material laid between a subfloor and a finish floor of linoleum, asphalt tile, etc.

1945–50; underlay + -ment

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Underlayment is under the roofing material and protects the sheathing from
  moisture damage.
Underlayment shall not be used directly over metal door jams or metal decks.
There shall be a modified self adhering underlayment under all metal coping
Underlayment--The roof and fascia panels shall be installed over underlayment.
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