It’s imperative that all cement laid must in the dry to set. Please ensure no roofer lays cement when it may rain, this would be a disaster as it would run down your building.
Ensure all your verges, ridge tiles and valleys all have the cement intact. Call a professional roofer to take a look for you and advise accordingly.
Seek professional roofing advice from Redman Roofing Ltd for a free no obligation quotation on 07733 265 827