I have recently had a damp problem and have had to have my damp proof course
done using the chemical type of damp proofing where it is injected into the
walls. All looks fine except around the chimmney breast which is an inside
wall and is adjoined to next door. At the base of the wall and about 18
inches up from the floor the wall surface on the new plaster looks soaking
wet still after 5 weeks and has powdery salt like deposit forming there. My
question is this, how long does it take for the wall to dry out fully and
can the plaster still look wet even though it is dried out fully? I am at
the stage where I want to re paper now but I don't want to paper if it is
going to come off again.
By soaking wet, do you mean wet with water or damp proofing injection fluid?
Was the area that is now soaking wet, dry or only slightly damp before damp
proofing was done? The installer usually says don't paint/wallpaper for x
number of weeks. What did they tell you? You can either call them back to
advise, which I think is advisable, or wait until the surface dries out
enough to decorate.
On Wed, 19 Jul 2006 08:01:08 +0100, "Phil Anthropist"
I know it's the worse case scenario, but by any chance does your
fireplace have a back boiler? In older properties these have sometimes
been left in situ.
Obviously, there are water pipes to and from these monstrosities and
an over zealous (unwary) damp proofer can damage them whilst drilling
the injection holes!
It took my chimney breast about 3 months to dry out after
removing the source of damp and leaving it ventilated well
in hot weather, unplastered.
Yes. It shouldn't have been plastered until it dried out.
If the salt deposits keep reappearing when brushed off, then
it's certainly still damp. If you have an electonics test meter,
you can push the probes into the plaster an inch or two apart,
and see if you get a reading on a high resistance setting.
A common source of rising damp in fireplaces is the infill
in the base. It often had no damp course because regular fires
kept it dry, and it will bridge the damp course in the brickwork.
I dug mine out down to the brick damp course (slate), and remade
it with a damp proof membrane, vermaculite base, and thick mortar
top so it could still be used for fires in the future.
Thanks for the input guys,
The damp man told me to wait about 6 weeks before decorating and it is about
that now. The plaster looks as though it has been put on about 4 hours or
so to look at it. It is only about 18 inches up from the wall and in the
one spot as I said. I don't thionk it is the injection fluid because I had
to have 2 rooms done and it's only this one spot where it still looks damp,
the rest looked dry after only a week.
I have wiped all the salt deposits off and drawn a pencil line around the
edge of the damp line and will keep my eye on it for another 2 weeks or so
before I call the guy back. I don't really want to call him back as I did
have a spot of bother with him through dragging his feet and not turning up
Thanks again for your time replying guys.
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