Thanks Micks'r:Assuming you want this issue dealt with once and for all, answering the following q's in as much detail as possible will help to identify a permanent solution.
1. Is the black mould appearance seasonal? (i.e is it more pronounced during the heating season, for instance)
2. Where is it appearing and is there a "pattern"
3. What age and type of property?
4. How long have you had the property and has this been an issue from the start or just the current tenants?
Yes, this should work on a temporary basis and perhaps this is the type of solution the OP is looking for.Running a portable dehumidifier in the impacted rooms could be a solution. It has worked for me in the past.
You could buy the tenants one, but they would have to diligently use it and empty it.
I have seen a simple thing like changing from an open fire to a stove causing significant issues so I don't agree with your comment re "sauna like conditions"
True, PIV is another option.another alternative is positive input ventilation (PIV) which pulls fresh air into the attic and pumps it into the house (https://smartheat.ie/product/drimaster/ - not an endorsement, site just came up on Google). I'm pretty careful about ventilation and we have a dehumidifier in the room where we dry clothes, but we still get mould in some rooms, considering PIV as an option as I've seen it recommended in a number of places.
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