Acidic Soil
Soil pH is a measurement the alkalinity or acidity of soil. pH is measured on a scale of 1-14, with 7 as the neutral mark, anything below 7 considered acidic and anything above 7 considered alkaline.

Adhesion
Refers to the attraction between two molecules, each having regions of low level positive and negative charge.

Air-gap Membrane
A dimpled membrane, typically manufactured using a high density polyethylene, impermeable to water and water vapor, that creates an air gap between the membrane and a foundation wall. Water between the air-gap membrane and the foundation wall flows freely towards the weeping tile. It also provides a capillary break between the foundation wall and the saturated soil surrounding it.

Air Mop
The replacement of excavated earth into a trench around or against a basement or crawlspace foundation wall.

Basement Floor Slab
The 4 or 5 inch layer of concrete that forms the basement floor.

Basement Tuxedo