Monitor (architecture)

A monitor in architecture is a raised structure running along the ridge of a double-pitched roof, with its own roof running parallel with the main roof. The long sides of monitors usually contain clerestory windows or louvers to light or ventilate the area under the roof.[1] A monitor roof looks like the roof of a traditional sugar house (building for boiling down maple syrup) but the purpose of the sugar house roof is to vent steam. Also, some railroad passenger cars historically had monitor roofs.[2]


  1. Ching, Francis D.K. (2012). A Visual Dictionary of Architecture (2nd ed.). John Wiley & Sons, Inc. p. 217. ISBN 978-0-470-64885-8.
  2. Curl, James Stevens; Wilson, Susan (2016). Oxford Dictionary of Architecture. Oxford University Press. p. 496. ISBN 978-0-19-967499-2.

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