We have damp (black mound) in all the upstairs rooms in our house. We have double glazing throughout the house, which doesn’t appear to be leaking or drafty. The soffits and fascias are old, wooden and rotten. Do any of you lovely Wycombers know what’s causing the problem? If it’s the soffits and fascias could anyone recommend a company that would be able to fit replacements. Looking for companies that you’ve used yourself and they did the job properly. Thanks in advance!