On Sun, 04 Jan 2004 21:25:56 +0000, Peter Parry
wrote:

|You appear to have double glazed windows and no ventilators. The
|first priority should be effective ventilation - without this no
|other solution will be particularly effective.

Sinc my original question a few weeks ago, I have been opening
all the windows in the bedrooms during the day and been running
the heating for an hour or so twice a day. This should be more
than enough to make up for a lack of trickle vents (I was told),
- until I have time to fit some.

|The mould is growing where moist air is condensing, having a cavity
|wall will reduce but not eliminate this. It will occur usually on
|the east side, or on exposed corners, or anywhere else the wall
|temperature can be a touch below everywhere else. Places where air is
|trapped (built in wardrobes, behind wardrobes, behind bed heads,
|anything against a wall) are particularly prone to condensation.

Yep. This is exactly what is happening. Mould behind furniture
and in the corners higher up.
|
|Anything which puts a lot of moisture into the atmosphere will make
|it much worse (showers in rooms where there is no ventilation or it
|doesn't run on for at least an hour after the shower, drying clothes,
|cooking) as will backing off the heating as you go out in the morning
|after all having showered. Closing bedroom doors is another dreadful
|thing - each person looses about a pint of water overnight in the
|form of vapour. Leaving bedrooms closed and unventilated invites
|mould growth.

I've eliminated those issues - I'm sure (see previous reply).
However, the problem is still there after 6 weeks of open windows
and heated bedrooms. I must point out that I have never actually
seen or felt condensation on the walls. But the mould is growing
:-0

|The priority must be on getting rid of the moisture before indulging
|in other solutions. Try a medium sized dehumidifier running all day
|(they are usually too noisy to run all night) near the problem areas
|for a start. Invest in a whole house ventilation system before
|cavity insulation.

OK. But I must say that the wall is _SO_ cold to the touch that I
can't see how moisture can leave it alone! I am convinced that
cavitly-filling is unavoidable, - eventually. However, I know
nothing of the process or costs. Anyone have this info?

H.