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subfloor
subfloor n.
Brit. 
/ˈsʌbflɔː/
, /ˈsʌbflɔː/U.S. /ˈsəbˌflɔr/
a floor or layer of flooring used as a base for another./ˈsəbˌflɔr/ΘΚΠ
society > inhabiting and dwelling > inhabited place > a building > parts of building > floor > [noun] > types of
parlour floor1441
causey1481
pediment1747
working floor1747
parquet1814
parquet floor1819
subfloor1838
straight-joint floor1842
parquet flooring1845
working floor1850
dallage1856
nightingale floor1914
open floor1932
floating floor1934
1838 Morning Chron. 26 Oct. 3/3 A sub-floor, covered on both sides with cement, was placed under the flooring of the upper portion of the building.
1929 W. C. Huntington Building Constr. vi. 264 This type of construction is greatly superior to that which rests the studs on a sole plate placed on top of the sub-floor.
2010 Ideal Home May 103/2 Carpets and ‘floating’ floors (laminate or engineered) that are not attached to the subfloor can be laid on any surface.
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