New windows and condensation

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If you sleep with your bedroom door closed in the winter and have no window open you will have condensation most mornings.
 
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OK so taking on-board the advice about not breathing while in bed! :) We decided to swap bedrooms last night……. Woke this morning but our bedroom window was still covered in condensation! The room we slept in was ok (and I assure you we did breathe).

I should add, we are not aware of any heavy breathing mice or spiders in our bedroom. The loft is well insulated and the room is generally warm enough. The lowest over night temperature over the last couple of nights being 17 degrees.
 

JohnD

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did your air the room, and especially the bedclothes, since you previously used it?

feel the floor round the radiator, and look for signs of damp round the windowframe, looking for a source of water. have a look in the loft for pipes, tanks and roof leaks.

water vapour is lighter than air, so will rise through a house, for example if the room below is humid, as it may be from ironing.

does the spare room have better ventilation in some way?
 
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We actually ran our dehumidifier for about five hours before vacating the room. There is absolutely no signs of damp anywhere. The room is above the living room. Our roof had to be replaced last August ( in hot sunny weather), hence the plenty of insulation.

The only down side to this house is that it is solid wall (no cracks, missing pointing or missing brick facing) and after the roof and windows, I can’t afford external cladding. However, if that is a problem why is it only the front, south facing room that is affected?
 
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Don't suppose youve been decorating that room have you?

Failing that get a ' damp meter ' and just check the whole room ( floors and ceilings too ). It does seem odd its only one room . youve ruled out your presence in the room, which is a start , now you need to completely rule out any damp. As its south facing ( and probably gets all the weather ) I wonder if rain is being blown in somehow
 
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Don't suppose youve been decorating that room have you?

Failing that get a ' damp meter ' and just check the whole room ( floors and ceilings too ). It does seem odd its only one room . youve ruled out your presence in the room, which is a start , now you need to completely rule out any damp. As its south facing ( and probably gets all the weather ) I wonder if rain is being blown in somehow

I omitted to say that I had run a damp meter around about a week after installation when we redecorated the room. All was ok and the walls looked good. Nothing wrong with the ceiling or floor (apart from one annoying creaky floorboard!).
So it does seem a complete mystery, I’m thinking of bringing a medium in to check for ghosts!
 
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Was it the only room your decorated? What decorating did you do? Completing clutching at straws , it could be the damp from the decorating still?
 
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Was it the only room your decorated? What decorating did you do? Completing clutching at straws , it could be the damp from the decorating still?

decorating was basically filling a few areas around the windows where existing plaster had been chipped, a new bedroom door & frame, some skirting that had previously got bashed with furniture and hoovers and painting
.
 
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A gallon of water-based emulsion, containing nearly a gallon of water?

How long ago?

mid summer. Plus we have used the dehumidifier for several hours the other day. I doubt emulsion paint would be still hanging around, or at least I’d hope not!
 
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mid summer. Plus we have used the dehumidifier for several hours the other day. I doubt emulsion paint would be still hanging around, or at least I’d hope not!
Dehumidifiers cost money to run, ventilation is free.
 
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Dehumidifiers cost money to run, ventilation is free.

indeed they do, I only used it the other day to ensure the room was dry (based on what people had said in this thread), after several hours it barely collected a cup full, and this is a powerful one. Normally it is not often used, usually only when carpet cleaning in early spring.
 

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so where is the water coming from?

penetration round window, leak in roof, plumbing leak, drift from bathroom, rain down chimney

had it been raining?
 
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it may just be a case off the decorating has left excess moisture in the room so a period off heat then ventilation will drive out the extra moisture
 
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Is it the highest and has the most windows / cooler surface area in the house?
Could the warm / moist air be coming from downstairs and condensing there?
 

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