Building envelope
The roof, walls, windows, doors and below-grade assemblies separating interior and exterior conditions.
Waterproofing
A system intended to resist water passage under expected exposure.
Drainage plane
A concealed or exposed layer arranged to direct water outward.
Flashing
A durable water-shedding component at transitions and openings.
Membrane
A sheet- or liquid-applied layer used for water control.
Positive-side waterproofing
Waterproofing applied on the side exposed to water.
Negative-side waterproofing
Treatment applied from the opposite side of water pressure or entry.
Overburden
Pavers, soil, insulation, ballast or other materials placed above a membrane.
Efflorescence
Visible mineral deposits that may appear where water moves through masonry.
Controlled water test
A planned test using water to investigate leakage under defined conditions.