underlayment

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un·der·lay·ment

 (ŭn′dər-lā′mənt)
n.
See underlay1.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

underlayment

(ˌʌndəˈleɪmənt)
n
(Building) US a lower layer as under carpet or roofing tiles
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.underlayment - a pad placed under a carpetunderlayment - a pad placed under a carpet    
pad - a flat mass of soft material used for protection, stuffing, or comfort
underfelt - a carpet pad of thick felt
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Work done included fully recovering the principal roof, with modern sarking felt below French reed thatching, which was renewed at the time.
Instead, we line the underside with a black sheet material known as sarking felt.
Once the moisture is exposed to the cold underside of the sarking felt under the slates or tiles it can only mean one thing - condensation.
On older buildings which don't have sarking felt beneath the slates, a peep into the loft space without a torch will tell you where the slate has come from, as daylight will shine through.
The result of all of this extra humidity is a blue/grey bloom develops on the underside of the sarking felt and on the rafters.
Slate or tile roofs installed before the Second World War rarely had any sarking felt beneath the slates or tiles.