- It's important to know the level of expertise the installers have to ensure a high-quality finish. 2. **What types of wallpaper materials do you work with and are there any materials you recommend or discourage using?

- It's important to know the level of expertise the installers have to ensure a high-quality finish. 2. **What types of wallpaper materials do you work with and are there any materials you recommend or discourage using?