Missing Concrete Vapor Barrier

What happens here

The mini shop's concrete slab was poured without a vapor barrier underneath. The host explains that this allows moisture from the ground to permeate the concrete, leading to dampness and potential issues inside the building. He strongly advises always installing a vapor barrier, regardless of whether the concrete is indoors or outdoors, to prevent moisture problems. He also mentions the issue of concrete heaving due to frost, caused by the lack of dowels and proper moisture control.

Goal: Always install a vapor barrier under concrete slabs to prevent moisture issues.