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PostPosted: Sun Jan 14, 2007 9:23 pm 
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Sorry if I am starting a post that exists. I have looked but couldn't find anything on the matter.

Anyway I have efflorescence on the plaster in one of my upstairs bedrooms. This wall is an external wall, the problem is coming from the celing down.

Does anybody know of any way I can cure this problem. I have looked on the net but can't find anything.

thanks in advance

Peter

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PostPosted: Sun Jan 14, 2007 10:26 pm 
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Hi Peter,

Is the wall painted or papered?

Has it recently been plastered ?

Is the wall damp?

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PostPosted: Sun Jan 14, 2007 10:35 pm 
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My thoughts were, "is it damp" too?........if so, the first thing to do is get the roof checked for leaks!!!

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PostPosted: Sun Jan 14, 2007 10:39 pm 
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I was thinking the same, or perhaps the gutter!

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PostPosted: Sun Jan 14, 2007 10:53 pm 
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Hi there, sorry, just got back to pc.

I plastered the wall around 3 years ago. It is currently painted. The problem has been there for a couple of years. I had the flashing around the chimney replaced around a year ago and that seemed to solve the problem.

Recently had the roof done and the problem has come back. The area is below where the chimney is.

I have contacted the builder and he said that he can't see a problem, however he is coming back this week to have a look on the roof at the flashing.

Up in the atic there is an area of damp which I gather is seeping down to cause the problem.

At current though the paint is blistered and I want to also resolve that.

Any suggestions will be great.

thanks

Pete

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PostPosted: Sun Jan 14, 2007 10:55 pm 
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The builder suggested taking the paint off where it has blisted and using a paint/PVA/water mix to seal the area's. Then paint over this when it has dried. Will this suggestions just move the problem to another area surrounding the current area.

Is it a case that I need to get the whole wall replastered or can I just do what the builder suggested.

cheers

Pete

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PostPosted: Sun Jan 14, 2007 11:20 pm 
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PVA will not cure an old damp problem because it's water based and the staining will reappear!!

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PostPosted: Sun Jan 14, 2007 11:34 pm 
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That is not an ideal solution!

PVA turns back to water once it is damp, unless you use special external PVA.

Has the plaster blown?

If you knock it with your knuckles does it sound hollow? If yes then it needs removing and re-plastering once the problem has been fixed!

If it has not blown and is still firmly attached then get the flashing fixed first then give it a few weeks to dry out properly and then scrape off the efflorescence and then seal the area with stain block, leave this to dry and then paint or paper on top.

http://www.screwfix.com/app/sfd/cat/pro ... 4&id=33676

The problem with the roof or flashing needs fixing first though :wink:

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PostPosted: Mon Jan 15, 2007 6:03 pm 
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Hi there, the plaster hasn't blown so no probs there. Will scrape the paint off and let the plaster expose for a while so that it can dry out a bit quicker. Hopefully the builder will sort the flashing this week.

Have some stain block in the shed so will use that when it's dried out.

thanks for your help and advise on this. Bet all the rain that we have had recently hasn't helped either.

Will get to it this week.

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