air drain

air drain

[′er ‚drān]
(civil engineering)
An empty space left around the external foundation wall of a building to prevent the earth from lying against it and causing dampness.

air drain

An empty space left around the external foundation wall of a building to prevent the earth from lying against it and causing dampness.
References in periodicals archive ?
Their movement through the soil also helps water and air drain through the gaps they leave behind.
Cheap hollow-tined aerators cost from around pounds 15 while the best, such as the Sisis Air Drain Fork - as used by most professionals - costs around pounds 50.
Experts said Katesbridge endures colder nights than many other parts of Northern Ireland due to being in a sheltered spot and shallow valley into which cold air drains down and collects.
Contract Awarded for air drains to control rising damp