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White powder (effluorescence?) on walls (Read 600 times)
thescruff
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Re: White powder (effluorescence?) on walls
Reply #4 - Apr 25th, 2017, 8:47am
 
woodsmith wrote on Apr 24th, 2017, 10:28pm:
However it may just be salts in the brickwork,or mortar, that have been activated by the wet plaster and once you clear them off they won't reappear.


That's what it sounds like to me, you can tell if the plaster is dry/drying as it changes colour (lighter)
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woodsmith
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Re: White powder (effluorescence?) on walls
Reply #3 - Apr 24th, 2017, 10:28pm
 
Sounds like you do need to check your pointing and look for any signs of water getting onto the brickwork from faulty guttering for instance. However it may just be salts in the brickwork,or mortar, that have been activated by the wet plaster and once you clear them off they won't reappear.
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Re: White powder (effluorescence?) on walls
Reply #2 - Apr 24th, 2017, 12:31am
 
1920s/30s. Double brick, no cavity wall.
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woodsmith
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Re: White powder (effluorescence?) on walls
Reply #1 - Apr 23rd, 2017, 8:04am
 
How old is the house, and do you know how the walls are constructed?
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Zac
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White powder (effluorescence?) on walls
Apr 22nd, 2017, 7:37pm
 
About 5 weeks ago I had my kitchen reskimmed but I haven't redecorated yet. Near the kitchen sink, behind the washing machine, a couple of patches of powdery white deposits (effluorescence?) have appeared, also a patch near the kitchen door (both patches on outside walls). I'm now wondering if I need to repoint the brickwork outside to stop dampness. There are also effluorescence remover products on the market but I feel that they would not really solve the problem. Any advice welcome.
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