half slating

open slating, spaced slating

open slating
In roofing, a slating pattern in which spaces are left between adjacent slates in a course.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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Ref Alan Muir incensed the Saints bench who spent the rest of the first half slating the fourth official and linesman - but it appeared a correct decision.