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PostPosted: Mon Oct 30, 2017 12:18 pm 
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You could use this


http://www.zinsseruk.com/product/watertite/


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PostPosted: Mon Oct 30, 2017 4:36 pm 
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Now that looks interesting. The data sheet looks like it would work, coverage is tiny though.

I will do some more research. Thanks.


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PostPosted: Mon Oct 30, 2017 4:55 pm 
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My tuppence worth is wait until it's fully dry, mist coat with non vinyl leave it a few weeks and see if the damp comes back.

If it doesn't all well and good and topcoat. If it does then the zinsser watertite may be the way to go, buuuttt always better to find and remedy the source of the damp ...

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PostPosted: Mon Oct 30, 2017 5:30 pm 
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Definitely needs to dry out first, that was a last resort really.


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PostPosted: Mon Oct 30, 2017 5:59 pm 
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Definitely going to give it some time to dry out.

I am not sure where the water could be coming from, if it was from above wouldn't it be at the top of the wall? The other side of the wall is another room and the walls on that side are fine.


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PostPosted: Mon Oct 30, 2017 6:50 pm 
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NM20 wrote:
if it was from above wouldn't it be at the top of the wall? The other side of the wall is another room and the walls on that side are fine.


Not necessarily, say a small weep on some plumbing will run down the inside of the wall until it hits a hard surface... I hope that isn't the issue.

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PostPosted: Mon Oct 30, 2017 7:03 pm 
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And the corner bit from the ground up :-(


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PostPosted: Mon Oct 30, 2017 11:30 pm 
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fans an driers or weird concoctions wont help. that wall might be filled with loose rubble sucking up the damp
any paint or whatever you use on thatwall will be blown off.the damp will keep getting throgh. you will have to remove the skirting and knock off the gypsum plaster an break contact with the conc floor. keep the new render up 40mm from the conc floor.use sand an lime render ,never gypsum,an skim with board finish or limelite finish.you might have to do this on bothsides of the wall.

lime render wont solve the problem but it will give you a few years ddamp free..

this post should be in the remedial/damp forum, its not a decoratin problem but a damp issu



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PostPosted: Tue Oct 31, 2017 8:02 am 
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Thanks for the input. Fair point about the forum, I am happy for it to be moved if the mods can do that.

Wouldn't the whole wall be effected and not just that one point if it was rising damp? It hasn't got any bigger (or smaller) over the past few days.

If the paints don't work, my next course of action will be to tank the wall.


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PostPosted: Tue Oct 31, 2017 9:00 am 
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I'd play the waiting game and see if it dries out. In the meantime put a pencil mark along the edge of the damp mark, then you will see if it increases or decreases. If it's still there after a couple weeks I would use Glutenglass on these areas, it will hold back water stains coming through the paint/paper for certain, and it's only a small area after all. We had a similar problem on a job and we used Glutenglass , eight years later and still no sign of the stains coming through, and this internal wall was below ground level.



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PostPosted: Tue Oct 31, 2017 2:00 pm 
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NM20 wrote:
Thanks for the input. Fair point about the forum, I am happy for it to be moved if the mods can do that.

Wouldn't the whole wall be effected and not just that one point if it was rising damp? It hasn't got any bigger (or smaller) over the past few days.

If the paints don't work, my next course of action will be to tank the wall.


I think you said you have already plastered the wall twice. Slow down for a moment and do not just yet decide on the next course of action. I don't have much of a clue about rising damp but if you want to move the thread click on the bottom right of your original post (red exclamation mark) and ask the moderators. The whole wall would not be affected, because as the dampness rises it starts evaporating through the surface of the wall and that is how far it gets. If you were for example to tank the bottom 1 metre of the wall then it is likely the dampness would rise above that 1 metre. If you were to tank the whole wall, then nothing stops it trying to come out the other side of the wall ... if it finds enough material to carry the water. Gypsum based plaster likes water so it actually sucks it in.

A few years ago it took me 1 month to dry out my bathroom which had undercoat + skim coat plaster done (ziltch heating though but a fan heater on and off). Whilst it is drying you will see a gradual change in the colour (don't check twice a day). If it stops drying out you will know.

What is worth figuring out is whether there is something you can do at skirting board level to try and stop any rising damp (if that is the problem) instead of considering how to hide the problem. If there is no easy/affordable solution then you can go back to "hiding" the problem.



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PostPosted: Tue Oct 31, 2017 2:11 pm 
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Moved in here at OP's request.



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