Can anyone advise please? Live in a victorian semi-detached property
built approx 1890. Have a problem with condensation on the internal
party wall, the walls are of solid construction i.e. non cavity.
Had a damp survey undertaken which resulted in drilling the wall and
analysing the contents. The surveyor informed that the brick was dry
and the problem was due to condensation. The wall has been previously
skimmed with a DPC injection.
The problem is getting worse with damp patches on the skimmed plaster,
it gets worse when it is raining. The plaster is cracked and has
started to flake and crumble leaving a white powder on the grey
concrete underneath which look like deposits of salts. A chrome
electrical socket has also started eroding and crumbling away.
Unsure of what to do next? Should I remove all the plaster/ material
off the wall and place in a drywall system?
Hope someone can help.
Its unusual to get condensation on a party wall, as the heat from next
door should keep it warmer than the external walls. You say that it
gets worse when raining, but the party wall is an internal wall -
unless you have a roof leak or moisture coming down a chimney.
Your 'surveyor' should also have given you practical advice on treating
Without knowing all the room details, the easiest thing to do may be to
fit plasterboard (or thermalboard) on battens to the wall to raise the
surface temperature and stop condensation forming. But that may just
move the condensation to another surface
However, the condensation should be tackled at source, and you should
consider what you are doing to produce the moisture in the air
(cooking, bathing, drying washing etc) and what you are doing to
extract it (opening ing windows, using fans etc)
Was it skimmed at the time the dpc was done? If so it may be waterproof
plaster, which slows evaporatoin thus makes it wetter, although it
takes some time to get wetter.
You dont really give enough information. Is there a chimney there? If
so possibly lack of ventilatoin or salt contamination. Leakage from
roof is also a possibility. However probably the number 1 suspect would
be too high interior RH, which is corrected by looking at what else has
been done with hte property to modify its damp handling abilities, and
by reducing damp input at sources. Really theres just not enough info
in your post to pin it down any fuirther.
On 6 Sep 2006 15:20:11 -0700, email@example.com wrote:
Agree, properties with solid walls have cold walls(*). The normal cause
of interior condensation is lack of ventilation, normally caused by the
installation of double glazing.
No drying of clothes over radiators or on drying racks or if you do make
sure there is ventilation (open a window a bit). Bath rooms and kitchens
to have extractors that are used. The difference changing our cooker hood
from recirculate to "dump outside" made to the downstairs humidity was
very noticeable. Must fit an extract to the bathroom sometime, upstairs
suffers from condensation.
(*)Great in the summer, keeps the place cool. Great in the winter, keeps
it warm but what ever you do don't let it cool down as it'll take days to
warm back up.
Dave. pam is missing e-mail
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