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thick felt laid between floorboards and carpet to increase insulation and resilience
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
2. A padding material comprised of hair felt, or some combination of felt and jute, laid directly on the floor, over which carpet is installed; a type of underlayment.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.