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PostPosted: Fri Apr 06, 2018 2:50 pm 
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Afternoon all,

First time poster so apologies if I miss any of the ground rules (I have checked them)

I've just finished a full renovation of an end terrace property circa 1896. The bathroom needed a lot of work and in the end I decided to have the whole room re-plastered by a professional.

I left the plaster to dry for about 2 weeks and then applied a mist coat which seemed to take fine. Since then, in a very small area on the only interior wall, a few dark areas started to appear when the shower was used (the shower is on the opposite wall but a fair distance away. At least 2.3 meters.). Once the steam/hot air had cooled these patches would fade away.

However, recently they have got worse and in the recent cold weather when the temperatures dropped to -2, these patches bubbled and then sort of morphed into what you see in the attached photos.

Added to this, the other side of the affected wall is the first floor landing, and above that is an area of ceiling that has been water damaged over time and I have rectified by fixing the leak in the roof (why previous owners left it like this I have no idea). So perhaps it's possible some of the water leak penetrated the wall from above? I don't know. Out of ideas!

So, my question is, how do I remedy this? Is it as simple as sanding the patches down, sealing them with a new mist coat and repainting? Or is the issue bigger than this?

Thanks in advance.


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PostPosted: Fri Apr 06, 2018 7:08 pm 
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:welcomeuhm: Yorkie

1. Did the plasterer do a skim coat or were the walls taken back to brick or whatever was there so you had both the thicker undercoat (bonding, hardwall whatever it is called) and the skim coat done?

2. What paint exactly did you use for the mist coat and more importantly for the top coat?

I suspect the plaster was not dry and what you see is its water trying to get out, the plaster is drying in other words. I am only guessing so we need more information to keep on guessing :dunno:

Roger, out.


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PostPosted: Fri Apr 06, 2018 8:17 pm 
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Looks like efflorescence from the pics.

Have a look at this link.

http://www.oldhouseweb.com/how-to-advic ... ster.shtml



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PostPosted: Fri Apr 06, 2018 8:43 pm 
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fitzy wrote:
Looks like efflorescence from the pics.

Have a look at this link.

http://www.oldhouseweb.com/how-to-advic ... ster.shtml

Clever. Tick!!!


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PostPosted: Fri Apr 06, 2018 8:45 pm 
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OchAye wrote:
fitzy wrote:
Looks like efflorescence from the pics.

Have a look at this link.

http://www.oldhouseweb.com/how-to-advic ... ster.shtml

Clever. Tick!!!
Is that Tick or "hic"? [WHITE SMILING FACE]

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PostPosted: Fri Apr 06, 2018 8:48 pm 
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Tick (as in tick the box) not what would make you scratch a lot. Hick approaching ... I am on the warming up stage having finished an email to some bankers.



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PostPosted: Sat Apr 07, 2018 1:02 am 
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If its effloresence then you might have a damp problem becuase the salf crystals come from a reaction in the plaster when it becomes damp..

Scrap as much off as possible and give the bare parts a coat of alkali resisting primer

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PostPosted: Sun Apr 08, 2018 12:02 pm 
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OchAye wrote:
:welcomeuhm: Yorkie

1. Did the plasterer do a skim coat or were the walls taken back to brick or whatever was there so you had both the thicker undercoat (bonding, hardwall whatever it is called) and the skim coat done?

2. What paint exactly did you use for the mist coat and more importantly for the top coat?

I suspect the plaster was not dry and what you see is its water trying to get out, the plaster is drying in other words. I am only guessing so we need more information to keep on guessing :dunno:

Roger, out.


Hi all,

1) the plasterer did a skim coat of the existing plaster

2) mist coat was white Matt emulsion heavily diluted. Top coat was bathroom specific paint from B&Q called Bathroom Soft Sheen which states to be steam and moisture resistant.

1 mist coat and 2 top coats from memory.


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PostPosted: Sun Apr 08, 2018 12:13 pm 
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Skim coat means the plaster should have been dry by the time you painted, so my guess was wrong. Look at the info. provided above about efflorescence :-(


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