What is the primary purpose of treating a surface before installing wall coverings?

• A. To ensure the substrate is completely smooth and properly sealed
• B. To color the surface
• C. To add texture
• D. To reduce humidity

Answer: (A)

Surface preparation for wall coverings focuses on making the wall ready to receive a finish by creating a smooth, sealed substrate. When the surface is flat and non-porous, the adhesive can bond evenly, and any irregularities won’t telegraph through the wallpaper or coating. Smoothing out bumps, filling cracks, and sealing porous areas reduce the risk of bubbles, lifting, or uneven edges, leading to a durable install with a clean, uniform appearance. Coloring or adding texture isn’t the aim of this step, and while managing humidity is important for conditions during installation, it isn’t the primary purpose of treating the surface itself.