ˈunderlayment U.S.
[f. underlay v. + -ment.]
Carpet underlay; material laid beneath roofing tiles, etc.
| 1956 Study of Installation Wood Block Finish Flooring (U.S. Nat. Res. Council) 17 The sub-floor should be covered with an underlayment of 15 lb. asphalt impregnated felt. 1975 ‘E. Lathen’ By Hook or by Crook x. 97 You'll be sure that the men have instructions about the underlayment. |