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What is "cavity wall"

Longman Dictionary of Contemporary English
cavity wall
noun
EXAMPLES FROM CORPUS
▪ As well as these weather-resisting advantages, the cavity wall has greater sound and thermal insulating properties and a greater resistance to overturning.
▪ His head jerked and banged against the cavity wall, then it did it again and after that, a third time.
▪ If you plan to have cavity wall insulation installed, start by approaching your local authority Building control Officer for approval.
▪ Incidentally, cavity wall insulation should be impermeable to water vapour, or interstitial condensation can occur.
▪ Other parts of the treatment involved the cavity wall ducts under the building and some internal work in the flats.
▪ The work will include cavity wall insulation, roof insulation, double glazing and installation of energy efficient heating systems.
Wiktionary
cavity wall

n. (context construction English) A double wall of masonry connected by an air space.

WordNet
cavity wall

n. a wall formed of two thicknesses of masonry with a space between them

Wikipedia
Cavity wall

Cavity walls consist of two 'skins' separated by a hollow space (cavity). The skins are commonly masonry such as brick or concrete block. Masonry is an absorbent material, and therefore will slowly draw rainwater or even humidity into the wall, as well as from the inside of the house as from outside. The cavity serves as a way to drain water back out through weep holes at the base of the wall system or above windows. The weep holes allow wind to create an air stream through the cavity and the stream removes evaporated water from the cavity to the outside. Usually weep holes are created by intentionally leaving several vertical joints, also open head joints, open about two meters apart at the base of in every story. Weep holes are also placed above windows to prevent dry rot of a wooden window frame. A cavity wall with masonry as both inner and outer skins is more commonly referred to as a double wythe masonry wall.

Usage examples of "cavity wall".

Sah'ot made it reach out and seize the cavity wall with diamond-tipped claws, then retract its tether from above.