Ask the experts
Q My home has double-glazed uPVC windows, but they get black mould and mildew around the sealant. Do you know what is causing this, and are there any products that I could use to tackle it? Laura Harding, Cardiff
A Jill McLintock, Head of Product Marketing at Everest, explains…
Black mould or mildew around windows and doors can be caused by leaks. If this is the case, it is likely that the sealant and/or the frame is damaged and needs replacing.
However, in modern homes, even in those with new replacement windows and doors, the cause is more likely to be condensation. Over the years our houses have become more airtight. Double-glazed windows and doors are very energy efficient and, while they create rooms that are warmer, the water vapour created by normal living activities such as
