Damp Proofing

Where best to situate vents in room if condensation forming due to poor ventilation?

Anonymous user 09/03/2024 - 2.33 PM

I have pvc bay windows to the front (used as bedroom) that run with condensation in the winter even though I leave the 'upper' mid bay window on the latch to allow a tiny 1/2cm gap for air to circulate. Ventilation in adjoining room is non existent (no windows just patio door that gets left open occasionally during summer) so I believe it is defo due to poor circulation. I was thinking of putting some air bricks in bedroom walls near the bay - above floor level but unsure as to WHAT level. My thinking is a foot or so below ceiling height (as done in S.A.) as hot air rises.. but would it be better rather just above the floor level so as to circulate the air and not loose the warmth in the UK winters?? Or NOT to put in any at all ?? The plaster below the bay windows (even behind the rad that is there) 'streams' with dampness in winter and is getting full of black mould. It also appears to have blown away from the brick wall as it sounds hollow - (externally rendered which doesn't help either I guess - no cracks tho at least) due to this I think the internal plaster will need removing entirely and re plastering once aired, but still need to find the cause of it 'blowing' out. I've recently noticed the sealant around the windows outside has a few little gaps so will dig that out and reseal and am hoping that will resolve the dampness in the wall/plaster below the bay but cant see that that would cause the wet running DOWN the windows. Thanks for yr help :)