Hi,
I've got this patch on the inside of the house, on an external cavity wall. When we moved in the previous owner said it was down to lack of air circulation as they had a large bookcase in front of it.
We don't have a bookcase there but we have a desk. The patch was previously more extensive and higher up the wall, we have since painted over it and it has reappeared at the bottom of the wall only.
Any ideas what is causing this and how to get rid of it?
Thanks,
Dan
I've got this patch on the inside of the house, on an external cavity wall. When we moved in the previous owner said it was down to lack of air circulation as they had a large bookcase in front of it.
We don't have a bookcase there but we have a desk. The patch was previously more extensive and higher up the wall, we have since painted over it and it has reappeared at the bottom of the wall only.
Any ideas what is causing this and how to get rid of it?
Thanks,
Dan