Can you apply joint compound over wallpaper?

In this article, we will explore this question and provide you with all the necessary information to make an informed decision.

Understanding Joint Compound

Before we dive into the topic, let’s understand what joint compound is and how it is typically used. Joint compound, also known as drywall compound or mud, is a plaster-like compound used for finishing drywall joints and covering seams or imperfections. It is commonly applied to walls and ceilings to create a smooth and even surface before painting or wallpapering.

The Cons of Applying Joint Compound Over Wallpaper

While it may be tempting to skip the wallpaper removal process altogether and cover it up with joint compound, there are several cons to consider:

1. Adhesion Issues: Joint compound is designed to adhere to a clean, solid surface. If there are layers of wallpaper, it may not bond properly, leading to cracking and peeling.
2. Uneven Surface: The texture and thickness of joint compound may not be able to fully cover the patterns or textures of wallpaper, resulting in an uneven finish.
3. Moisture Problems: Wallpaper can act as a barrier, preventing the normal movement of moisture through the wall. By covering it with joint compound, you may trap moisture, leading to mold growth and other issues.
4. Difficult Removal: If you ever change your mind and decide to remove the wallpaper or update your walls, you will be faced with the challenging task of removing joint compound from the surface.

The Proper Way to Remove Wallpaper

While it may require some time and effort, removing wallpaper properly is usually the best course of action. Here are the steps to follow:

1. Prepare the area: Move furniture and cover the floor with drop cloths. Remove any wall hangings or outlet covers.
2. Test the wallpaper: Start by testing a small area of the wallpaper. Use a putty knife or scraper to lift a corner and try to peel it away. If it comes off easily, you may be able to remove the wallpaper without using any additional methods. However, if it is difficult to remove, move on to the next step.
3. Apply a wallpaper removal solution: There are various commercial wallpaper removal solutions available in the market. Follow the instructions provided on the product and apply it to the walls. Let it soak in and work its magic.
4. Scrape off the wallpaper: Once the wallpaper has softened, use a putty knife or scraper to gently scrape it off the wall. Be careful not to damage the underlying surface.
5. Rinse and clean: After removing the wallpaper, thoroughly rinse the walls with clean water to remove any residue. Allow the walls to dry completely before proceeding with the next step.
6. Repair any damages: Inspect the walls for any damages, such as holes or scratches. Use a joint compound or spackling paste to fill and repair these imperfections. Sand the patched areas smooth once they have dried.

Considerations for Applying Joint Compound Over Wallpaper

If removing the wallpaper is simply not an option or you are looking for a temporary solution, there are a few things to consider before applying joint compound over wallpaper:

1. Testing Adhesion: Before committing to a full application, test the adhesion of joint compound on a small inconspicuous area. Apply a thin layer of joint compound and see if it adheres properly. If it does not bond well, it is not recommended to proceed.
2. Surface Preparation: Proper surface preparation is crucial for any successful application. Ensure that the wallpaper is clean, free from any loose edges, and well-adhered to the wall. Sand down any textured areas to create a smoother surface.
3. Thin Layers: Apply joint compound in thin layers, allowing each layer to dry completely before adding another. This will help reduce the risk of cracking or peeling.
4. Prime and Paint: Once the joint compound is applied and dried, it is essential to prime the surface before painting. A primer will help seal the joint compound and provide a proper base for paint.

While it may be tempting to cut corners and simply apply joint compound over wallpaper, it is not recommended for a long-lasting and professional finish. Properly removing the wallpaper and preparing the surface will yield the best results. However, if removing the wallpaper is not an option, proper testing, preparation, and application techniques can help achieve a satisfactory outcome. As with any home improvement project, take your time, consider the pros and cons, and choose the method that best suits your needs.