Related to Moisture impervious

Impervious surface means a surface that has been covered with a layer of material so that it is highly resistant to infiltration by water.
Pervious means any surface or material that allows the passage of water through the material and into the underlying soil.
Impervious area means any surface that does not allow stormwater to infiltrate into the ground.
Pervious surface means an area that releases as runoff a small portion of the precipitation that falls on it. Lawns, gardens, parks, forests or other similar vegetated areas are examples of surfaces that typically are pervious.
Infiltrative surface means designated interface where effluent moves from distribution media or a distribution product into treatment media or original soil. In standard trench or bed systems this will be the interface of the distribution media or product and in-situ soil. Two separate infiltrative surfaces will exist in a mound system and an unlined sand filter, one at the interface of the distribution media and fill sand, the other at the interface of the fill sand and in-situ soil.

Moisture impervious definition