Hi Gazman16. You posts inspired me to hack at my walls to try and finally solve my damp issues around my windows!. The window and sill doesnt seem to be sealed as you have previously suggested in other posts. Would you mind taking a look at my thread when you have a spare minute. Thank you https://www.diynot.com/diy/threads/damp-patches-in-bottom-corner-of-windows-problem-found-repair-advice.540994/