Updated 1 June 2026
Wall Preparation Before Wallpapering: What Actually Matters
Wallpaper needs a sound, dry, evenly absorbent wall: old paper stripped back, cracks filled, and new plaster left to dry at least four weeks. Skipping preparation is the single most common cause of wallpaper failing — bubbling or seams lifting — within months of hanging.
What preparation actually involves
Old wallpaper comes off completely, not just the loose bits — paper hung over old paper telegraphs every seam and bubble through to the new surface.
New or repaired plaster needs to be fully dry before anything goes up — usually a minimum of four weeks per coat, longer in an unheated room over winter. Papering over damp plaster traps moisture and the paper lifts within weeks.
Lining paper, hung horizontally, gives a stable and evenly absorbent base for a heavy non-woven paper and is worth the extra day on any wall that's had multiple past layers or repairs.
Signs a wall isn't ready
Any of these mean the wall needs more prep, not less: emulsion that's flaking or chalky to the touch, visible damp staining, hairline cracks that haven't been filled, or a noticeably cold, damp patch (often a sign of an external wall issue rather than the paper's fault).