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[uhn-der-ley-muh nt] /ˌʌn dərˈleɪ mənt/
material laid between a subfloor and a finish floor of linoleum, asphalt tile, etc.
Origin of underlayment
1945-50; underlay + -ment Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for underlayment
  • 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 caps.
  • underlayment--The roof and fascia panels shall be installed over underlayment.
  • Apply the metal drip edge directly over the underlayment along the rakes.
  • Apply thermal and moisture protection or synthetic underlayment over wood substrate or underlayment and install steel gutters.
  • Also, floor underlayment and sheathing papers are required for many remodeling projects.
  • Tiles shall be set to adhere fully and permanently to underlayment or backing.
  • The plans do not note which part of the floor gets hydraulic cement underlayment.

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