We live on the first and second floors of a converted house. There is one flat on the ground floor. We both own our flats although we currently hold the freehold for the whole building. We own the roof space but the roof is a shared responsibility.
We need to get the roof insulated. The roof is slate and will need replacing in the next five years or so, but in the meantime we wanted to get the insulation done.
As it will benefit the flat downstairs, is it reasonable to expect them to help pay with the costs?