Recently our house has been suffering from damp in one corner of the house, the strange thing is its upstairs and down. The damp is like a green fungus type stuff. In both rooms its at the bottom of the wall. I was told if its under 1.5m up the wall then its rising, otherwise its direct, any suggestions as to what could cause it? or what could be the solution? Pointing looks pretty shody but the downstairs wall is protected by a porch. Any help appreciated