Today, wallpaper has become a popular choice in home decoration. Before applying wallpaper, it's important to properly prepare the walls. If the wall has been exposed for too long, it's recommended to use a mold inhibitor to prevent mold growth. Additionally, if the wall behind the wallpaper is a bathroom, the interior walls must be treated with a waterproofing agent. Otherwise, prolonged moisture can cause the wallpaper adhesive to lose its effectiveness and lead to peeling or damage over time.
Before pasting the wallpaper, the wall surface should be smooth, clean, and free of dust. Any irregularities or cracks should be removed using a blade, then filled with putty and sanded after drying. For large areas, it's best to mix old powder with cooked rubber powder to strengthen the wall. For small gaps, use gypsum powder mixed with some oil to create a suitable filler. After the wall is prepared, apply two coats of varnish to protect it from moisture. Once dry, gently sand the surface. Avoid applying too much oil, as this can make the wall too smooth, leading to poor adhesion and potential shrinking, which may result in visible seams.
The main process for applying wallpaper on a plasterboard surface includes: cleaning the wall, filling gaps, sanding, sealing seams, applying putty, sanding again, brushing a primer, marking lines, applying adhesive, pasting the wallpaper, aligning patterns, pressing out air bubbles, cleaning excess glue, and trimming any excess material.
Before pasting the wallpaper, proper wall preparation is essential. The wall should be smooth, dry, crack-free, and free of dust. If the wall is made of cement or brick, use putty to level the surface and apply a thin coat of varnish once it's dry before attaching the wallpaper. For gypsum board surfaces, fill any seams first and then apply a layer of joint compound.
Applying a seal coat and primer helps cure and protect the putty while enhancing the wallpaper’s resistance to alkali. These steps are similar to preparing walls for painting, so a painted wall can also be converted into a wallpapered one, provided it's sanded properly.
According to the National Standard for the Acceptance of Quality of Building Decoration Engineering (GB50210-2001), the base treatment must meet specific requirements before applying wallpaper. This includes removing loose materials from old walls, applying an interface agent, and treating new concrete or plaster walls with an alkali-resistant primer before applying putty. The base surface should have consistent color, with moisture content not exceeding 8% for concrete or plaster, and 12% for wood. The flatness, verticality, and angles of the base must meet the standards set by the "Code for the Acceptance of Quality of Building Decoration Engineering." A seal coat should be applied before pasting the wallpaper, and the putty must be firm, non-powdery, and free from peeling or cracking, meeting the standards outlined in "Building Interior Putty."
Lastly, it's important to consider the environmental impact of the wallpaper adhesive used. Choosing eco-friendly options can help maintain a healthier indoor environment.
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