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I do not know what this wall is made of, it’s a living room wall and the on the other side of the wall is the outside. I knocked on it and it sounded hollow so I tried a Zenith Sure Hook Picture Hanger (pic of the product attached) which as you can see did not work. Is anyone able to tell what picture hook product I should use? Adhesive strips are not an option, I need the hook to be secure.
Hello @TTD
It appears to be some form of hardboard under the plaster surface. I propose trying a standard screw to see if the wall actually holds onto the screw. If it appears that it has no holding strength. I suggest using Tox M6 Flip Toggle Bolt or Ramset 6 x 38mm Universal Anchor - 6 Pack.
Here is a handy step-by-step guide: How to hang just about anything by @Adam_W.
If you have any other questions we can help with, please let us know.
Eric
