Hi Elchanco, I would like to tell you that damping in roof arises due to low water resistant capability of roof and existing walls. Damped condition for a prolonged period affects the overall sustainability of your roof and paint quoted on roof will break into pieces and will gradually fall on the floor. what I think now after reading your post that these condensation problem could be due to water tank on your roof as I guess you are living in a apartment where two flats share a common guttering pipe (as you told in your post that you and other house have shared guttering pipe) and in apartments you will find water tank installed on the roof surface most probably which should not be there actually. It should be installed ideally at a fair high position from the roof's surface.
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