Damp? In the bathroom

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jonnow87

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I’m not sure what is causing this issue. There is what seems to be damp to the side of the tiles above the door frame in the bathroom.

I’ve taken part of the plasterboard off each side and even been in the loft above to find any signs of water, but nothing! It’s dry every time.

I’ve painted over with BIN damp sealer and repainted but the stain has reappeared. It also seems visible behind the marble tile.

Pictures attached. The red arrow shows the direction of the feed for the shower head and the blue shows the stain/damp?
 

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Simple condensation from the cold tiles , need better ventilation , any extractor fan fitted ? Where?.
 
foxhole said:
Simple condensation from the cold tiles , need better ventilation , any extractor fan fitted ? Where?.
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There’s an extractor fan above the shower head that comes on with the light and stays on for period of time even when the light is switched off. Could there be anything I could add that you think would resolve this?
 
jonnow87 said:
There’s an extractor fan above the shower head that comes on with the light and stays on for period of time even when the light is switched off. Could there be anything I could add that you think would resolve this?
Click to expand...
More powerful fan, is there a shower screen?
 
Harry Bloomfield said:
Any extract fan, will need a similar matching size of hole, for air to enter the room. Often that will involve the door left open, or a suitable gap under the door.
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Would never recommend open door, defeats the object of a fan.You want the moist air outside not back into home.Warm shower room keeps the moisture airborne longer for fan to remove.
 
foxhole said:
Would never recommend open door, defeats the object of a fan.You want the moist air outside not back into home.Warm shower room keeps the moisture airborne longer for fan to remove.
Click to expand...

The extracted air, has to be sourced and replaced from outside the room.
 
foxhole said:
Very easily done thru the gaps in any door frame, not a fan on the market powerful enough to need more.
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Nonsense. You need at least 5 mm between the bottom of the door and the floor to allow enough airflow.

OP - does the fan hold a piece of toilet paper to the vent when on and the door closed ?

Also , never open a window, you need to draw dry air from inside the house

And finally, how long does the fan run on for after you turn off the light ?
 
Murdochcat said:
Nonsense. You need at least 5 mm between the bottom of the door and the floor to allow enough airflow.

OP - does the fan hold a piece of toilet paper to the vent when on and the door closed ?

Also , never open a window, you need to draw dry air from inside the house

And finally, how long does the fan run on for after you turn off the light ?
Click to expand...
Yes the fan holds a piece of toilet paper. The fan runs for roughly 16 minutes after the light is switched off.
 
Murdochcat said:
Nonsense. You need at least 5 mm between the bottom of the door and the floor to allow enough airflow.

OP - does the fan hold a piece of toilet paper to the vent when on and the door closed ?

Also , never open a window, you need to draw dry air from inside the house

And finally, how long does the fan run on for after you turn off the light ?
Click to expand...
Like I said everyone has a big enough gap round the door.
 
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