Hi all - some advice /thoughts needed.
I have posted on here in the past about problems with my plastering/paintwork on one wall within the living room - which the consensus was efflorescence (Hope I got that right). So solutions were offered all of which started with "find the cause of the damp".
I have set out the situation below and would welcome advice/guidance on how to identify the source of the damp.
Thanks in advance.
The wall is externally facing stone built and about a foot and a half thick. The inside is plastered and painted. There is a window across a large portion of the wall with 2 stone mullions in it. There is an external door about 3/4 of the way across.
The damp problem (as I will call it) covers the length of the wall from the left hand side up as far as the door, but NOT on the small portion of wall to the right of the door.
It covers the inside facing of the wall in large patches, on the recess which house the windown and the gap between the window and the door.
It does not extend above the window, but in the gap between the window and the door it raises to about head height.
Possible causes of the damp I have considered:
1 - Leak from pipes above - however I have lifte floorbaords and all was dry - no apparent leaking pipe.
2 - Condensation from shower (Bathroom is at the top of the stairs which come down to the left hand side of this wall - thought damp air could be hitting the cold outside wall and causing the damp) however I have bought a decent sized dehumidifier and the problem has not alleviate. Also I would expect the problem to be as bad in teh bedroom directly above where the same situation would apply - it isn't.
3 - Rising damp (fits as it does not extend above the window) but there is a waterproof membrane built into the wall visible form outside.
4 - No ventilation in wall - No idea given the material and thickness of the wall if it as a cavity or not - the wall is very cold to touch.
I have posted on here in the past about problems with my plastering/paintwork on one wall within the living room - which the consensus was efflorescence (Hope I got that right). So solutions were offered all of which started with "find the cause of the damp".
I have set out the situation below and would welcome advice/guidance on how to identify the source of the damp.
Thanks in advance.
The wall is externally facing stone built and about a foot and a half thick. The inside is plastered and painted. There is a window across a large portion of the wall with 2 stone mullions in it. There is an external door about 3/4 of the way across.
The damp problem (as I will call it) covers the length of the wall from the left hand side up as far as the door, but NOT on the small portion of wall to the right of the door.
It covers the inside facing of the wall in large patches, on the recess which house the windown and the gap between the window and the door.
It does not extend above the window, but in the gap between the window and the door it raises to about head height.
Possible causes of the damp I have considered:
1 - Leak from pipes above - however I have lifte floorbaords and all was dry - no apparent leaking pipe.
2 - Condensation from shower (Bathroom is at the top of the stairs which come down to the left hand side of this wall - thought damp air could be hitting the cold outside wall and causing the damp) however I have bought a decent sized dehumidifier and the problem has not alleviate. Also I would expect the problem to be as bad in teh bedroom directly above where the same situation would apply - it isn't.
3 - Rising damp (fits as it does not extend above the window) but there is a waterproof membrane built into the wall visible form outside.
4 - No ventilation in wall - No idea given the material and thickness of the wall if it as a cavity or not - the wall is very cold to touch.