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Condensation & mould around windows, black spots...

Posted by Matt Jones, on
Hi I'm having trouble with condensation and black spots of damp in my home. Each morning there is an excessive amount of condensation on my bedroom window, often on the bathroom window and sometimes on the hallway windows as well. About a year ago I had 2 air bricks sealed up, 1 in each in two bedrooms that are above head height, the guy who did the work for me also commented that it appears as if air bricks visible from the outside of the house but not inside had previously been sealed before I bought the place. Having done some reading around it sounds like these are supposed to be ventilating the timber under the floor so im a little concerned that they may be causing problems (I've noticed some of the floorboards start to creak/feel a little bendy, especially just outside of the bathroom where there is generally more moisture in the air). One of the floorboards in a spare room is certainly rotten at one end, there is a black spot on the board next to it as well. The problem with the air bricks that are in the top corners of the bedrooms is that before they were sealed the rooms were freezing cold in winter, even with the vents sealed (I'm sure we all remember how cold it was in the winter of 12/13 that took months to end). I'm sure it's no coincidence that the condensation started around the same time as I had the air bricks sealed. If it's just condensation causing the damp on the walls I can kind of live with that, although I would prefer to have it fixed, but it's now the timber floors im most concerned about. I understand if it were to get serious it could be expensive to fix which is something i'd like to avoid if all it will take is having the bricks reopened? I have a dehumidifier which I run most evenings in winter and this will take the humidity to around 50% in the bedroom, but by morning it's around 80% to 85%. Any advice would be very much appreciated.
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