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Damp either travels in horizontally (sort of) or rises. To stop it rising you must have a vertical DPC, this can be chemical as you know and inserted into an existing wall. To stop the vertical entry the outside render must not have any flaws. I wouldn't use a lime mix. I might take all the...

hi, very difficult to visulise, probably my fault not your discription. if you want to send me a sketch i will try and help. 2) first, never a godd idea to tis an inside wall to an outside wall as damp can travel in. 1)if you want to remove anything make sure it iis not supporting...

there are chemicals obtainable from builders merchants for this, one is 'disclean' . read instructions and followcarefully as this is a mild acid. never use a wire brush. unless the staining is really bad or in a sheltered position the weather and frost will clean the wall in time.