Damp in one room

FlorayG

Any ideas how to tackle this? Only one room in my house gets damp and it's clearly condensation, not anything serious.
It's the only North facing room and it's also the one I rent out to a lodger, so she keeps the door closed and eats her meals in there ( she doesn't have to) and does a lot of sleeping and breathing  . She doesn't dry clothes in there. It clearly IS the coldest room in the house and I let her use a supplementary oil-filled radiator because when the rest of the house is up to temperature and the central heating goes off it can still be a bit below comfortable, but the black patches that keep appearing in corners worry me. I already have forced air ventilation which keeps the rest of the house condensation free. Any suggestions other than tell her she must leave the door open ( not the best solution for her, obviously, she needs her privacy)?

tacpot12

A vent grille in the door combined with a trickle vent in her window would allow the forced air ventilation to ventilate her room better. Cheap ones won't have any ability to deaden sound which will be a concern for the lodger as it might affect their ability to get a good night's sleep. It's also not great from a privacy perspective. 

If you have a stud wall between the room and the hallway, you could fit grilles into the stud wall. By placing one in the hallway at the top of the wall, and the one in the room at the bottom of the wall, you will increase the distance the air has to travel and this will help deaden sound a little. (It won't do much unless you open the wall up and install some baffles into the wall. Additional noggins with lots of holes in might work, but the holes should not be aligned between noggins). 

Eldi_Dos

Can you fit a vent top and bottom of door so there is a airflow into and out of room.

Or in wall above door.

FlorayG

tacpot12 said:

A vent grille in the door combined with a trickle vent in her window would allow the forced air ventilation to ventilate her room better. Cheap ones won't have any ability to deaden sound which will be a concern for the lodger as it might affect their ability to get a good night's sleep. It's also not great from a privacy perspective. 

If you have a stud wall between the room and the hallway, you could fit grilles into the stud wall. By placing one in the hallway at the top of the wall, and the one in the room at the bottom of the wall, you will increase the distance the air has to travel and this will help deaden sound a little. (It won't do much unless you open the wall up and install some baffles into the wall. Additional noggins with lots of holes in might work, but the holes should not be aligned between noggins). 

Thank you for the idea @t@tacpot12
Where in the door? At the top or the bottom?
sadly no to the wall idea, her room door goes into the end of the hallway

EssexHebridean

Does the window have a trickle vent already? If not they really do make a difference - a level of ventilation without making a room feel cold.