by Perry525 »
Sat Oct 19, 2013 3:14 pm
I assume that the room is on the ground floor and that there has been/is rising damp?
Opening a hole in a wall, will merely make the room cold and will do little to solve a rising damp problem.
When they inserted cream into the wall, they were installing a liquid damp proof course, even if it was done correctly it will take some time to dry as, as long as the wall is wet/damp it will attract water vapour from the air and will probably take until the middle of next summer to dry.
Your best bet is to buy some polystyrene foam and seal the holes that will be costing you a fortune over the coming winter as you will loose all the heat in your room through those holes, then when the holes are sealed buy a dehumidifier to soak up the water vapour.
Water vapour in a home comes from cooking, washing, drying things indoors, ironing, breathing, sweating. It will escape to the outside, if you open a window, as the outside is nearly always colder and drier than indoors. The problem is, it means your heat will disappear into the sky as well. That is why a dehumidifier is the best solution.