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In the impression of many people, wallpaper is easier to lay than paint. It's OK to keep the wall flat and clean, but it's not

in the impression of many people, wallpaper is easier to lay than paint. It's OK to keep the wall flat and clean, but it's not. It is understood that the laying of wallpaper has a lot to do with the substrate. Different substrates need to be treated differently, and many details need to be paid attention to in the treatment. Do you want to paste wallpaper? It may not be as easy as you think

don't paint new houses

the paint of old houses needs to be tested first. The hollowing of old wallpaper should be removed. Pay attention to crack proof wooden substrate and beware of deformation. The substrate should meet 7 requirements

for wallpaper, if the materials are different, the treatment methods to be taken are also different. If wallpaper is laid on the wall of the new house, the base treatment is the simplest. The procedure is the same as that of the foundation wall construction, except that the paint is not applied, that is, the interface agent is normally applied on the plastering layer, and then the putty is applied for 2-3 times. Then you can decorate other Tilers, oilers, etc. and lay wallpaper on the wall when it is finished

the paint of the old house needs to be tested first

if the original wall is painted with paint and you want to renovate the wall, is it OK to directly lay wallpaper on it? In response to this problem, experts said that if it is the wall of an old house, some judgment is needed. If the original coating is relatively tight and does not fall off, you can directly brush the base film on it (the necessary material for pasting wallpaper, which can firm the wall, increase the adhesion of wallpaper, and protect the wall when dismantling), and directly lay the wallpaper. However, if the original coating is unstable, the original substrate needs to be removed

how to determine whether the original paint needs to be eradicated? The owner can test the paint by himself. Take a wet towel dipped in water (it's better not to bubble the floor), fix it on the wall in some way, and check it the next morning. If there is no peeling and falling off on the wall, it means that the wall base is well treated, and the combination is still very tight. You can directly brush the base film on it and pave any wallpaper

if the wall surface bubbles and falls off, it indicates that the wall base is unstable. If the wallpaper is directly paved at this time, the wall adhesion is relatively low, and the wallpaper is easy to fall off. If all the walls are unstable, it is necessary to uproot all the walls, Shovel them to the plastering layer, brush the interface agent again, and apply putty

if only part of the wall base is unstable, it is only necessary to remove part of the base, re brush the interface agent and apply putty. After completing this part of the process, the whole wall should be marked out with a wallpaper knife. Generally speaking, the deeper the scratch is, the denser the small square is, the better. "Because the original base is relatively smooth and the adhesion is relatively poor, this method can connect the front and rear putty, ensure the stability of the base and reduce the possibility of wallpaper cracking."

empty old wallpaper should be eradicated

what should be done if the original wall is paved with wallpaper? Can I put a new wallpaper directly on the original wallpaper? Experts said that this should also be treated separately according to the situation. Generally speaking, because the original base is not necessarily dense, it may cause the wallpaper to fall off after paving. There is a great risk of paving the wallpaper directly on the original wallpaper. It is necessary to remove all the original wallpaper, and use the above method of detecting the paint base to check the base to see whether it is necessary to further eradicate the putty layer. The subsequent work is consistent with the "old house paint needs to be detected first"

of course, there are exceptions. If the original wallpaper is of special purity, such as the wallpaper of high-purity wood pulp, soak a wet towel in water and put it on the wallpaper. After more than ten minutes, check whether there is hollowing. If there is still no hollowing, you can directly lay any wallpaper on it. If there is an empty drum, you need to remove all the wallpaper and carry out the next step of substrate inspection and treatment

pay attention to crack prevention of gypsum base

if the base of the original wall is gypsum board, you need to pay attention to moisture-proof treatment. The first step is to apply antirust paint on all self tapping screws to prevent rust from corroding the wallpaper; Then, the joints of the gypsum board are filled with white latex and gypsum powder to prevent cracks caused by gypsum shrinkage. Experts emphasize that gypsum powder is used here instead of putty, because gypsum powder and gypsum are of the same material and have the same expansion and contraction coefficient. If putty is used, different contraction coefficient will also lead to cracking

in order to ensure no cracks, it is also necessary to stick bandages on the joints after the gypsum powder is dry. Generally speaking, there are dacron cloth, kraft paper and mesh gauze at present. Due to the large gap and weak adhesion of mesh gauze, it is rarely used at present. After the cloth is pasted, polish and scrape the putty, and then lay the wallpaper normally

beware of deformation on the wooden base

what should I do if I need to lay wallpaper on the wooden board? First of all, you need to brush a thin layer of paint on the wooden plate to prevent the wood from being damp and deformed. Where there is a gap, use atomic ash instead of gypsum powder to fill the gap. "Because atomic ash has high hardness and strong stability, there is no problem of shrinkage and expansion."

the next step is to apply putty. Make putty with white emulsion and water in the ratio of 1:1, and brush a thin layer. "To be as thin as paper is actually to flatten the uneven parts of the wooden board." The putty layer also needs to be able to stick to the wooden plate, which is easy to cause the wallpaper to fall off if it is not strong. After sanding with sandpaper, apply a thin coat of paint (solvent or water-based paint can be used) to prevent wood deformation from causing problems with the wallpaper. After finishing these works, you can carry out the normal wallpaper laying work

the substrate needs to meet seven requirements

experts say that no matter what the material of the substrate is, if you want to lay wallpaper, you generally need to meet the following seven standards:

1 smooth. You can use a 2-meter-long ruler, or shine a flashlight on the wall, and look along the light. If there is no obvious unevenness, you can

2. It has a certain bearing capacity. Here, you can scratch the putty with your fingernails. If you can't scratch it off; Or stick it on the putty layer with self-adhesive. If the tape is removed and the putty is not scraped off, it indicates that the putty has a certain bearing capacity and is qualified

3. Water absorption is reasonable. If water splashes on the wall, if the wall becomes wet, it is between splashing water on the glass and being sucked in when splashing water on the sponge

4. PH value is neutral. Use pH test paper, which is neutral

5. The surface should be clean and the color should be consistent

6. Smooth. Different wallpaper products have different requirements for smoothness, but they need to meet the requirements of all kinds of wallpaper

7. dry. Generally speaking, the moisture content of wooden boards should not exceed 8%, and the moisture content of walls should not exceed 12%




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