This is my first post (probably of many). We are in the process of buying a listed building that has been standing empty without any ventilation or heating for the last year. We are aware of evidence of some damp (as well as other problems) so we had a company in to provide an estimate for this & woodworm treatment. The estimate for the later seemed reasonable but I wasn't so impressed with their estimate for the damp. I spoke to the chap on the phone and he said that there were a couple of areas that had a problem and would need attention. Elsewhere they observed levels of damp that were commensurate with a building of this type (200 year old brick & stone). They suggested that depending on the scale of our refurbishment we should have the whole of the ground floor tanked at a cost of ~£10k. I appreciate that this is a significant undertaking and one that we would consider if we thought it were the right things to do. However, my thoughts are that we should really ascertain the point at which the moisture is getting into the house (potentially from above or cracks in the render / repointing etc). Surely tanking is just going to hide the symptoms and not fix the route cause?
Any advice would be appreciated.