Line of damp on living room wall

There are a number of possibilities as to the cause of the problem. Take a look at the exterior ground levels and make sure they are not above the existing damp proof course, if you cannot identify the damp proof course a guide will be your internal floor level, the exterior ground should be approximately 150mm or 6 inches below the internal floor. Another possibility is the original damp course may have failed due to age, or movement. Older Properties have a slate damp proof course which can deteriorate and become ineffective . Thirdly check for any drains which may be blocked or leaking. I would suggest finding a local damp proofing contractor who will quickly identify the cause of the problem and provide you with a written quotation. Simply post the job on my builder and you will quickly resolve your issue. I hope this has been of some use Regards mark

Hi there without pictures or more info can not give and advice,would need to survey to see if there are any external issues or internal problems hanging washing in this area ect ? regards Joseph