When to apply damp proof paint?

[cherryblossom123]

Hi,

I had a problem with old soot causing some damp on a wall.

It was hacked back to brick work and treated with some product and plastered with limelite plaster.

It's had several weeks to dry now and I'm ready to think about painting it.

My plasterer suggested a layer of damp proof paint on that wall would be a good idea.

Just wondering what is the correct order to do it.

Shall I mist coat, then damp proof (one coat), and the two coats of my colour paint on top?

Or should the damp proof paint go directly on the new plaster? What would you suggest?

Thanks

 

[Wayners]

You should not put anything on limelite or lime plaster that seals it. This will only trap moisture causing issues

 

[foxhole]

Soot causes no damp , unventilated , damaged chimney would be the obvious culprit , has the damp issue been fixed ? Has the chimney been swept.Otherwise you would be wasting your time redecorating .

 

[cherryblossom123]

Soot causes no damp , unventilated , damaged chimney would be the obvious culprit , has the damp issue been fixed ? Has the chimney been swept.Otherwise you would be wasting your time redecorating .

The chimney was removed previously I'm guessing old soot has caused the damp issue it was stripped back to brickwork and then treated (not swept but some kind of product was used to prevent the damp penetrating) then finished with a breathable plaster.

I'm just going to mist coat and decorate as normal and hope the product that was used does as advertised and prevents the damp penetratong through it and coming through the plaster.

 

[foxhole]

The chimney was removed previously I'm guessing old soot has caused the damp issue it was stripped back to brickwork and then treated (not swept but some kind of product was used to prevent the damp penetrating) then finished with a breathable plaster.

I'm just going to mist coat and decorate as normal and hope the product that was used does as advertised and prevents the damp penetratong through it and coming through the plaster.

Nothing prevents damp penetration , where is the source?

 

[cherryblossom123]

Nothing prevents damp penetration , where is the source?

I was told it was likely caused by Hygroscopic salts

 

[foxhole]

I was told it was likely caused by Hygroscopic salts

They are evidence of heavy damp problems , they don’t cause anything .

 

[cherryblossom123]

They are evidence of heavy damp problems , they don’t cause anything .

Well not sure what I should do then. This is what I've been told by members of this forum and other builders so then I'm lost. I'm not an expert and don't have any experience dealing with building or anything like that, I work with computers for a living, so what do I do? I try and speak to people that should know in real life and on here, but everyone gives conflicting information and it is rife with cowboys and con artists. Tell me where is an honest, reliable, and knowledgeable trade? I didn't meet one yet in my life. Most are lazy and unreliable just wanting the money and will say anything to get it. Why not hold themselves to a higher standard .

I'm already thousands of pounds in, maybe you're suggesting I come and have someone rip up the plaster and floorboards to dry and solve this mystery damp problem... maybe the next suggestion will be to check the gutters, but oh wait it is a party wall. Then someone else is going to come along and tell me I need to go and do something completely different and then someone else will say the same, ad infinitum. I'm just going to mist coat, and hope for the best.

 

[foxhole]

You can get damp quite easily in a party wall especially in terraced properties ? Nothing in your post giving any information about the type of property you have .
Unless damp problem is addressed any other work is pointless .

 

[cherryblossom123]

You can get damp quite easily in a party wall especially in terraced properties ? Nothing in your post giving any information about the type of property you have .
Unless damp problem is addressed any other work is pointless .

It is semi detached. I've already had it plastered and I'm going to decorate it. There is no other route forward as I've said I've had several "experts" and people on here weigh in and no one has given an adequate solution. Hope the damp proof membrane used by the plasterer can stop it showing through if not i will buy some breathable shellac primer and go over the problem area with that and repaint. Don't have time, money, or energy to deal with whatever clown comes to look next, because the truth is, is that most of these experts don't have a clue - or at least anecdotally that has proven to be true.

You can review my first post where I asked about it and was told it was due to the old chimney soot drawing in moisture. There is no other route forward as I see it.