Today, wallpaper has become a popular choice for home decoration. Before applying the wallpaper, it's important to properly prepare the wall. If the wall has been exposed for too long, it's advisable to treat it with a fungicide to eliminate any mold. Additionally, if the adjacent room is a bathroom, the interior walls must be treated with a waterproofing agent. Otherwise, prolonged moisture can weaken the adhesive and cause the wallpaper to lose its grip over time.
Before pasting the wallpaper, the wall surface should be clean, smooth, and free of imperfections. Any uneven areas or cracks should be removed using a blade, and then filled with putty. Once dried, sand the area to ensure a flat finish. For large areas, it’s recommended to use old powder mixed with cooked rubber powder to strengthen the wall surface. For smaller gaps, a mixture of gypsum powder and oil can be used as a filler. To further protect the wall, two coats of varnish are usually applied, which helps in moisture resistance. After drying, lightly sand the surface with fine sandpaper. Be careful not to apply too much oil, as this can make the wall too smooth, leading to poor adhesion and potential wrinkles when the wallpaper dries.
The main steps for applying wallpaper on a plasterboard surface include: cleaning the wall, filling gaps, sanding, sealing seams, applying joint compound, sanding again, brushing a primer, marking lines, applying adhesive, pasting the wallpaper, aligning the seams, pressing out air bubbles, removing excess glue, and trimming any excess material.
Before pasting the wallpaper, the wall treatment must meet certain standards. The surface should be smooth, dry, crack-free, and solid. Dust should be completely removed. For cement brick walls that are relatively flat, you can apply putty and then a thin coat of varnish before pasting the wallpaper. However, if there are seams on the gypsum board or other surfaces, those should be filled first with joint compound.
Applying a seal coat and primer serves to cure and protect the putty, while also enhancing the wall’s resistance to alkalinity. This step is essential, especially for wallpaper installation. Painting should only be done after the putty is fully dry. The process of preparing the wall for wallpaper is similar to painting, so walls that have already been painted can be converted into wallpapered surfaces, but they need to be sanded first to ensure proper adhesion.
According to the National Standard for the Acceptance of Quality of Building Decoration Engineering (GB50210-2001), the base treatment must meet specific requirements before pasting the wallpaper. First, any loose old materials on an existing wall should be removed, and an interface agent should be applied. For new concrete or plaster walls, an alkali-resistant primer should be applied before putting on the putty. The base surface color should be consistent, with moisture content not exceeding 8% for concrete or plaster, and 12% for wood. The wall should also be flat, vertical, and have well-defined corners as per the building code. A seal coat should be applied to the base layer, ensuring that the putty is smooth, firm, and free from dusting, peeling, or cracking. Finally, always consider the environmental impact of the wallpaper adhesive used, choosing eco-friendly options where possible.
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