subfloor

[suhb-flawr, -flohr]
noun
a rough floor beneath a finished floor.
Also, subflooring.
Also called blind floor.


Origin:
sub- + floor

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Collins
World English Dictionary
subfloor (ˈsʌbˌflɔː)
 
n
a rough floor that forms a base for a finished floor

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
It should be bonded, not nailed, to the subfloor with latex-cement mortar.
It is nailed or screwed to the subfloor and joist and driven horizontally with
  a punch or nail set.
These are put together in sections on the subfloor and raised, barn-style, by
  two or more people with poles.
Both can eventually cause the floor framing and subfloor layer to flex or warp.
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