Apologies if this is a very stupid question, but how do you know if plaster sounds hollow when tapped? I have very old plaster with cracks and when I tap in different places I can hear subtle differences in the sound but I can't tell what sounds hollow.
question about hollow plaster
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That should be fairly obvious, by the hollow sound, compared to the dull sound of good sound plaster - like a drum. It will also feel a little different, because hollow plaster will move a little.
@Harry Bloomfield thanks I think I have worked it out. I think it's because there are quite large areas that are sounding hollow that it was difficult to hear any difference. I can obviously fill the crack but is there any way of sticking back plaster once it's come loose or should I just not touch it and wait for it to fall off?
I think I heard of ways to refix it, but obviously the best way is to remove and replaster. I think I remember injecting PVA behind loose plaster as one way, but you would need a method to push the loose plaster to the wall. Another way would be to drill into the wall and pull it back with a screw/plug.
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One of the best ways to hear loose plaster, tiles, even wallpaper, etc, is, to run the back of your hands/finger nails across the wall, far more effective than tapping/knocking on the walls.
Interesting I have never heard of that before. Just tried it and you can really hear the difference in sound. Thanks.
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No probs,, it works every time as well, whether on solid walls or plasterboard walls etc.
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