Wet Soil and Efflorescence
This is a common sign of a moisture issue in the crawl space. As the moisture comes through the brick, it leaves white chalky mineral deposits behind called efflorescence.
Before Encapsulation
Moisture comes from the ground and walls into the crawl space when left untreated.
After Encapsulation
With an encapsulation installed, this homeowner no longer has to worry about moisture rotting the wood, causing mold growth, or wood-boring insects being attracted by moist wood.
After Encapsulation 2
This is another example of the encapsulated space.