A damp mark rarely tells you what is happening behind the surface. In a busy commercial building, waiting until it becomes impossible to ignore can mean opening finished areas, rearranging contractors and revisiting planned works. Damp Proofing in Sunderland can form part of the answer, but first you need to understand the building and the moisture source properly and carefully. What can happen when damp is left to linger? With Damp Proofing Sunderland, the mistake is treatin