My flat has damp patches a metre up from floor level. There is no damp visible underneath it or above it. There are problems with the roof -chimneys aren't capped, pointing needs redoing and some flashing was redone badly some years ago- where there's likely to be a leak and we're trying to get someone to fix it. But builders who's been to have a look keep saying that it might be rising damp. Having that fixed is expensive so I'd like to ask how can I find out if it's rising damp or not before spending the money to fix it? I can fix the roof and let it dry and see but I'm wondering if there is a way of knowing if it's rising or descending damp in advance?