Hi,
Looking for advice with a Hygroscopic salt(?) stain. It does not seem to get worse/larger but reappears after decorating (painting).
The facts:
Property is brick Victoria-era (mid 1880s)
There are no issues with flaking paintwork, white fluff/salt tide marks - just a reappearing stain. Affected area feels colder than surrounding area (this time of year)
The affected area of wall is between a bedroom and the old kitchen chimney. It is mid/top section of wall.
The stains are in the bedroom.
The chimney is only used for the kitchen/hob extractor fan which has a flue that is directed out of a vent (side of chimney). The bottom of the chimney is therefore effectively sealed. The chimney has a wide opening in the side which our range cooker sits in.
The original chimney was dropped so that the roof could be fully tiled. The lowered chimney is capped and has a black flue/breather (and cap) that stands taller than the roof. We are happy the roof, brickwork, etc is watertight
There is no other ventilation for the chimney.
After the chimney was dropped, we waited before decorating. The repainted walls seemed fine but the "stained" area slowly reappeared (over a couple of years)
My wife is currently redecorating and the repainted areas have soon shown the "stained" area. (Possibly not helped by to time of year - damp air, etc)
The solution: (the bit where I need help!!)
I had assumed it was to do with ventilation (or lack of) and was set to fit an air brick into the external face of the chimney. Is it worth installing one?
My neighbour has suggested it is hygroscopic salt and says the only way to resolve is affected plaster off.
Is this the only solution? Is there a way of treating the plastered wall to form a seal - as far as stopping the "stain"? I've done a quick Google and there seem to be salt neutralises and various paints but not sure if these are for adding to a plaster mix or maybe just gimmicks.
Not looking to cut corners but equally trying to avoid a big job where a smaller fix is possible.
Looking for advice with a Hygroscopic salt(?) stain. It does not seem to get worse/larger but reappears after decorating (painting).
The facts:
Property is brick Victoria-era (mid 1880s)
There are no issues with flaking paintwork, white fluff/salt tide marks - just a reappearing stain. Affected area feels colder than surrounding area (this time of year)
The affected area of wall is between a bedroom and the old kitchen chimney. It is mid/top section of wall.
The stains are in the bedroom.
The chimney is only used for the kitchen/hob extractor fan which has a flue that is directed out of a vent (side of chimney). The bottom of the chimney is therefore effectively sealed. The chimney has a wide opening in the side which our range cooker sits in.
The original chimney was dropped so that the roof could be fully tiled. The lowered chimney is capped and has a black flue/breather (and cap) that stands taller than the roof. We are happy the roof, brickwork, etc is watertight
There is no other ventilation for the chimney.
After the chimney was dropped, we waited before decorating. The repainted walls seemed fine but the "stained" area slowly reappeared (over a couple of years)
My wife is currently redecorating and the repainted areas have soon shown the "stained" area. (Possibly not helped by to time of year - damp air, etc)
The solution: (the bit where I need help!!)
I had assumed it was to do with ventilation (or lack of) and was set to fit an air brick into the external face of the chimney. Is it worth installing one?
My neighbour has suggested it is hygroscopic salt and says the only way to resolve is affected plaster off.
Is this the only solution? Is there a way of treating the plastered wall to form a seal - as far as stopping the "stain"? I've done a quick Google and there seem to be salt neutralises and various paints but not sure if these are for adding to a plaster mix or maybe just gimmicks.
Not looking to cut corners but equally trying to avoid a big job where a smaller fix is possible.
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