My house seems to be plagued with leaks. I have (I think) found the source of a leak and am in the process of trying to dry out a patch on the exterior wall. I have blowtorched the brick work but the patch comes back I guess I am drawing the moisture to the surface? I have even turned on the heating full blast in the bathroom (where the leak was) for 12 hours, the patch is still there. Are there any recommended ways to dry out a wall? The wall is a 2 bricks thick with no cavity and the patch is about 0.5m x 1 m.