Hi All. We moved into an very old stone house last June and after a week or two noticed a few small damp/wet patches on the plastered and emulsioned bedroom wall along the line of the chimney breast. The chimney has the oil fired central heating flue running inside it. The wet patches continued to grow and are now many and Big!. Some have little brown stains in the middle, but no mold. We have had a roofer to renew flashings, tiles, cement around the base of chimney and a cap on the top, all to no avail. The gable end is very exposed to the weather but the pointing looks good. Attic area above is dry. I have since tried a dehumidifier on 24/7 heating on and off (but the radiator is on the opposit wall) Windows open/closed. No difference. The room is large and quite cold I am thinking of having the radiator relocated the chimney breast area...what do you think? Any suggestions greatfully recieved.