rat-trap bond
 n.— «The southern and western walls of the building, which face the sun during the day, have been built using a type of masonry called the rat-trap bond. Popularised by the iconic architect Laurie Baker who died last week, this is a special arrangement of bricks that leaves air gaps between walls. The two-layered construction prevents transmission of heat from the outer to the inner wall. It also saves on the use of bricks.» —“The coolest building in town” by Raghava M. in Karnataka The Hindu (India) Apr. 11, 2007. (source: Double-Tongued Dictionary)

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