So yesterday I was trying to put up a frame using 3M command strips and they kept on coming off because only half the strip was actually touching the wall. Then I realised the whole wall was actually curved, the deepest part of the curve being around 1cm in.

I've been looking at videos at existing threads but everything seems to be for drywall something or other. I live in an apartment, so the wall is solid brick + plaster. What would be the best way to go about straightening the wall?

  • 1
    Do you really mean "straightening the wall"? Or do you mean something like "effectively hanging flat object on a curved wall"? How big & how heavy is the frame? Dec 15, 2019 at 4:57
  • Hello, and welcome to Home Improvement. Across what distance are we talking about "straightening" 1cm? Is there a reason why you can't add to the frame to make it conform to the wall? And, you should probably take our tour so you'll know how best to participate here. Dec 15, 2019 at 11:27

1 Answer 1


If your objective is to provide enough of a flat surface for an adhesive strip to hang something, I'd try taking a 120 grit sand paper, scuffing the small region where the plaster is and applying a little spackle with a small putty knife, probably nothing over 3", just wide enough to cover the area where the strip covers. There's a fine art to applying mud or paste and leveling it, so if you're not experienced, you can practice a bit. Spackle comes in small containers and has glue in it, and that should do a pretty good job of adhering to the plaster. If the curvature is minor, you shouldn't have to worry much about shrinkage. You can take a hairdryer on a low setting to expedite the process. Once it's hardened, voila, you should have a level surface with some texture that the entire adhesive strip will bind too. If the plaster has been painted a color other than white, it will be unsightly, but if the goal is to suspend a frame, the frame should conceal it. When you move out, it wouldn't be anything to take some 15-minute dry mud and conceal and sand the whole thing down and match the paint, so you're not really damaging the wall in any manner. The only other choice that comes to mind is using a concrete screw like a tapcon or something more extreme like an expansion-type anchor bolt, and both techniques involve using a masonry bit and boring into the brick.

  • Thanks for the info. The wall is actually flat enough for the strips - it's just that the entire thing is curved, and the frame/poster I'm trying to hang is really big(27"x40"). So what's happening is that when I put the frame on the wall the bottom pair of 3M command strips stick fully onto the wall but the pair on top only half touch the wall because they're not on the same plane as the bottom pair
    – Mark C
    Dec 20, 2019 at 11:57
  • @MarkC I see, then just hang a strip, like a 1X2 or 2x2 across the top to allow it to hang vertically. Is the curvature MORE than 2" from plumb?
    – J D
    Dec 20, 2019 at 13:29

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