In article ,
Crag writes:
Hiya,

I'd be grateful if someone could advise on how to rectify the condensation
problem I have.

I live in a 60s built semi house, with recently professionally installed
cavity wall & loft installation and 10 year old double glazing. I have
always had a really bad problem with condensation in the autumn/winter
months and this year is no different - it literally drips down the windows
(upstairs only mind) and pools on the window sills once the heating has
been on. Surely this shouldn't be the case even if there is a big
difference in temperature between outdoors and indoors?

Looking at neighbouring properties nobody seems to have the same problem
(or at least not to the same extent) as I do.

Once again, grateful for any advice and views.

The windows are probably the coldest surfaces in the house, and
therefore the points where excess moisture is going to condense
out. So the question is why do you have excess moisture in the
air? Possible causes are lack of ventilation, or a source of
excessive moisture. Showers and cloths drying are possible
sources. Might be worth getting a humidity guage (small one for
a greenhouse will only cost a few quid) to see what the humidity
is in the rooms affected (don't measure near the window).

--
Andrew Gabriel