Can You Wallpaper Over Existing Wallpaper?
The four conditions old paper has to meet, how to test it in five minutes, and why paste moisture lifts both layers when you get it wrong
Only if the old paper is flat, smooth, non-vinyl and firmly stuck down everywhere. If it fails any one of those four, take it off. The moisture in fresh paste soaks through and reactivates the old adhesive, and both layers come away together, usually two or three days after you have finished.
The honest answer is that stripping is nearly always the better decision. But there are walls where papering over is genuinely fine, and this is how to tell which one you have.
The four conditions
- Flat. No embossing, no relief, no woodchip, no texture of any kind.
- Smooth. No lifted seams, no bubbles, no patched repairs standing proud.
- Non-vinyl. Paste will not bond to a vinyl or coated surface.
- Firmly stuck. Everywhere, not just in the middle of the wall.
How to test it
- Lift a corner at the skirting with a filling knife and pull gently upwards. If it starts to come, it will keep coming.
- Run a thumbnail along a seam. Any seam that lifts, anywhere in the room, means the whole wall is suspect.
- Press your palm across the wall. Hollow-sounding areas are already lifting behind the surface.
- Check for vinyl. Dab a damp cloth on an offcut area. Paper darkens as it absorbs; vinyl beads the water and stays dry.
- Do this on every wall. Rooms are often papered at different times, and the wall behind a wardrobe is rarely the same age as the rest.
Take it off if
- It is vinyl or coated
- It is textured, embossed or woodchip
- It is dark or strongly patterned, and your new design is pale, so the old pattern will shadow through
- It is lifting, bubbled or peeling anywhere at all
- It is more than one layer thick
- It has been painted over
- It is in a kitchen or bathroom, where the old adhesive has been through years of steam
Why it fails when it fails
New paste puts water onto the back of the old paper. Old wallpaper adhesive is water-soluble, so it softens, and the weight of a freshly pasted length pulling on a softened bond is enough to let go. The failure is rarely immediate. It happens as the wall dries, which is why people find bubbles and lifting a few days after finishing rather than on the day.
The other failure is slower and more annoying: any texture, seam or patch in the old paper telegraphs through the new one within a week as it dries and shrinks onto the surface.
If you are going to paper over it
- Wash the old paper down with a barely damp cloth and let it dry completely. Do not soak it. You are cleaning it, not stripping it.
- Cut out and re-stick any lifted seams with a fine brush and a little adhesive, then let them dry fully.
- Fill and sand any damage, feathering the repair so it does not stand proud.
- Offset your new seams so they do not fall directly over the old ones. Two seams stacked on top of each other is where a ridge shows.
- Work quickly and use no more paste than you need, so less water goes through to the layer below.
What this does to the next person
Worth saying plainly: papering over paper makes the next removal harder, because two layers have to come off and the top one shields the bottom one from water. If you are staying, that is your problem to inherit. If you are preparing to sell, strip it.
Can you wallpaper over wallpaper?
Only where the existing paper is flat, smooth, non-vinyl and firmly stuck throughout. Otherwise it should be removed.
Can you wallpaper over vinyl wallpaper?
No. Paste will not bond to a vinyl or coated surface.
Can you wallpaper over woodchip?
No. The texture reads straight through the new paper.
How do I know if my wallpaper is vinyl?
Dab it with a damp cloth. Paper absorbs and darkens; vinyl beads the water.
Will the old pattern show through?
If it is dark or strongly patterned and your new design is pale, yes.
Is it ever worth papering over rather than stripping?
On a flat, non-vinyl single layer in good condition, yes, because it saves a day of wet work. In every other case, stripping is the better decision.
