Does old wallpaper need to be removed?
No, not always. If it is in good shape and adhering properly with smooth edges and seams then probably it can be papered over. If you intend to paint over the paper it is best to try and remove the paper. If it does not want to come off easily then it may be primed and textured a little to match existing walls. Removal of wallpaper depends on the glue used and the number of times the wall has been papered. There are commercial removers. These products must get through the surface to the paste or they are ineffective. Most often a wet beech towel tacked over the surface helps along with pricking the surface everywhere to let the solvent in and under. Commercial rollers to perforate the surface are available. Having wallpaper professionally removed can be rather expensive. Again, depending on the glue. Most new wallpaper is applied with primers to make it easier and less troublesome to remove. Old papers can be difficult.
