internal damp patch

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windy

windy

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Hi all how would you treat this area. Looks like rising damp but area is 1m away from any external walls and has a kind of evvervessence on the surface (salt??) Area does not feel wet to touch.


They have used damp proof paint and this was the effect atfter 6months.

External walls are fine, no penetrating damp and DPC is installed.

Was gonna hack off old plaster upto 1m

use s & c backing coat and reskim?

How would you treat this? Its for the ma in law and she is only paying for mats before you start accusing me of goin into customers houses to "practise"
 

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Out if interest windy , was there something in front of those patches that could have caused it as i cant see any water marks , just thinking out loud , maybe give the surface a good scrape 1st and see whats behind , it doesnt look like typical rising damp ? , im not keen on damp proof paint either , especially in a area where condensation may occur
 
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When i say 1m away from external wall i mean this effected wall and opposite side are inside the property :huh:
 
prolly rendered to the tiled floor.. be picking it up when the old dear mops it...
or condensation if theres owt backed up to the wall like a fridge freezer
 
By the dark marks on the wall it looks as if there was something tight up to the wall here, so a lack of air flow has contributed to this:RpS_thumbup:

And as for damp-proof paint............LOL
 
Well it looks damp to me the skim is blown and I see a small skirting board which is more a seventies when used. If me the hammer and bolster would be out and chop them two patches back to brick . take skirting board off and check to see just how far the render is to the floor. You can also inject it with damp cream yourself get some salt treatment spray or ask chris w how to make it and re render with a proper backing plaster for this kind of problem. BQ sell it or they do in my local store.
 
id have the skirt off first...
then see...
hack off and dricoat if it needs it...
salt neutraliser is acetic acid, water and a surfactant... go figure... :RpS_wink:
 
what I am on about is antisulphate liquid but at £39 + vat when he only needs a t**t full to spray this small patch in this affected wall.
 
39 quid plus vat for acetic acid, water and a surfactant...
otherwise known as 50/50 vinegar and a drop of washing up liquid...
try it...
especially on cat p'ss and round the bog...

use white vinegar on garden walls...
 
The solution is home made antisulphate which stops the passage of hygroscopic salts from the brickwork into your render and skim. Fecking the walls up like in the picture.
 
OK im a right here

remove skirt
Hack off old plaster
Apply dricoat
Skim

at what stage do i use the antisulphate liquid?
 
windy said:
Sorry im confused by the debate?

Whats the soloution?
Click to expand...
if it was that easy mate, even d*m**o could do damp work...

its a picture of flaky paint on a damp wall windy...

its either condensation, penetrating damp, bridging or a failed dpc just there, no where else in the house...

solution?

how bad is it? what exactly IS the cause? symptoms can be similar whatever the cause, diagnosis is the key, and then you have your answer...

in your case, education, then diagnosis, then its easy...

i always tell myself on these jobs 'Ive done the work diagnosing the root cause of the problem, so i havent got a problem chargin double for the work' make sense?
 
if it makes it any easier, ive just last week patched up about a metre of plaster...
customer thought that water was getting behind the tiles, travelling 1500mm downwards and manifesting itself as 'damp' on the other side of the wall...

I pulled the bath panel off, ran the taps and held my hand under the trap...

p'ssing out...

165 quid, new trap, waste, and a patch up...
 
Alright mate lets go through it again. This problem has not happend over night do you know how long. What is on the other side of the wall has the skim blown there is it 4" or 9" is the skirting fitted over the tiles are the tiles above the dpc . This problem may just be a small part of the dpc faild like 1 brick causing the problem. What is the room used for is there a bathroom near by is there a outside tap fitted to the other side of the wall.
 
henry said:
Alright mate lets go through it again. This problem has not happend over night do you know how long. What is on the other side of the wall has the skim blown there is it 4" or 9" is the skirting fitted over the tiles are the tiles above the dpc . This problem may just be a small part of the dpc faild like 1 brick causing the problem. What is the room used for is there a bathroom near by is there a outside tap fitted to the other side of the wall.
Click to expand...
possible henry but the likelihood? flynny would automatically kb the idea, id leave it till last...
customer culprit is 99% likely...
 
reason its a riddle to you is the same reason its a riddle to the customer...
big subject is damp... lot to understand.... more to do with physics and archimedes than plastering mucka...
sorry maybe not archimedes... thats rich's new boat... :RpS_laugh:
 
physics mate... and sherlock holmes...
eliminate whatever cannot be the culprit, and whatever is left, however improbable, must be the reason...
 
windy.......I've asked ya a couple of questions and you aint answered them.........trying to help you here
 
like trying to teach particle physics to d*m**o mate... damp needs to be taught ground up bubbles.... you know that...
on a forum its either 'just do it' or 'go google it' with damp...
no disrespect to op, you just aint got the basics mate... we could be here for f'ckin weeks...
 
Great that actually now makes sense. Why is it that that the sopts of damp are at knee level when the heat which i assume from cooking etc rises?

Now also if she gets some form of ventillation. how do we treat the damp patch. Just scrape it and re paint?
 
Condensation in a kitchen is gonna be everywhere, but what forms at the top of a wall will run to the bottom yes?
As for the solution - you might be offered a few suggestions ranging from dry it off/scrape down & skim, right through to hack it all off/injection etc...
Are they willing to pay for an extra rad on the CH system? Plus extraction unit? These need addressing first or you're wasting your time mate:RpS_thumbup:
 
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