Quick answer
To remove wallpaper from plaster walls, test painted layers for lead if the home was built before 1978, then score any painted or vinyl surface lightly and soften the paper with warm water or a steamer. Scrape gently, working one layer at a time, wash off old paste, and repair cracks or loose plaster before priming. Wallpaper Installer Seattle handles removal and wall prep in older homes.
Key facts
- Plaster tolerates water and steam better than drywall, so a wallpaper steamer is often the most effective tool.
- Homes built before 1978 may have lead paint; test before scraping or sanding, and use lead-safe methods if positive.
- Some older plaster and textured coatings contain asbestos; test before sanding or cutting into them.
- Early-1900s wallpaper was often hung over calcimine, a water-soluble paint that must be washed off or sealed.
- Cracks, hollow spots, and loose plaster should be repaired and the wall primed before new wallpaper goes up.
Is it harder to remove wallpaper from plaster than drywall?
It is often easier in one sense and harder in another. Plaster has no paper face to tear, so it can take soaking and steaming that would ruin drywall. But old plaster walls tend to carry more layers, more paint, and more hidden cracks, and those make the job slower.
The original wallpaper in many older homes was hung with starch- or wheat-based paste, which softens readily with warm water. Problems usually come from what happened later: vinyl papers added in the mid-century, paint rolled over paper to "freshen" a room, or newer papers stacked on top of old ones.
Why do older Seattle and Tacoma homes have plaster walls?
Plaster was the standard interior wall finish in the region until gypsum drywall took over in the decades after World War II. Many Seattle neighborhoods developed in the early 1900s, such as Wallingford, Ballard, Capitol Hill, Queen Anne, and Beacon Hill, are full of Craftsman bungalows, foursquares, and Tudor-style homes with plaster walls. Tacoma's North End and Stadium District have similar housing from the same era.
You will usually find one of two systems:
- Plaster over wood lath. Common in pre-1940s homes. Strips of wood behind the wall hold plaster "keys" that lock the plaster in place.
- Plaster over gypsum or metal lath. More common in homes from roughly the 1930s through the 1950s, before drywall was standard.
Either way, the plaster is hard and dense, and it can feel cold and solid when you knock on it. A hollow sound or a soft, crumbly spot is a sign the plaster has separated from its lath and needs attention.
What safety checks are needed before removing wallpaper from plaster?
Test for lead before you scrape anything in a home built before 1978. Lead-based paint was used widely in older homes, and it may be on the walls under the wallpaper, on top of painted-over paper, or on adjacent trim. Scraping, sanding, and steaming painted layers can release lead dust.
- Lead testing. Use an EPA-recognized test kit on each painted layer you can reach, or hire a certified lead inspector or risk assessor for a more complete answer.
- Lead-safe work. If lead is present, contain the area with plastic, use wet methods, never dry sand or dry scrape, clean with a HEPA vacuum, and keep children and pregnant family members away. Federal and Washington State rules require contractors who disturb painted surfaces in pre-1978 homes to be certified in lead-safe practices, so ask any contractor about it.
- Asbestos. Some older plaster, skim coats, and textured finishes contain asbestos. If you plan to sand, cut, or demolish plaster, have it tested first. Popcorn ceilings in older homes should also be tested before they are disturbed.
- Electrical. Older homes often have outlets and switches in plaster walls with aging wiring. Turn off the room's circuits at the breaker before using water or steam, remove the cover plates, and tape over the boxes.
How do you remove wallpaper from plaster walls step by step?
Work from the outside layer in, keeping the plaster damp but not saturated. Here is the process we follow in most older homes:
- Prepare the room. Move furniture, cover floors with plastic and absorbent drop cloths, and protect original trim and built-ins with plastic and tape. Old wood trim is often finished with shellac or varnish that water can damage.
- Dry strip the top layer. Pull off anything that will come off dry, especially modern strippable or peelable papers.
- Break the surface if needed. Painted or vinyl layers block water. A scoring tool used with light pressure opens the surface; plaster is far less likely than drywall to be marked by it.
- Soak or steam. Spray warm water with a wallpaper remover, wait several minutes, and spray again. For multiple layers or painted-over paper, a wallpaper steamer is usually faster. Hold the plate on one spot until the paper softens, then move to the next as you scrape.
- Scrape gently. Use a wide, stiff scraper held at a low angle. Let the steam do the work. Prying hard at the paper can pull loose plaster away with it.
- Repeat layer by layer. Older layers usually release more easily than newer ones because their paste is starch-based.
- Wash the walls. Once the paper is off, sponge away all paste with warm water and remover, then rinse. Repeat until the wall no longer feels slick.
- Let the plaster dry thoroughly. Thick plaster holds moisture longer than drywall, especially during a cool, damp Northwest winter. Give it extra time before repairs or priming.
What if there are several layers of wallpaper or paint over wallpaper?
Multiple layers are normal in older homes, and painted-over wallpaper is one of the most common situations we see. Both are manageable with patience and the right tools.
| What you find | What it means | How to handle it |
|---|---|---|
| Two or more paper layers | Previous owners papered over old paper | Steam and scrape one layer at a time |
| Paint over wallpaper | Paper was painted instead of removed | Test paint for lead, score lightly, then steam |
| Vinyl paper on top | Water-resistant surface blocks moisture | Peel the vinyl face first, then soak the backing |
| Chalky, powdery residue on bare plaster | Possibly calcimine, an early water-soluble paint | Wash it off thoroughly or seal it with a suitable oil-based primer |
| Paper over cracked or patched plaster | Paper may be holding weak areas together | Remove carefully and plan for repairs |
Calcimine deserves a special note. It was common in the early 1900s and stays water-soluble, so new primer, paint, or paste applied over it can peel off in sheets. If wiping the bare wall with a damp sponge leaves a chalky film, deal with that layer before going further.
How do you repair plaster after wallpaper removal?
Most plaster walls need some repair once the paper is off, because wallpaper often hid cracks and patches. The goal is a sound, smooth, sealed surface.
- Hairline cracks. Open slightly with a utility knife, tape with fiberglass mesh, and fill with setting-type joint compound, which is harder and shrinks less than premixed compound.
- Loose or bulging plaster. Reattach to the lath with plaster washers and screws before patching. If large areas are loose, sections may need to be replaced.
- Holes and gouges. Fill in layers with setting compound, then finish with a lighter topping compound for easy sanding.
- Uneven or crazed surfaces. A skim coat, or liner paper for fine crazing, creates a flat base. Our guide to wallpaper on textured walls explains skim coating and liner paper.
- Prime. Seal repairs and the full wall with an appropriate wallcovering primer. See our wallcovering primer guide for choosing one.
Remember that sanding any plaster or painted surface in an older home should only happen after lead and asbestos testing.
Should you hire a pro to remove wallpaper from plaster?
For a single layer of strippable paper on sound plaster, a careful homeowner can often do it. For multiple layers, painted-over paper, possible lead paint, or walls with visible cracks, professional help usually saves time and protects the plaster.
Our wallpaper removal service pairs with wall preparation for wallpaper, so the same crew takes the room from old paper to a primed wall ready for your new design. We work in older homes throughout our service area, including Seattle and Tacoma along with communities in between. For drywall homes, see our separate guide to removing wallpaper without damaging drywall.
Get a free on-site estimate for plaster wall removal
Every older home is different, and the only way to know what is under the paper is to look. Wallpaper Installer Seattle is licensed and insured, with 10+ years of residential and commercial experience. We come to your home, check the layers and the plaster, and give you a free written estimate. Call or text (425) 500-6842, email seattlewallpaper@gmail.com, or request your free estimate online. We reply within 24 hours.
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Frequently asked questions
Is a steamer safe to use on plaster walls?
Generally yes. Sound plaster handles steam well, which is why steamers are a favorite tool for older homes. Keep steam away from loose or cracked areas, protect nearby wood trim, and let the walls dry fully afterward.
How do I know if my walls are plaster or drywall?
Plaster feels harder and colder, and a thumbtack is difficult to push in. Look at the edge of an outlet box with the power off and the cover removed; plaster shows a thick, layered edge, while drywall shows a thin gypsum core between paper faces. Homes built before the mid-20th century usually have plaster.
Can old wallpaper contain lead?
The bigger concern is lead paint on the walls under the paper or painted over it. Homes built before 1978 may have lead paint, so test the painted layers before scraping, steaming, or sanding. If tests are positive, use lead-safe practices or hire a contractor certified for lead-safe work.
Should I leave old wallpaper on to hold cracked plaster together?
Sometimes the paper really is masking weak plaster, but leaving it in place does not fix the problem and makes new paper less reliable. A better route is to remove it carefully, reattach loose plaster, repair cracks, and prime. Your installer can tell you how extensive repairs might be.
Why does the plaster feel chalky after I remove the paper?
A chalky film that wipes off with a damp sponge is often calcimine, a water-soluble paint used in many early-1900s homes. It must be washed off or sealed before priming or hanging new paper. Otherwise new coatings can peel away with it.
How long should plaster dry after wallpaper removal?
Plaster is thick and holds moisture, so allow at least a couple of days, and longer in cool, damp weather. Good airflow and a dehumidifier help. Repairs and primer should only go on once the wall is completely dry.
