How do I remove polystyrene ceiling tiles?
Getting the tiles off, then the much harder problem of the adhesive blobs left behind — and the point where the right answer is to board over the lot instead.
- Difficulty
- intermediate
- Time
- 4 hr
- Read
- 4 min
- Safety
- warning
Short answer
The tiles come off easily with a scraper. The adhesive does not. Expect to spend most of the job on the residue, and consider overboarding the ceiling instead, which takes about the same time, avoids disturbing whatever is underneath, and gives a flat surface at the end.
Expanded polystyrene ceiling tiles were fitted in enormous numbers from the 1960s to the 1980s, usually to cover a poor ceiling. They are a recognised fire risk — they melt and spread flame rapidly and produce thick toxic smoke — so removing them is worth doing. What people underestimate completely is the adhesive: dozens of hard blobs per tile, bonded to whatever surface is underneath.
Safety
What you'll need
- Wide stiff scraper
- P3 mask and goggles
- Working platform or steps
- Rubble sacks or bin bags
- Dust sheets
- A heat gun or an adhesive remover (optional)
- Filler and jointing compound (optional)
Step by step
- Establish what is under the tiles before you commit.Lift one tile in a corner and look. If you find a textured coating and the property predates 2000, stop and have it tested. If you find sound plaster, the job is straightforward. If you find lath and plaster in poor condition, boarding over may be the better plan.
- Clear and sheet the room.Polystyrene fragments are static, get everywhere and are miserable to sweep up. Sheet the floor and everything in the room, and keep a bag with you as you work.
- Isolate the lighting circuit and drop the fittings.Tiles are always cut around light fittings, so removal means working right at them.
- Scrape the tiles off with a wide stiff scraper.They come away in pieces. Work systematically across the ceiling rather than picking at the loose ones, and bag as you go.
- Assess the adhesive residue honestly.This is the real job. You will be left with a ceiling covered in hard blobs of old adhesive, and every one has to come off or be made flush before the ceiling can be finished.
- Take the residue off mechanically where the substrate allows.A sharp scraper held flat, working across the blob rather than digging at it. On sound modern plaster this works. On soft old plaster you will take the surface off with it, which is a decision in itself.
- Use heat or a solvent remover on stubborn adhesive.A heat gun softens many old adhesives so they scrape off. Proprietary adhesive removers also work but are slow, smelly and need ventilation. Test both in a corner — some adhesives respond to neither.
- Do not sand the residue if you have any doubt about the substrate.Sanding is exactly what turns an unknown coating underneath into an airborne problem. If the ceiling under the adhesive is textured and untested, stop.
- Decide between making good and boarding over.A ceiling with a hundred adhesive scars needs skimming or a very thorough filling job. At that point, overboarding is often quicker, cleaner and better — and it is the obvious answer if there is a textured coating underneath.
- Finish the ceiling.Skim, or fill and sand and prime with a sealer, then paint. Old adhesive can bleed through emulsion, so a stain-blocking primer is worth using over any residue that would not come off.
Common mistakes
- Scraping straight into what is underneath — If the tiles were stuck over a textured coating in a pre-2000 property, aggressive scraping releases whatever that coating contains.
- Underestimating the adhesive — People allow an afternoon for the tiles and discover the residue is three times the work. Look under one tile before you plan the weekend.
- Painting over remaining residue — Old adhesive bleeds through emulsion as brown or yellow patches, sometimes weeks later. Seal it or remove it.
- Burning the tiles — Polystyrene produces dense toxic smoke. It goes in the bin or to the household waste centre, not on a fire.
Alternatives
- Overboard the ceiling: Nine and a half millimetre plasterboard screwed through into the joists, over the tiles or over the residue. Removes the adhesive problem entirely, encapsulates anything underneath, and gives a flat finish. Usually the better answer once you have seen the residue.
- Skim over after removal: A plasterer bonds and skims the scarred ceiling. Gives a proper finish without the depth of boarding, and requires the substrate to be sound and the residue to be knocked back first.
- Leave them and do nothing: Not recommended. Polystyrene tiles are a genuine fire risk, particularly on an escape route such as a hallway or stairwell.
- Get a specialist in: Where the ceiling beneath is a textured coating that tests positive, the tiles, the adhesive and the coating are all one job for a contractor working to the right controls.
Questions people ask
Are polystyrene ceiling tiles dangerous?
They do not contain asbestos, but they are a significant fire risk: they ignite readily, spread flame across a ceiling and produce thick toxic smoke. On a hallway, landing or stairwell — the route you would escape by — that is a real concern and a good reason to remove them.
Could there be asbestos in the tiles or the glue?
The tiles themselves are polystyrene. Some old adhesives and, much more importantly, the textured coatings frequently found underneath them can contain asbestos. The risk is in what is under them, not in the tiles.
Is there a shortcut for the adhesive?
Not really. Heat and patience, a chemical remover, or covering the whole thing with plasterboard. Anyone promising a quick solvent answer has not met a 1970s ceiling adhesive.