 New cement walls (such as plastering by developers) can only be plastered after the 28-day curing period of cement, otherwise putty bubbles will easily appear and the strength will be insufficient.

4 Sticking cloth (kraft paper): The main function is crack resistance, and the cost is high, so it is not necessary to do it on the general wall. But for thermal insulation wall, loose wall and cracked wall, the pasting effect is obvious and can be considered. If the cloth has been pasted, there is no need for an interface agent, and the functions of the two have already overlapped.

Step 4: Scrape putty (please choose waterproof putty). Before blowing putty, measure the flatness of the wall (with a measuring ruler of more than 2m) to determine the method of blowing putty. Generally, putty can be scraped twice on the wall, which can level and cover the background color. Putty with poor flatness needs to be scraped several times locally. If the flatness is extremely poor or the wall is seriously inclined, you can consider scraping the leveling gypsum first, and then scraping the putty. The interval between each batch scraping of putty should be more than 2 hours (after the surface is dry).

Choose a water-resistant putty for 1: 82 1 is a putty whose use is restricted. It is waterproof, unstable and easy to peel and crack. Many workers often add white latex, 108 glue and other glues to increase the firmness of 82 1, leaving hidden dangers to health. Water resistant putty does not have the above risks. Strong, waterproof, can be used without any glue after adding water, and does not need to be eradicated after long-term use (10-20 years). It is a product that can truly benefit from one construction for a long time.

Water-resistant putty should not be scraped too thick in this construction, otherwise it will crack when it is dry, which is a fly in the ointment. So when the flatness is poor, it needs to be constructed many times, and even the thick bottom is plastered first.

3 when preparing water-resistant putty, it should be prepared according to the ratio of powder: water = 2: 1. Stir with an electric drill first, and then let it stand for about 10 minutes. Then fully stir with an electric drill, and it can be used at this time.

4 Leveling gypsum: Strictly speaking, leveling gypsum is also a kind of putty, but its main component is gypsum, and its surface is rough, which is suitable for leveling with a thick bottom layer. The single leveling thickness can reach about 5 mm A good leveling gypsum must be a product with certain water resistance and higher bonding strength than water-resistant putty. Only in this way can we ensure that there will be no problems in long-term use. The construction methods of gypsum and putty are similar, the only difference is that gypsum can be used once, and the drying and curing speed is faster.

Step five, polish the putty. After the water-resistant putty is fully strengthened (5-7 days), it will become extremely strong, and it will become extremely difficult to polish it at this time. Therefore, it is suggested that putty grinding should start 1-2 days after putty scraping. Polishing can be carried out at night, with a bulb of more than 200 watts close to the wall for lighting (also use a bulb for leveling during the day), and check the flatness while polishing.

There will be a lot of dust when polishing putty. Please prepare masks for the people present. Although putty is non-toxic and harmless, dust is not a good thing, so attention should be paid to prevention.

Step 6: Brush the primer. After the floating dust on the polished putty surface is cleaned, it can be primed. Primer can be brushed once, and it must be uniform. After drying (2-4 hours), the next step can be carried out.

1 Primer: Primer is similar to concrete interface agent, but it can save some topcoat besides providing good adhesion. Nowadays, the pace of life is fast, and many families often wait until the putty is completely dry and the alkalinity disappears (5-7 days) before painting. At this time, it is even more necessary to brush a layer of alkali-resistant primer to seal the alkalinity of water-resistant putty (which is another defect of water-resistant putty), otherwise the paint is prone to problems, especially the color paint, which will have uneven color like the picture.

Whether the primer needs to be mixed with water can refer to the instructions of the purchased primer, and so on.

Step 7: Brush the top coat. Generally, the top coat is brushed twice, and the interval between each time should be more than 2-4 hours (depending on the surface drying time) until it is basically dry. It takes 1-2 days for the paint to completely dry after the second coating. Before the paint is completely dry, pay attention to waterproof, drought-proof and sun protection to prevent problems with the paint film. ：

1 Brush coating method: roller coating and spray coating have their own advantages and disadvantages. The surface of roller coating film has a natural texture and consumes less paint. The surface of sprayed paint film is fine and smooth, but it consumes more paint. The specific choice can be determined according to personal preference and economic ability.

2. Water addition: Most latex paints are sticky after opening, so it is usually necessary to add some water for better construction. The specific water content of each paint is different, but it does not exceed 30% at most. It should be noted that the color paint must be carefully mixed with water, otherwise it is easy to have uneven color.

Accept. Survival metope should be solid, flat, vertical, Yin and Yang, no cracks, no holes, uniform color, full paint film, but also pay attention to check the protection of finished products.