A safe way to determine if your new wallpaper can be applied over the old paper is to see if you can tell what kind of wallpaper is currently on the wall.
Can i paper over vinyl wallpaper.
Vinyl is nonporous so new wallpaper will not stick to it and adding a layer on top of it will create mold.
In most cases non coated paper can be wallpapered over.
Homeowners can tell if it is a true paper by using a sponge.
True paper papers are generally high end products or are made overseas.
The only wallpaper that is nearly guaranteed not to cause you residual problems if you leave it on the walls is non coated wallpapers.
There are two types of wallpaper.
However vinyl coated paper cannot be wallpapered over.
If the vinyl rips off in strips loosen another corner with your scraper and continue pulling until you have removed the entire top layer of wallpaper.
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If the existing wallpaper is firmly adhered to the walls and has a smooth texture free from any embossing raised embellishments or flocking you can add a fresh layer of wallpaper over the old.