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Moisture problems in exterior masonry walls can be caused by either water leakage or air infiltration-condensation, or a combination of both. However, because many symptoms of water leakage and air infiltration-condensation are similar, it's vital to investigate both, even when the problem seems to clearly indicate one or the other. A pronounced symptom of one may be overshadowing a symptom of another. For a balanced investigation of an exterior masonry wall system's moisture problem, you should:
Besides possibile leaks from the atmosphere and/or installations, the warm and humid air inside the buidlings penetrates into cold masonry and this causes condensation of humidity and therefore moisture
Leaking water lines either in walls or floor
BECAUSE OF DAMPING BY LEAKAGE AND IN WINTER MOISTURE IS ALSO A MAJOR CAUSE.
IT SHOULD BE BECAUSE OF TEMPERATURE VARIANCE BETWEEN INDOOR AND OUDOOR CONDITIONS, SIMPLY WE CAN CALLED AS CONDENSATION