Moisture protection

thumb|right|Waterproofing conducted on the exterior of a freeway tunnel

thumb|Tyvek house wrap Tyvek () is a brand of synthetic flashspun high-density polyethylene fibers. The name Tyvek is a registered trademark of the American multinational chemical company DuPont, which discovered and commercialized Tyvek in the late 1950s and early 1960s.

thumb|A tadelakt-covered wall

any material used to resist diffusion of moisture through walls, floors, ceilings, or roofs

physical separator between the conditioned and unconditioned environment of a building

thumb|right|Rainscreen cladding principle thumb|Air circulating scheme

overlapping layer; building element

presence of unwanted moisture in the structure of a building

construction material used to prevent the passage of water around objects

heavy-duty paper used in construction

measure of the passage of water vapor through a substance