I have removed my kitchen cabinets after 30 years and part of just one wall behind the cabinets is like this only upto the the cabinet height. Looking to either plaster bonding/skimming or dot and dab and skimming, not sure what is the best treatment before I do anything. The wall don't seem wet or not smelling of damp this area was next to a sink. Do I need to apply any damp proofing paint or membrane?
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Treating damp before plastering or dot and dab.
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You've got some efflorescence there, so it's likely that you do have a problem with moisture within the wall.
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Is it an external wall? If so, could water be getting in from outside?
it was an outside wall like 60 years ago until an extension and now it's an inside wall. the wall on the other side is fine and this is only behind the floor cabinets I removed and not anywhere else
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Could water from the sink have been leaking down onto the wall? You need to determine whether it was water from the sink causing the efflorescence, or whether there is moisture inside the wall (either coming up from the ground, or down from the roof).
Is it a single solid brick or stone wall?
Perhaps leave 'damp' areas exposed if going to be behind the units anyway. Scrape off the current mess first of course and then plaster down to just below worktop height only.
Sounds like it's most likely leskage from the sink anyway.
Sounds like it's most likely leskage from the sink anyway.
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The green staining could be copper carbonate or copper hydroxide, which would be formed from copper that was dissolved in tap water.
I should have mentioned in my post, that was the colour of the wall painted some 45 years ago.
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