Last winter I had problems with the RH being 80%+, using a dehumidifier the levels would go down to the 50% range but would go straight back up if I turned it off. Last night i noticed a area half way up the wall by the front door that was peeling away and there were salt like deposits on the plaster behind the paint. If this is the problem how would i go about fixing it/ locating the problem area. I have uploaded some images of the area to imgur, linked below.
Thanks.
http://imgur.com/a/u7ydV