Hi guys, I've had this bungalow about 11 years, about 18 months ago we decided to completely renovate it prior to our second son coming, we did a lot of work including a re skim throughout. Now, this winter we've had an atack of these black spots! We've never really had them before, if any, very little! I've always been aware that they come because of the lack of air circulation etc, but we've done nothing different this year!? So I'm scratching my head a little! I'll try and post a pic