This was a year before we moved in... I dont think its possible to flood where we are as we are on top of a hill and the nearest water is at the bottom.

Good call though. Im thinking there must be moisture somewhere in the house, maybe the loft. It has to be something other than just moisture from showers etc as im the only house on the street that suffers.

Cheers all

just to note... i think even though your house is rendered there should be some kind of air bricks

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- Dave
http://www.pamperhouse.net
http://www.invertedcircle.co.uk

OK, so flooding is out.

Another question.....if you're away from the property on holiday, for example, do you come back to the streaming windows and general dampness?

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http://www.isistherapytraining.com/

Not sure if you saw my last post - but have you tried leaving the dehumidifier on ALL the time? Turning it on and off isn't going to be terrible useful.....does it have a dial to set the humidity level and is it the right size for your house?

Perhaps a quick way to check it IS just humidity in the air is to put it into a room and shut doors, etc and leave it on 24 hours - then go into the room and see if it's as bad as the rest.

BG

Here are a couple of other things that I've come across.
(I used to work for a window systems company and going out to installations with condensation problems was one of my jobs)

Portable gas heaters - every gallon of fuel burnt produces a gallon of water vapour.

Fish Tanks - whatever you need to top up each week will end up in the air.

Lots of plants that need watering - same as above

Humidifiers for those with an ashma condition.
Apparently you need a fairly high humidity for comfort (about 75%)

The problems I came aross were all down to the occupiers lifestyle; i.e. drying washing, leaving bathroom doors open etc.
Installing new double glazing often created a problem as it replaced draughty windows that provided good ventilation.

Maybe buy a humidity sensor, they go from as little £15, or a recorder for £100. I used to install these and leave for a week to see what was going on. A £100 is a bit much though.

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If you ask enough people, one will have the answer!

Nope. The heating is turned down and as we aren't in the property there isn't any condensation at all.

Cheers

I did. Thanks. That's what I'm doing at the mo. It's helping... not solved yet but a good move in the right direction