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The reduction of the flow of heat; it is measured by thermal resistance.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
thermal insulation, heat insulation
A material providing high resistance to heat flow; usually made of mineral wool, cork, asbestos, foam glass, foamed plastic, diatomaceous earth, etc.; fabricated in the form of batts, blankets, blocks, boards, granular fill, and loose fill.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.