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Fascinating information but I suspect the most likely candidate is salts in the plasterboard.

Thank you but ventilation to the outside is a little difficult as this is a chimney breast in the middle of the house. but it appears to have been done, at least partially correctly, we just need to check the insulation at the bottom. The loft is well ventilated and condensation does not appear...

thank you, that's a very clear explanation. If, therefore, we are able to stop the warm air from the room entering the chimney, perhaps by sealing the chimney withj a plasterboard covered frame backed by solid insulation, is that likely to solve the problem?

Thank you, that certainly seems logical. I'll investigate that idea.

The first picture shows the top of the chimney which is below the roof ridge, I should have explained that more clearly. The house is a single storey cottage so the chimney is around 5m top to bottom. I should also have pointed out that this is an internal chimney breast. Luckily, the ground is...

Good Morning and thank you for allowing me to join te forum. I think I might be quite active over the next few weeks as I work to bring our new property, (soon we hope, our forever home) up to a comfortable standard. We live in the rural south of Scotland where installation services are scarce...

I've come to a much simpler conclusion. Use the windows.

I am currently renovating my Victorian home and have discovered in a number of areas that decisions are needed which are usually made by tradesmen based on their knowledge of regulations and regularly ignore science. For example, I am currently considering ventilation, ignored the regulations...

An Edwardian kitchen would probably have had an open, coal-fired range but I'm not considering fitting one of these either. There is a vast difference between a theme and the original.

Whereas the population of Bulgaria are all highly literate, well educated academics. The money to be made out of such a scheme is enormous bu it would make the box-tickers who complete Rd SAP EPCs redundant. It would also expose without mercy the horrific problems in our buillt environment which...

Thanks Roboughton, the positive air solution is one I had considered bt simple is good in my book. As for the logic behind the building regulations I would suggest the problem is an inability on the part of bureaucrats to think outside the box. Bulgaria has introduced an excellent system of...

It may come as some surprise but I had worked out that cooking produces moisture - around a pint a day according to scientific study, for a couple. In our house that would amount to approximately a 2-3% increase in humidity. There is also moisture from a dishwasher and a fridge to consider but...

We are in the process of designing a new interior for our kitchen. Luckily, we do not require a building warrant but we are concerned that we install effective ventilation rather than simply satisfying catch-all regulations. The room is split into two distinct areas with a 2.4m high opening...

Thanks for the offer, SandyLyon, we are a little north of you but actually in the south - of Scotland. I am interested to hear that an overlay system produces less heat, could this be because it does not embed the pipes in a screed? It is same problem I have with diffuser plates. Common sense...

We have a suspended floor in our Victorian villa. It is supported by 170 mm x 65 mm joists with a maximum 3m span and average 450 mm centres. The floor has been insulated using 170 mm of Icynene between the joists. We would like to lay our underfloor heating pipes directly into the existing...