***EMERGENCY plastering help!***

Discussion
1

Kitchen has been replastered. Plan was to leave the plaster finish, just sealing it. On a really tight schedule…But…

Something has leeched out!?

Any ideas what’s gone wrong?

Have they overlooked something in preparing the wall before plaster went up? they just took the old tiles and wallpaper off.

That sloping roof if the part of a chimney breast, they said you could see daylight from there, they’ve sealed it so it does’nt let rain down anymore. But should they have waited for the wall to fully dry? Testing it with a meter? Or sealed it to be sure?

Whats the solution? Will it come through a coat of emulsion paint?

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2

That’s weird… how long between being plastered and this?

3

Plastered Friday morning. No one on site during the weekend. Notified this morning of the stains.

4

Looks like rust stains. Might there be structural metalwork behind the plaster?

5

Its a solid brick house construction, 1930s. Dont think there’s any steel.

It is very strange. Looks like plaster has sucked out minerals or something from the bricks??

6

Is exactly what I was thinking, I have seen it in old bathrooms… if that is the case it will show after painting
On very small patches I solved the problem with one or 2 coats of oil based paint (satin wood) but I don’t see it suitable for so large areas…

7

What do you think it is @stefanoromano?

I thought about tiling but a friend said it would come through the grout.

He suggested dib and dab silver backed plasterboard.

I thought about painting as well, like you was worried it would come through the paint.

Should I leave it for couple of months to see if the bricks underneath dry out?..and then paint or tile?

@lewisss what would you do?

8

Do you have pictures of before the plaster went on?

9

I would do a mist coat first then stainblock preferably a spray on one

10

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11

Here’s whats behind…new timber has been put up, the right dark cavity leads up to the chimney, and where water was getting in.

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12

Yep it’s coal/soot stains coming through
Treat as above
At least 2 coats of stainblock

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13

Thanks mark. Worth waiting a couple of weeks for it to dry out?

14

As long as the plaster is dry it should be ok ,
Make sure you go at least 300mm either side with the stain block.

The only issue would be if your chimney is not capped as water will constantly be pushing the stain through

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15

Absolutely what Mark says — and you must make sure the source of water is stopped. Although the stain coming through now isn’t necessarily a sign that there’s still water ingress.

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