Two years ago I had a conservatory built against the brick side wall of my
house.
The brick wall was then dry-lined and skim plastered, except for an area of
about one sq foot, which was plastered & skimmed to a depth of about 3/4 of
an inch.
After two months I painted the wall with a diluted coat of emulsion and then
a full coat of silk emulsion.
After about a year, the emulsion began to bubble badly in the area of the sq
foot of solid plaster, so I scraped and sanded the emulsion off this patch
and then primed it with a 1/5 diluted pva and then a full coat of silk
emulsion.
Now, almost a year later the emulsion on the same area is badly bubbled
again.
There is definitely no dampness present.
I've asked for advice at my local B&Q and local paint shops but without
success.
Is there a solution to this problem?
Any advice appreciated.
tia

Mackem wrote:

There is definitely no dampness present.

Odd, that is what it sounds like....

I've asked for advice at my local B&Q and local paint shops but without
success.
Is there a solution to this problem?

Hack off the plaster and dryline that bit to match the rest?

--
Cheers,

John.

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John Rumm wrote:
Mackem wrote:

There is definitely no dampness present.

Odd, that is what it sounds like....

Efflorescence is caused by water in the plaster. Why was this patch not
treated in the same manner when the rest of the thing was
plasterboarded? And how much water is being voided through the
brickwork on the other side of the wall?

It sounds like that patch abuts a room that is usually steaming. A
boiler, laundry, airing cupboard or some such?

Maybe the rest of the walls are getting the same problem but the gap
between the wall and the plasterboard is providing enough protection to
stop it being seen. Any woodlice or silverfish present there?