Eventually the area will be covered with an impermeable barrier, soil, and finally grass.

Here, tight junctions fuse together to form an impermeable barrier to not only large molecules such as proteins, but also smaller molecules like water.

Separating certain materials from the display section of an exhibition case by lining relevant surfaces with an impermeable barrier film will help protect items from damage.

Gas and oil are lighter than water, so they will form a bubble at the high end of the trap formed by the impermeable barriers.

Similar uses include making slurry walls, waterproofing of below-grade walls, and forming other impermeable barriers, e.g., to seal off the annulus of a water well, to plug old wells.