You see, if the wall is pasted just one step wrong, there will be troubles one after another in the future. When many people put up wallpaper for the first time, they don't even know that the wall needs to be treated first. As a result, half a year later, the wallpaper turns yellow and has warped edges. They have no choice but to tear off the wallpaper and put it up again, thus wasting thousands of dollars.
What exactly is wallpaper base film?
There is a material specially used to treat walls. It is called wallpaper base film. When it is applied to the wall, it will form a transparent protective film. This protective film can isolate alkaline substances and moisture in the wall, thereby protecting the wallpaper from damage.
In 2025, data presented by the China Building Decoration Association showed that more than 60% of wallpaper quality problems were caused by improper wall treatment. When many families are renovating, in order to save money and trouble, they directly paste wallpaper on the cement wall. However, the result is that yellowing occurs after three months. Mr. Wang, who is located in Chaoyang District, Beijing, is a typical example of this. His home was renovated in March 2025, and instead of painting the base film, he directly put up wallpaper. By August, the wallpaper had become moldy on a large scale, and he had to spend 2,800 yuan to re-construct it.
After painting, you should also brush the base film
Many people think that since the wall has been painted with latex paint, there is no need to paint the base film again. This idea is wrong. Painted walls instead require base film to be treated. The surface of the paint is smooth and has many chemical components. If you apply wallpaper directly, it will not stick well at all.
In 2025, a Shanghai decoration supervision company showed statistics that if wallpaper is directly applied to a painted wall, the probability of peeling off within a year is as high as 75%, because the alkaline substances contained in the paint will also penetrate, causing the wallpaper to turn yellow. Ms. Li from Guangzhou renovated in early 2025. She thought that after applying Nippon Paint, there was no need to use base film. However, the result was that the wallpaper warped and fell off in less than half a year, and it cost another 4,500 yuan to re-attach it.
How to calculate the amount of base film
Haobanggong wallpaper base film can cover an area of 8 to 10 square meters per kilogram, and only one brushing is enough. This amount is calculated based on standard wall surfaces, and the actual amount depends on the condition of the wall and construction techniques.
Master Zhang, who has been engaged in the decoration industry in Chengdu for 15 years, is a decoration master who specializes in wallpapering. He gave this suggestion, that is, when purchasing base film, you should calculate 10% more amount, because the wall surface is rough or the water absorption is relatively strong. The amount will be higher. More, for example, if there is a wall with an area of 30 square meters, according to the standard calculation, 3 to 4 kilograms of base film are needed. However, during the actual construction, it will be safer to prepare 4.5 kilograms of base film to avoid insufficient use in the middle of the construction.
The consequences of not brushing the base film are serious
Whether it is a cement wall or a putty wall, there are alkaline substances that will corrode the back of the wallpaper over time. Once the wallpaper gets damp, it will breed mold and produce an unpleasant odor, which will affect the health of your family and affect your family's health.
Ms. Liu was in Hangzhou. During the renovation in 2025, the base film was not painted. Until January 2026, the wallpaper in the children's room was covered with black spots, and the child coughed frequently. Later, tests determined that the mold on the back of the wallpaper exceeded the standard by 20 times. She had no choice but to tear off all the wallpaper in the entire house and process the walls again, which cost a total of more than 8,000 yuan. This instruction made her regret not following the decoration master's suggestions.
Base film construction is actually very simple
Use a roller to roll the base film evenly on the wall, just like painting. After brushing, wait two to four hours until it is completely dry, and then you can put wallpaper on it. Before construction, the wall must be cleaned to avoid dust and oil.
The construction records presented by the Xi'an decoration company in 2025 show that the process of brushing the base film only accounts for 5% of the total construction time, but it can solve 80% of the problems that arise later in the wallpaper. The cost of the base film is also very low, only a few dollars per square meter. Compared with the cost of reposting the wallpaper after it is damaged, this investment is extremely cost-effective. Mr. Zhao from Chongqing personally applied the base film, and it only cost 200 yuan in materials for a 60-square-meter house.
Choose the right base film to get twice the result with half the effort
Among the base films on the market, their quality shows great differences. The solid content of Haobang's base film is more than double that of ordinary products, and the reinforcement and moisture-proof effect is superior, which is more beneficial. During the purchase process, you need to check the product test report. Do not buy low-quality products just because you are greedy for cheap prices, otherwise it will bring adverse consequences.
The Shenzhen Consumer Council conducted a spot check in 2025. The targets of the spot check were 15 wallpaper base films. It was found that products with prices below 30 yuan per kilogram were found. Eight of these products failed to meet moisture-proof standards. Even if unqualified base films were used, problems would still occur on the wall. The decoration supervisor gave advice. When buying base film, you need to look at the brand. Although professional brands such as Haobanggong are more expensive, they can guarantee that there will be no problems for more than 10 years. Whether the wallpaper is applied well depends on whether the base film step is done correctly.
When your home was being renovated and the wallpaper was being put up, did the master remind you to apply the base film first? You are welcome to share your decoration experience in the comment area. If you think this article is of practical value, please like it and forward it to friends who are in the process of decoration for viewing.
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