Hanging Pictures on Plaster Walls

Is it plaster or drywall?

Worth thirty seconds, because every decision below depends on the answer and the two look identical once painted.

When adhesive works on plaster

This is the good news and it is widely misunderstood. Adhesive strips are rated for painted surfaces. They do not care what is behind the paint — they bond to the paint film.

So on plaster, adhesive works if and only if:

• The plaster is painted, and the paint is sound. No flaking, no chalking, no powder on your fingers when you rub it.
• The paint has cured. Weeks, not days. Plaster walls are frequently repainted during a renovation and strips applied early pull the film straight off.
• The surface is reasonably flat at the strip position. Old plaster undulates. Pick a flat patch, and check it with the edge of a ruler.
• It is not limewash, distemper or an unsealed heritage finish. These are designed to be permeable and they come away in sheets.

The published weight ratings apply unchanged once the surface passes. Clean with isopropyl alcohol first, never a household spray — but not on fresh paint, which it will lift.

Bare or chalky plaster: the three options

Unpainted plaster is porous and dusty. Adhesive bonds to the dust, the dust lets go of the wall, and the frame comes down. There is no strip or hook that changes this.

1. Seal a patch. A coat of primer over the area where the strip will sit turns porous plaster into a sealed surface. It is the cheapest fix and it is reversible with a touch-up. Let it cure for the full stated time, not overnight.
2. Fit a picture rail. Two fixings into the wall, properly plugged, and then every piece of art after that hangs from cables with no further holes. On a plaster wall where you want several pieces this is unambiguously the right answer — rail versus adhesive.
3. Drill properly, once. If you are allowed to and the piece is permanent, one correctly drilled and plugged fixing does less damage than six failed adhesive attempts. The method is in the next section.

If you do drill plaster, do it this way

Included because getting this wrong is expensive, and because a reader who has to drill should not have to find the method elsewhere.

1. Tape the spot. A cross of masking tape over the mark stops the surface spalling as the bit breaks through.
2. Drill on rotary only, never hammer. Hammer action on plaster cracks it outward. Use a masonry bit at low speed with steady pressure.
3. Drill through the plaster before deciding on the fixing. If the bit suddenly goes free after an inch, you are into a lath cavity and need a cavity anchor. If it keeps biting, it is masonry and takes a plug.
4. Never use a self-drilling drywall anchor in plaster. The threads need material to cut into and plaster crumbles instead of threading. This is the single most common plaster mistake.

For heavy pieces on this kind of wall, the heavy mirror method and hanging without a stud cover the load question in detail.

Pick the lightest version of what you want

On a wall this unforgiving, the best decision is usually made at the shop rather than at the wall. Every pound you do not hang is a pound of risk you do not take.

• Acrylic glazing instead of glass. Roughly two and a half times lighter over the same area, which often moves a frame from needing a drilled fixing to being inside the adhesive rating — the glazing comparison.
• A magnetic poster hanger. No glazing and no backing board, hung from one small hook — the hanger roundup.
• Canvas rather than a framed print. No glazing weight at all, at any size — canvas picks.
• A picture ledge on two fixings. Two holes, and then you can lean and rearrange as much as you like — picture ledges.

And for frames specifically chosen to work with adhesive, the strip-friendly frame roundup screens for flat backs and plastic glazing.