I'm having some work done on my roof and after removing some of it they put tarpaulin (sp?) up, but it leaked after we had heavy rain last week and i'm wondering if it may have damaged our ceilings? How much water would it take to relly damage the ceilings and how can i find out if the ceilings need replacing? Also i discoered the leak as the water ws coming through one of the downlights. This worried me also, as i thought water and electrics were a very bad mix. Please help. Isa