Hi all, Would really appreciate some advice here from the pro's, myself and some neighbours had our garage block re-roofed back this summer, they were felted before but had not been maintained for over 15 years, all the joists and decking boards had completely rotted and fallen through. We had it done this year, new timber joists, boards and three layer felt torch on fitted, however i have noticed inside the the underside of the new boards are dripping wet and covered in green mould. The neighbours garages are the same, but not as bad. The inside floor of all the garages were soaking wet before the new roof was fitted due to old collapsing and some even had trees growing inside them. Can someone shed some light on what has happened here or what should/could have been done to prevent this? I have taken some photos for you to see, The felt on top of garages doesn't have any obvious signs of damage and was done by a recommended company. Any help much appreciated.