Crawl Space Repair - White chalky stuff on the walls

Many people think that the white chalky stuff on the block walls is mold. Most of the time it is minerals that are in the water vapor as it seeps through the wall. The main thing it tells an inspector is that there is definitely a need to encapsulate the crawl space walls. There is no sense in laying a great floor vapor barrier if the walls will let that much water vapor in.